Saturday, January 09, 2021

One Planet Summit kickstarts year of crucial environment talks

The endangered Crowned Lemur. So far, efforts to protect
   
and restore nature on a global scale have failed spectacularly 

Martin Schutt dpa/AFP/F

Paris (AFP)

Global leaders will try to reignite international environmental diplomacy on Monday, with a biodiversity summit that launches a critical year for efforts to stem the devastating effects of global warming and species loss.

Momentum on climate and biodiversity stalled in 2020 as a result of the coronavirus pandemic, a health crisis that experts say illustrates the many diverse dangers of environmental destruction.

The One Planet Summit, a largely virtual event hosted by France in partnership with the United Nations and the World Bank, will include French President Emmanuel Macron, UN chief Antonio Guterres, German Chancellor Angela Merkel and EU chief Ursula Von der Leyen.

Organisers want to lay the groundwork for crunch UN biodiversity talks -- postponed because of the pandemic -- that are set to be held in China in October and will see nearly 200 nations attempt to thrash out new goals to preserve Earth's battered ecosystems.

France hopes next week's summit will bring together issues around climate and the protection of ecosystems, a source from the Elysee Palace told AFP, adding that along with global warming, preservation of biodiversity is "our collective life insurance".

So far, efforts to protect and restore nature on a global scale have failed spectacularly.

The planet is on the cusp of a mass extinction event in which species are disappearing at 100 to 1,000 times the normal "background" rate, most scientists agree.

The UN's science advisory panel for biodiversity warned in a landmark 2019 report that one million species face extinction, due mostly to habitat loss and over-exploitation.

Human activity, it concluded, had "severely degraded" three-quarters of ice-free land on the planet.

- 'Climate Emergency' -

The picture on climate change is just as dire.

Under the 2015 Paris deal, the world's nations vowed to cap global warming "well below" 2C, and 1.5C if possible.

With just over 1C of warming so far, the world has seen a crescendo of deadly droughts, heatwaves, flood-inducing rainfall, and super storms made more destructive by rising seas.

The European Union's climate monitoring service has said 2020 tied 2016 as the hottest year on record.

Guterres warned last month that nations were not doing enough to avoid devastating temperature rises and urged world leaders to declare a "climate emergency" in their countries.

The UN's next major climate summit, COP26, was also postponed because of the pandemic and is now due to be held in November.

Participants at Monday's talks are "ready to demonstrate that their commitments are leading to concrete actions to preserve and restore biodiversity, and to lead systemic transformations of economies", according to a summit statement.

Leaders will present initiatives on four themes -- the protection of terrestrial and marine ecosystems, agro-ecology, funding for biodiversity and the link between deforestation, species and human health.

Last October, the UN's biodiversity panel warned future pandemics will happen more often, kill more people and wreak even worse damage to the global economy than Covid-19 without a fundamental shift in how humans treat nature.

The summit will also launch the High Ambition Coalition -- a group of 45 countries led by Costa Rica, France and Britain -- which aims to secure a global agreement to protect at least 30 percent of the planet's land and oceans by 2030.

© 2021 AFP
I HAVE NO MOUTH AND I MUST SCREAM
Twitter permanently bans Donald Trump over Capitol violence

Twitter has permanently suspended President Donald Trump's account after the violence at the Capitol building. The company cited the risk of further incitement in its decision.

Twitter said Trump's account was suspended "due to the first of future incitement of violence"

Twitter has announced it is permanently suspending President Donald Trump's account following the Capitol violence.

Twitter said late on Friday night that it was banning Trump's account "due to the risk of further incitement of violence."
 

This is a breaking news story. More to follow.


UPDATED

 Twitter said Trump's account was suspended "due to the first of future incitement of violence"

Twitter has announced it is permanently suspending President Donald Trump's personal account, @realDonaldTrump, and the @TeamTrump campaign account following the Capitol violence.

Twitter said late on Friday night that it was banning Trump's account "due to the risk of further incitement of violence."
 

"In the context of horrific events this week, we made it clear on Wednesday that additional violations of the Twitter Rules would potentially result in this very course of action," Twitter said in a statement

Trump calls suspension a ban on free speech

Trump tried to bypass the ban on Friday night by tweeting from @POTUS, the official US government account for the country’s leader.

Trump took to the official @POTUS account to accuse Twitter of "trying to silence me."

"Twitter has gone further and further in banning free speech, and tonight, Twitter employees have coordinated with the Democrats and the Radical Left in removing my account from their platform, to silence me -- and YOU, the 75,000,000 great patriots who voted for me," he said.

The tweets were subsequently deleted as Twitter does not allow using another account to evade a suspension.

Twitter's decision comes hours after Trump gained access to his Twitter account after being temporarily suspended from the microblogging site on Thursday. The permanent ban keeps the president from using what was one of his most-common means of directly addressing the public and making policy as well as personal statements.

According to the Twitter statement, on Friday Trump tweeted:

"The 75,000,000 great American Patriots who voted for me, AMERICA FIRST, and MAKE AMERICA GREAT AGAIN, will have a GIANT VOICE long into the future. They will not be disrespected or treated unfairly in any way, shape or form!!!"

This was followed by another tweet, where he announced that he will not attend President-elect Joe Biden's inauguration.  

"To all of those who have asked, I will not be going to the Inauguration on January 20th."

Twitter said it is suspending the account, which had more than 88 million followers, over violation of its policy against the glorification of violence. 

"After assessing the language in these Tweets against our Glorification of Violence policy, we have determined that these Tweets are in violation of the Glorification of Violence Policy and the user @realDonaldTrump should be immediately permanently suspended from the service

Trump also banned on Facebook

Trump was also "indefinitely" banned from Facebook and its subsidiary Instagram on Thursday, with the pressure building on social media platforms to ban the outgoing president. 

The call follows Wednesday's US Capitol storming, which saw pro-Trump supporters disrupting a joint congressional session in Washington DC to confirm President-elect Joe Biden's 2020 election win.

Whether to address matters of diplomacy or scathing attacks on rivals, Trump has used social media as his bull-horn throughout his presidency. 

Social media continues purge

Google suspended alt-right social networking service, Parler, from its Play Store late on Friday evening over posts that could further fuel violence, according to reports by Politico and The New York Times.

The suspension comes as tech giant Apple also mulls a ban on Parler.

Apple has reportedly given Parler 24 hours to implement a plan to fully moderate its platform, failing which it could face an ouster from Apple's App Store.

According to BuzzFeed News, Apple wrote to Parler over complaints that the service had been used to plan and coordinate the Capitol storming.

Earlier on Friday, Twitter also permanently evicted former Trump aides Michael Flynn and Sidney Powell for pushing far-right conspiracy theories and QAnon's content.

"Given the renewed potential for violence surrounding this type of behavior in the coming days, we will permanently suspend accounts that are solely dedicated to sharing QAnon content," Twitter said.

Michael Flynn, Trump’s former national security adviser and Sidney Powell, an ex-Trump campaign lawyer, have both raised doubts over the president’s defeat. 

Reactions to ban

While many on Twitter celebrated the ban, Donald Trump, Jr., lashed out at Twitter over the suspension of his father's account, saying "free speech no longer exists" in the country.

He said Trump's account was banned while dictatorial regimes are allowed to have a presence on Twitter, "with no issue despite threatening genocide to entire countries."

Jason Miller — a senior adviser to Trump and the chief spokesperson for his 2016 presidential campaign — called Twitter "disgusting" in a tweet addressed to the platform's co-founder and CEO Jack Dorsey.


.@Twitter is disgusting. These people would rather empower a murderous, anti-Semitic terrorist than allow free speech for the duly-elected President of the United States and the 75M people who voted for him. They’re coming for you next...why do you love terrorists, @jack?
Twitter permanently suspends Trump's account

 "due to the risk of further incitement of violence"

Issued on: 09/01/2021 - 00:55
A photo illustration shows the suspended Twitter account of U.S. President Donald Trump on a smartphone at the White House briefing room in Washington, U.S., January 8, 2021. 
© REUTERS/Joshua Roberts

Text by: 
NEWS WIRES

Twitter Inc said on Friday that it has permanently suspended U.S. President Donald Trump's account due to the risk of further incitement of violence following the storming of the U.S. Capitol on Wednesday.

The suspension of Trump's account, which had more than 88 million followers, silences his primary megaphone days before the end of his term and follows years of debate about how social media companies should moderate the accounts of powerful global leaders.

"After close review of recent Tweets from the @realDonaldTrump account and the context around them we have permanently suspended the account due to the risk of further incitement of violence," the company said in a tweet.

It was the first time Twitter has banned a head of state, the company confirmed.

Social media companies have moved swiftly to crack down on Trump and some of his prominent right-wing allies and supporters in the wake of the turmoil in Washington, D.C., on Wednesday, which led to five deaths.

Trump has repeatedly used Twitter and other platforms to claim his defeat in the Nov. 3 election was due to widespread voter fraud and to share other conspiracy theories, and had urged supporters to come to Washington on Wednesday and march on the Capitol to protest the election result.

Facebook Inc said earlier this week it was suspending his account through until at least the end of his presidential term.

The Republican president is due to hand over to Democratic President-elect Joe Biden on Jan. 20.

In a blog post on Friday, Twitter said that two of the president's tweets posted that day were in violation of its policy against the glorification of violence.

Twitter had temporarily blocked Trump's account on Wednesday following the siege of Capitol Hill, and warned that additional violations by the president's accounts would result in a permanent suspension.

Trump was required to delete three rule-breaking tweets before his account was unblocked. He returned to Twitter on Thursday with a video acknowledging that Biden would be the next U.S. president.

Twitter said that Trump's tweet that he would not be attending Biden's inauguration was being received by a number of his supporters as confirmation that the November election was not legitimate.

It said another tweet praising "American Patriots" and saying his supporters "will not be disrespected or treated unfairly in any way, shape or form!!!" could be seen as "further indication that President Trump does not plan to facilitate an orderly transition."

Critics of major social media platforms, including top Democratic politicians, praised Twitter's move and said it was long overdue, while Trump suppporters expressed outrage.

The president's son, Donald Trump Jr., in a tweet on Friday decried the ban, saying dictators who had threatened genocide continued to have Twitter accounts. He did not provide names.

The White House had no immediate direct comment. The Trump campaign's Twitter account criticized the company for "silencing" the president of the United States.

Using the @POTUS account, Trump said he would look at building his own platform.

'Looting and shooting'

Trump's prolific use of social media helped propel him to the White House in 2016. He has used his personal @realDonaldTrump account, which has sometimes tweeted more than 100 times a day, to reach supporters, spread misinformation and even fire staff.

In a 2017 interview on Fox Business, Trump said "I doubt I would be here if it weren’t for social media, to be honest with you," according to a transcript released by the network.

Both Twitter and Facebook have long afforded Trump special privileges as a world leader, saying that tweets that may violate the company's policies would not be removed because they were in the public interest. They said he would lose access to those privileges upon leaving office, however.

Twitter last year started labeling and putting warnings on Trump's tweets that broke its rules against glorifying violence, manipulated media or sharing potentially misleading information about voting processes.

In May, Twitter affixed a warning label to a Trump tweet about widespread anti-racism protests over the police killing of George Floyd that included the phrase "when the looting starts, the shooting starts." Facebook, which has come under fire from employees and lawmakers for not doing more about Trump's inflammatory posts, declined to act on the same message.

Trump still has access to the official @WhiteHouse and @POTUS accounts but will lose this when his presidential term ends. Asked if Trump could create another account, a Twitter spokeswoman said if the company had reason to believe he was using accounts to evade Friday's suspension, those accounts too could be suspended.

(REUTERS)

Twitter boots Trump to stop violence-sparking 

tweets

Issued on: 09/01/2021 - 

  

This screen grab shows the suspended Twitter account of 

US President Donald Trump on January 8, 2021 - TWITTER/AFP

San Francisco (AFP)

Twitter shut down President Donald Trump's account Friday, booting him from the global service to prevent another attack on the US Capitol building.

Trump had fervently used @realDonaldTrump for proclamations, accusations and misinformation unchallenged for his entire time in office.

Twitter' decision to permanently suspend Trump is considered overdue by critics who argue he has gotten away with abuses, but has inflamed members of the far-right who equate fact-checking with stifling free speech.

"After close review of recent Tweets from the @realDonaldTrump account," Twitter said in a blog post explaining its decision, "we have permanently suspended the account due to the risk of further incitement of violence."

Twitter late Friday blocked efforts by Trump to sidestep the ban.

He fired off tweets from the official presidential account @POTUS, accusing the company of conspiring with the "Radical Left." The social network quickly deleted the tweets.

Trump also tweeted from the @TeamTrump campaign account, which was soon suspended.

"Using another account to try to evade a suspension is against our rules," Twitter told AFP.

"We have taken steps to enforce this with regard to recent Tweets from the @POTUS account."

Twitter blocked Trump temporarily after the deadly attack on the US Capitol Wednesday, warning the suspension could become permanent.

He was suspended Friday after a pair of tweets: in one, Trump vowed that none of his supporters would be "disrespected." In another, he said he would not attend successor Joe Biden's inauguration on January 20, as is customary.

"These two Tweets must be read in the context of broader events in the country and the ways in which the President's statements can be mobilized by different audiences, including to incite violence, as well as in the context of the pattern of behavior from this account in recent weeks," Twitter said.

"We understand the desire to permanently suspend him now," said ACLU senior legislative counsel Kate Ruane.

"But, it should concern everyone when companies like Facebook and Twitter wield the unchecked power to remove people from platforms that have become indispensable for the speech of billions."

Trump has a press team and can easily turn to sympathetic outlets such as Fox News, while other people who could be shut out by the social networks don't have that luxury, Ruane noted.

Social media companies such as Twitter have the right to decide what appears on their platforms and set standards for appropriate content. The First Amendment right to free speech prevents governments from stifling expression and does not apply to private businesses.

- Talk of new attack -

Twitter said it also factored in that plans for more armed protests have been proliferating on and off the service, including a proposed second attack on the US Capitol and state capitol buildings on January 17.

Trump's tweeted statement about not attending the Inauguration has been received by some supporters as his continued rejection of the election's legitimacy and a sign that the event would be a "safe target" since he won't be there, according to Twitter.

Supporters also viewed the tweets' wording as praise for those involved in what has been described as a coup attempt and indication he does not plan to yield power to President-elect Biden, Twitter said in the post.

"We are living Orwell's 1984," Donald Trump Jr. tweeted from his account. "This is absolute insanity!"

- Fact-check fury -

Trump, who at 81.7 million followers had one of Twitter's 10 most popular accounts, preferred using the platform to get out his message without submitting himself to questions from reporters.

But the US leader has been at war with his favored social media platform since the presidential election, after Twitter took the unprecedented decision to fact-check some of his tweets.

Twitter confirmed Friday that several hundred employees signed a letter to chief executive Jack Dorsey saying they were disturbed by the "insurrection" carried out by Trump supporters, who had been rallied by the president.

The employees called for Twitter to assess the role its platform played in Wednesday's events.

- QAnon purge -

Twitter also removed the accounts of Michael Flynn and other high-profile Trump supporters who promoted the QAnon conspiracy theory.

"The accounts have been suspended in line with our policy on Coordinated Harmful Activity," Twitter told AFP.

"Given the renewed potential for violence surrounding this type of behavior in the coming days, we will permanently suspend accounts that are solely dedicated to sharing QAnon content."

Flynn has met with Trump at the White House to collaborate about how to overturn the presidential election results.

Facebook also has banned Trump from the platform "indefinitely" due to his efforts to incite violence at the US Capitol, according to chief executive Mark Zuckerberg.

Zuckerberg said a one-day ban imposed on Trump's accounts on Facebook and Instagram was extended because of Trump's "use of our platform to incite violent insurrection against a democratically elected government."

The announcement came after the outgoing president was locked out of all major social media platforms due to his false claims about the legitimacy of his loss to Biden, and for inciting the angry mob that stormed the US Capitol.
Google pulls 'free-speech' app Parler for 'egregious content'

Issued on: 09/01/2021 -
Google pulls Parler from app shop for 'egregious content'. 
© Olivier DOULIERY AFP/Archivos

Text by: NEWS WIRES


Google said Friday it had pulled the Parler app from its mobile store for allowing "egregious content" that could incite deadly violence like that seen at the US Capitol.

The Parler social network has become a haven for far-right personalities who say they have been censored by other social media platforms.

"We're aware of continued posting in the Parler app that seeks to incite ongoing violence in the US," Google said in a response to an AFP inquiry.

"For us to distribute an app through Google Play, we do require that apps implement robust moderation for egregious content," the company added, referring to its shop for digital content tailored for Android-powered devices.

Policies and enforcement practices that curb posts inciting violence are agreed to by app developers whose software is made available at Google Play, according to the Silicon Valley internet titan.

"In light of this ongoing and urgent public safety threat, we are suspending the app's listings from the Play Store until it addresses these issues," Google said.

Apple has reportedly warned Parler that its software could be removed from the App Store if it doesn't take measures to prevent users from planning illegal, violent activities on the platform such as the deadly attack in Washington.

Conservatives backing President Donald Trump's claims of election malfeasance have sparked a migration to alternative social media sites that have refrained from filtering unverified claims.

The shift has boosted right-wing favorites like Parler, Newsmax and Rumble, which have rejected Facebook and Twitter's approach of labeling and limiting the reach of conspiracy theories.

Facebook and Twitter banned Trump accounts Friday due to fear he would use them to instigate another attack such as the one in the nation's capital on Wednesday.

Sites like Parler have attracted Republican lawmakers as well as the Trump campaign.

As they have become increasingly important to the political conversation, Twitter and Facebook have struggled with manipulation and misinformation, while at the same time seeking to keep their platforms open to a variety of viewpoints.

Parler and similar sites have become a magnet for racist and anti-Semitic tropes along with groups that have been banned from other platforms for posting hateful content or promoting violence.

(AFP)

Q&A: ‘We need to reduce the ‘embodied energy’ of buildings

Retrofitting Europe’s buildings for energy efficiency is not enough to slash the carbon footprint of the construction sector and cut emissions in time to meet the Paris climate agreement goals, according to Dr Catherine De Wolf, assistant professor of design and construction management at TU Delft in the Netherlands.

She says that we need to design buildings to make them recyclable – but doing this will require a fundamental restructure of the construction industry.

How important is it to ‘green’ the construction industry?

The building sector is responsible for more than a third of our greenhouse gas emissions, and more than a third of our waste … and is one of the most resource-depleting industries.

That’s three good reasons for us to think about how to construct buildings in a more sustainable way.

And how urgent is it, given the rate at which emissions must be cut to meet the Paris climate agreement goal

Europe has set a target of net zero emissions in the construction and buildings sector by 2050. It is a huge ambition. If we don’t change the sector in the next five years we won’t be able to achieve that target.

There has been a lot of innovation in reducing the energy we need to heat and cool buildings – the ‘operational energy’. But we also need to reduce the ‘embodied energy’ of buildings, which is related to production, construction, demolition and maintenance.

We need to shift from a linear model to a circular model where we use as little new material as possible, and (instead) we reuse, repair and recycle.

Can you give examples of what this might look like?

One of the things that makes demolition attractive is it is very quick … we just wreck everything and send it to landfill. But to go towards a circular construction industry, we want to be deconstructing buildings (and reusing the materials). This takes more time and often more expertise.

We’re exploring robots in our research. If we can find ways to program robots to carefully disassemble building elements, potentially it could be done quicker than humans because they could work 24/7 in an automated way.

We still need the human expertise, and we still need to design for deconstruction so building materials are not glued together and cast together in a way that makes it hard to take them apart.

There’s a lot of innovation (still) to do in designing buildings that can be quickly disassembled.

And there are already a lot of startups in the reuse sector – they train people who are specialised in recognising which materials are valuable on the market, and how to remove materials without breaking them.

But (robots) can be one of the solutions.

  
The construction industry needs to move to a model in which it uses 
as little new material as possible and instead reuses, repairs and recycles,
 says Dr Catherine De Wolf. Image credit – Paul Barendreegt Fotografie

How much material is currently reused from old buildings?

(Construction companies) take away only about 1% of building materials from a demolition site for reuse, because the market isn’t in place yet.

If there was more demand and more actors involved, we could (reuse) more materials from buildings.

(In the meantime) you can reuse buildings as a whole by keeping the structure in place and putting a more flexible infill into them. For example, introducing movable wall partitions allows an office to be reconfigured quickly and cheaply in the future.

What needs to happen for us to achieve circular construction?

We will need to completely review the whole supply chain in the building sector.

Building users and owners, architects, engineers, contractors, materials suppliers … (and) governments need to work together towards this transition.

At TU Delft we are looking at how digitalisation can help put stakeholders in contact with each other so they can exchange materials and reuse them, rather than throwing them away.

(We) are exploring AI technology to make digital platforms for exchanging materials more efficient.

‘We still need to design for deconstruction so building materials are not glued together and cast together in a way that makes it hard to take them apart.’

-Dr Catherine De Wolf, TU Delft, the Netherlands

What’s holding back the shift to a circular economy?

There’s a strong concrete and steel lobby in the construction industry that is definitely playing a role.

But it’s also about how fragmented the construction industry is. There are so many contractors and subcontractors, so communication between stakeholders is quite difficult.

The construction sector in general is quite slow in the uptake of innovation – especially digital innovation – compared to other sectors, and I think this is because of how fragmented the value chain is.

Can the construction industry really become circular within 5 years?

Yes I think so. It’s already shifting towards circular construction. And there’s a lot we can do to accelerate the transition.

For example, currently some building materials are quite cheap. We don’t pay for their environmental impact, or the impact of waste on the environment and on society. Carbon and waste taxes could help address that.

The public sector can play a big role through changing building regulations and through public procurement.

Also, we need to start assessing the price of a building based on its long-term lifecycle cost, and the cost of waste and emissions.

Is the shift to a circular economy the most important change?

We should go beyond circular construction and talk about regenerative construction.

That means designing buildings that improve the environment rather than harming it. For example, as well as reusing materials, use materials with carbon sequestration, use (biological-based technology to) treat wastewater from the building, grow vegetables on the roof.

A building is a complex entity so it should be looked at holistically.

Dr De Wolf has received EU funding under the EPFL Fellows project.

Rock Magnetism Uncrumples The Himalayas’ Complex Collision Zone

January 8, 2021 MIT

MIT EAPS researchers find the impressive mountain range formed over a series of impacts, not a single event, as previously thought.


With some of the world’s tallest peaks, Asia’s “the abode of snow” region is a magnet for thrill seekers, worshipers, and scientists alike. The imposing 1,400-mile Himalayan mountain range that separates the plains of the Indian subcontinent from the Tibetan Plateau is the scene of an epic continent-continent collision that took place millions of years ago and changed the Earth, affecting its climate and weather patterns. The question of how the Indian and Eurasian tectonic plates collided, and the mountains came into existence, is one that scientists are still unfolding. Now, new research published in PNAS and led by MIT’s Department of Earth, Atmospheric and Planetary Sciences (EAPS) confirms that it’s more complicated than previously thought.


“The Himalayas are the textbook example of a continent-continent collision and an excellent laboratory for studying mountain-building events and tectonics,” says EAPS graduate student Craig Martin, the paper’s lead author.

The story begins around 135 million years ago, when the Neotethys Ocean separated the tectonic plates of India and Eurasia by 4,000 miles. The common view of geologists is that the Neotethys Ocean plate began subducting into Earth’s mantle under Eurasia, on its southern border, pulling India north and the tectonic plates above it together to ultimately form the Himalayas in a single collision event around 55-50 million years ago. However, geologic evidence suggested that the high rate of subduction observed didn’t seem to quite fit this hypothesis, and model reconstructions place the continental plates thousands of kilometers apart at the time of this inferred collision. To account for the time delay and subduction strength required, MIT’s Oliver Jagoutz, associate professor of geology, and Leigh “Wiki” Royden, the Cecil and Ida Green Professor of Geology and Geophysics, proposed that because of the high speed, orientation, and location of the final continental collision, there needed to be another oceanic plate and subduction zone in the middle of the ocean, called the Kshiroda plate and the Trans-Tethyan subduction zone (TTSZ), which ran east to west. Additionally, EAPS geologists and others postulated that an arc of volcanic islands, like the Marianas, existed in between the two, called the Kohistan-Ladakh arc. Located near the equator, they took the brunt of the force from India before being squished between the two continental crusts.

Tiny magnets point the way

This chain of events, its timing and geological configuration, was speculation based on models and some geological evidence until EAPS researchers tested it — but first, they needed rocks. Along with professor of planetary sciences Ben Weiss of the MIT Paleomagnetism Laboratory, Martin, Jagoutz, Royden, and their colleagues visited northwest India’s Ladakh region, bordering the Eurasian plate. Over multiple excursions, the team, which included EAPS undergraduate Jade Fischer for one trip, scrambled over outcrops and drilled rock cores, slightly larger than the size of a cork. As they pulled them out, the geologists and paleomagnetism experts marked the samples’ orientation in the rock layer and its location in order to determine when and where on Earth the rock was formed. The team was looking for evidence showing whether a volcano, which was active around 66-61 million years ago, was part of a volcanic island chain in the ocean south of Eurasia, or part of the Eurasian continent. This would also help determine the plausibility of a double subduction zone scenario.

Back in the lab, the MIT researchers used rock dating and paleomagnetism to understand this ancient geologic car crash. They leveraged the fact that, as lava cools and rock forms, it captures a signature of the Earth’s magnetic field, which runs north-south toward Earth’s magnetic poles. If rock forms near the equator, the magnetization (electron) spins in its iron-bearing minerals, like magnetite and hematite, will be oriented parallel to the ground. As you move further away from the equator, the rock’s magnetization will tip into the Earth; however subsequent heating and remagnetization can print over the original signature.

After checking for this, and correcting for the tilt of the bedrock at the site, Martin and his colleagues were able to pinpoint the latitude at which the rocks were created. Uranium-lead dating of the samples’ zircon minerals provided the other piece of the puzzle to constrain the timing of formation. If there was a single collision, these rocks would have formed at a latitude somewhere around 20 degrees north, above the equator, near Eurasia; if the islands existed, they would have originated near the equator.

“It’s cool that we can reconstruct the deep-time atlas of the world using the tiny magnets preserved in rocks,” says Martin.

A two-part system

With their time and latitudinal measurements and models, the MIT researchers found the evidence they were looking for — the presence of an island chain and double subduction system. From 80 to likely 55-50 million years ago, the Neotethys Ocean was subducted in two locations: along the Eurasian plate’s southern edge (the Kshiroda plate sank) and the mid-ocean TTSZ, just south of the Kshiroda plate and near the equator. Together, these events closed the ocean, and the tectonic activity worked with erosion and weathering to sequester and draw down carbon, until the Paleocene Epoch (66-23.03 million years ago). “The presence of two subduction zones and the timing of their destruction at low latitudes explains the cooling global climate in the Cenozoic (66 million years ago to present day),” says Martin.

Most importantly: “Our results mean that instead of India colliding directly with Eurasia to form the Himalayas, India first collided with a volcanic island chain (similar to the Mariana Islands today), and then with Eurasia up to 10 million years later than is generally accepted,” says Martin. This is because Kohistan-Ladakh arc and India collision slowed the India-Eurasia convergence rate, which kept decreasing until 45-40 million years ago when the final collision occurred. “This finding is contrary to the long-held view that the India-Eurasia collision was a single-stage event that started at 55-60 million years ago,” says Martin. “Our results strongly support Oli and Wiki’s double subduction hypothesis explaining why India moved north so anomalously fast in the Cretaceous period.”

Further, Martin, Jagoutz, Royden, and Weiss were able to determine the maximum extent of the Indian plate before it was forced under Eurasia. The convergence between India and Eurasia since 50-55 million years ago was around 2,800-3,600 kilometers. Much of this is explained by the subduction of the Kshiroda plate, which the MIT researchers estimated to be roughly 1,450 kilometers wide, at the time of the first collision with the island arc, 55-50 million years ago. After the first stage of collision between the island chain and India, the Kshiroda plate continued to disappear underneath Eurasia. Then, 15-10 million years later, as the two continents came together, the continental crust began shortening, folding, and thrusting rocks upward, the force of which caused observable changes to the composition and structure of the rocks. “Our results also directly constrain the size of the part of India ‘lost’ in the collision to less than 900 kilometers in the north-south direction, which is much less than the 2,000 kilometers previously required to explain the timing of collision.”

The newly-gained insights into the mechanisms and geometry of such an archetypal mountain system have important implications for using the Himalayas to study continental collision, says Martin. Revising the number of subduction zones, the age of final collision, and the amount of continental crust involved in the formation of the Himalayas changes some key parameters required to accurately model the growth of mountain belts, the deformation of continental crust, and the relationships between plate tectonics and global climate.

Martin hopes to take this further throughout the rest of his graduate studies by focusing in on the intensely deformed collision zone between the volcanic island chain and Eurasia. He hopes to understand the closure of the Kshiroda ocean and the geological structures produced during the continental collision.

Not only is the finding impressive, but as Martin remarks, “I think it is cool to imagine idyllic tropical volcanic islands, with dinosaurs roaming around on them, having been sandwiched between two colliding tectonic plates and uplifted to form the roof of the world.”

This study was funded, in part, by NSF Tectonics Program and MI