Sudbury And The Dinosaurs

So all those minerals that abound in Sudbury, in particular nickel, were the result of an asteroid impact, in fact a result of 298 Baptistina. The asteroid credited with wiping out the dinosaurs.

Physical and chemical evidence of the 1850 Ma Sudbury impact event in the Baraga Group, Michigan

Peir K. Pufahl, Acadia University, Earth and Environmental Science, Wolfville, Nova Scotia B4P 2R6, Canada; et al. Pages 827-830.

A catastrophic extraterrestrial impact 1850 million years ago produced the Sudbury crater, the second largest known impact site on Earth. Pufahl et al.’s discovery of debris in northern Michigan, USA, produced from this impact has provided new information regarding the nature of this event. A prominent iridium anomaly in impact-generated tsunami deposits containing shocked quartz, spherules, tektites, and accretionary lapilli demonstrate that the extraterrestrial body was a meteorite and not a comet, as previously proposed. The Sudbury event was larger than those responsible for later major extinction events, and may prove important in the evolution of early life on Earth.

Two of the three largest impact craters on Earth have nearly the same size and structure, researchers say, but one was caused by a comet while the other was caused by an asteroid. These surprising results could have implications for where scientists might look for evidence of primitive life on Mars.

Susan Kieffer of the University of Illinois at Urbana-Champaign, Kevin Pope of Geo Eco Arc Research and Doreen Ames of Natural Resources Canada analyzed the structure and stratigraphy of the 65 million-year-old Chicxulub crater in Mexico and the 1.8 billion-year-old Sudbury crater in Canada.

Chicxulub is well preserved, but buried, and can be studied only by geophysical means, remote sensing and at a few distant sites on land where some ejecta is preserved. In contrast, Sudbury has experienced up to 4-6 kilometers of erosion, and is well exposed and highly studied by mining exploration companies because of its rich mineral resources.

RIO DE JANEIRO, Brazil, June 21, 2007 /PRNewswire-FirstCall via COMTEX/ -- Companhia Vale do Rio Doce (CVRD) announces that exploration drilling at Creighton, a more than century-old nickel mine near Sudbury, province of Ontario, Canada, is confirming mineralization at depth that has the potential to extend the mine life well into the future and continue its longstanding economic contribution to its wholly-owned subsidiary, CVRD Inco Ltd. (CVRD Inco) Ontario operations.

The Creighton Deep Project, a deep mine exploration program, has the potential to almost double the proven and probable reserves at Creighton from 17 million metric tons grading 3.1% nickel and 2.5% copper to up to 32 million metric tons grading 1.9 to 2.2% nickel and 2 to 2.3% copper.

In operation since 1901, Creighton has delivered a total of 173 million metric tons over its life with an average grade of 1.52% nickel and 1.22% of copper.

Exploration and advanced exploration diamond drilling have shown significant high-grade nickel, copper and platinum group elements (PGE) mineralization between the 2,150 and 3,200 meter levels at the mine.

The exploration program continues, and three exploration stations located 1.5 kilometers have been constructed to support further economic study of the findings to date. These latest stations are excavated further into the footwall beyond current infrastructure, allowing exploration to the 3,200- meter level across the entire strike length of all ore bodies.

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298 Baptistina

The more important discovery of a particular asteroid hitting earth, and wiping out the dinosaurs, which is how the MSM covered it, is the final two paragraph's.

IT WAS once suggested, to illustrate the chaotic and unpredictable way in which natural systems behave, that the beat of a butterfly's wing in China could eventually trigger a hurricane in the Atlantic. A bit of an exaggeration, perhaps, but the point was that even in the theoretically deterministic world of Newtonian mechanics, only a small amount of complexity is needed to make practical prediction well nigh impossible.

Thus it is perhaps not as far-fetched as it sounds to suggest that the collision 160m years ago of two space rocks, albeit quite large ones, resulted in the stormy death almost 100m years later of the dinosaurs and many other species on Earth. For although the orbits of the planets look to astronomers like a model of regular, Newtonian clockwork, on a scale of millions of years, the solar system is every bit as chaotic as the Earth's weather.

Around 65 million years ago, one 10-kilometre-wide piece crunched into Earth, unleashing a firestorm and kicking up clouds of dust that filtered out sunlight. In this enduring winter, much vegetation was wiped out and the species that depended on them also became extinct. Only those animals that could cope with the new challenge.

The trace of the great event, called the Cretaceous/Tertiary (or K-T) extinction event, can be seen today in the shape of a 180-kilometre-diameter impact crater at modern-day Chicxulub, in Mexico's Yucatan peninsula.

The trio of researchers – William Bottke and David Nesvorny of Southwest Research Institute in Colorado, U.S. and David Vokrouhlicky of the Czech Republic's Charles University in Prague – took their theory a stage further and checked out sediment samples from the Chicxulub site. They found traces of a mineral called carbonaceous chondrite, which is only found in a tiny minority of meteorites, as the Earthly remains of plummeting asteroids are called. Most asteroids can be excluded from the Chicxulub event, but not Baptistina-era ones, they contend.

Putting simulation and chemical evidence together, the team rule out theories that a comet was to blame rather than an asteroid, and say there is a "more than 90 per cent" probability that the killer rock was a refugee from the Baptistina family.

The investigators also argue that there's a 70 per cent chance that a four-kilometre-wide Baptistina asteroid hit the Moon some around 108 million years ago, forming the 85-kilometre crater Tycho.

An important point raised by the study "is how severe the repercussions of cataclysmic collisions in the asteroid belt can be for the Earth–Moon system," commented geologists Philippe Claeys and Steven Goderis of Vrije University in Brussels, Belgium, in an accompanying commentary also in Nature.

"The terrestrial impact record needs to be scrutinized more closely to identify and understand these periods of more intense bombardment, and to link them to the huge and dangerous game of billiards continuously being played out between the orbits of Mars and Jupiter," they said.

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