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Title : New Research Supports Theory of Extraterrestrial Impact
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New Research Supports Theory of Extraterrestrial Impact

An international team of 16 members of researchers that includes James Kennett, professor of earth sciences at UC Santa Barbara, has identified a layer about 13,000 years old, of fine sediment, dark buried on the floor of Lake Cuitzeo in central Mexico. The sediment layer contains an exotic array of materials, including nanodiamonds, impact spherules, and more, which, according to researchers, are the result of a cosmic body impacting Earth.

These new data are the latest to strongly support a controversial hypothesis proposing that a major cosmic impact with Earth occurred 12,900 years ago at the start of an unusual cold climatic period called the Younger Dryas. The researchers appear in the Proceedings of the National Academy of Sciences.

Tectonic effects '' the collision of a globule with another during the cosmic impact. (Credit: Image courtesy of University of California - Santa Barbara)
The realization of a wide range of extensive testing, researchers conclusively they identified a family of nanodiamonds, including the impact form lonsdaleite called nanodiamonds, which is unique to cosmic impact. The researchers also found spherules that had collided at high speed with other spherules during the chaos of impact. Such features, Kennett noted, could not have formed through anthropogenic, volcanic, or other natural terrestrial processes. "These materials form only through cosmic impact," said


The data suggest that a comet or asteroid. - Probably a body previously large fragmented , higher than several hundred meters in diameter - entered the atmosphere at a relatively shallow angle. The heat in the burning impact of biomass, surface rocks melted and caused major environmental disruption. "These results are consistent with findings previously reported throughout North abrupt ecosystem change, the extinction of megafauna America, and cultural change and the reduction of the human population," said Kennett.


the sediment layer identified by the researchers is the same age as already reported in numerous locations throughout Western Europe, North America, Greenland and. The current discovery extends the known distribution of nanodiamond layer rich in Mexico and in the tropics. In addition, it is the first reported for true lacustrine deposits.


Throughout the geological record, there are only two known continental layers with abundance peaks in nanodiamonds, impact spherules, and aciniform soot. These are the Cretaceous-Paleogene layer 65 million years old, this limit coincided with major extinctions, including the dinosaurs and ammonites; and the limit event Younger Dryas to 12,900 years ago, closely associated with extinctions of large animals in North America, including mammoths, mastodons, saber-toothed cats and giant wolves.


"the timing of the impact event coincided with the most extraordinary biotic and environmental changes in Mexico and Central America during the last approximately 20,000 years, as recorded by others in several regional lake deposits," Kennett said . "These changes were large, abrupt and unprecedented, and have been recorded and identified by previous researchers as a" time of crisis ". "


Other scientists contributing to the research include Isabel Israde-Alcántara and Gabriela Dominguez-Vásquez of the Universidad Michoacana de San Nicolas de Hidalgo, James L. Bischoff of the US Geological Survey .; Hong Chun-Li, National Taiwan University; Paul S. DeCarli of SRI International; Ted E. Bunch and James H. Wittke of Northern Arizona University; James C. Weaver of Harvard University; Richard B. Firestone of Lawrence Berkeley National Laboratory; Allen west of GeoScience Consulting, Chris Mercer, National Institute for Materials Science; Sujing Zie and Eric K. Richman of the University of . Oregon, Eugene, and Charles R. Kinzie and Wendy S. Wolbach of DePaul University
Source: ScienceDaily

"New Research Supports Theory of Extraterrestrial Impact", article source: riseearth.com

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