Evidence from central Mexico supporting the Younger Dryas extraterrestrial impact hypothesis
We report the discovery in Lake Cuitzeo in central Mexico of a black, carbon-rich, lacustrine layer, containing nanodiamonds, microspherules, and other unusual materials that date to the early Younger Dryas and are interpreted to result from an extraterrestrial impact. These proxies were found in a...
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ftpubmed:oai:pubmedcentral.nih.gov:3324006 2023-05-15T16:29:55+02:00 Evidence from central Mexico supporting the Younger Dryas extraterrestrial impact hypothesis Israde-Alcántara, Isabel Bischoff, James L. Domínguez-Vázquez, Gabriela Li, Hong-Chun DeCarli, Paul S. Bunch, Ted E. Wittke, James H. Weaver, James C. Firestone, Richard B. West, Allen Kennett, James P. Mercer, Chris Xie, Sujing Richman, Eric K. Kinzie, Charles R. Wolbach, Wendy S. 2012-03-27 http://www.ncbi.nlm.nih.gov/pmc/articles/PMC3324006 http://www.ncbi.nlm.nih.gov/pubmed/22392980 https://doi.org/10.1073/pnas.1110614109 en eng National Academy of Sciences http://www.ncbi.nlm.nih.gov/pmc/articles/PMC3324006 http://www.ncbi.nlm.nih.gov/pubmed/22392980 http://dx.doi.org/10.1073/pnas.1110614109 Freely available online through the PNAS open access option. PNAS Plus Text 2012 ftpubmed https://doi.org/10.1073/pnas.1110614109 2013-09-04T05:27:42Z We report the discovery in Lake Cuitzeo in central Mexico of a black, carbon-rich, lacustrine layer, containing nanodiamonds, microspherules, and other unusual materials that date to the early Younger Dryas and are interpreted to result from an extraterrestrial impact. These proxies were found in a 27-m-long core as part of an interdisciplinary effort to extract a paleoclimate record back through the previous interglacial. Our attention focused early on an anomalous, 10-cm-thick, carbon-rich layer at a depth of 2.8 m that dates to 12.9 ka and coincides with a suite of anomalous coeval environmental and biotic changes independently recognized in other regional lake sequences. Collectively, these changes have produced the most distinctive boundary layer in the late Quaternary record. This layer contains a diverse, abundant assemblage of impact-related markers, including nanodiamonds, carbon spherules, and magnetic spherules with rapid melting/quenching textures, all reaching synchronous peaks immediately beneath a layer containing the largest peak of charcoal in the core. Analyses by multiple methods demonstrate the presence of three allotropes of nanodiamond: n-diamond, i-carbon, and hexagonal nanodiamond (lonsdaleite), in order of estimated relative abundance. This nanodiamond-rich layer is consistent with the Younger Dryas boundary layer found at numerous sites across North America, Greenland, and Western Europe. We have examined multiple hypotheses to account for these observations and find the evidence cannot be explained by any known terrestrial mechanism. It is, however, consistent with the Younger Dryas boundary impact hypothesis postulating a major extraterrestrial impact involving multiple airburst(s) and and/or ground impact(s) at 12.9 ka. Text Greenland PubMed Central (PMC) Greenland Proceedings of the National Academy of Sciences 109 13 E738 E747 |
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PNAS Plus Israde-Alcántara, Isabel Bischoff, James L. Domínguez-Vázquez, Gabriela Li, Hong-Chun DeCarli, Paul S. Bunch, Ted E. Wittke, James H. Weaver, James C. Firestone, Richard B. West, Allen Kennett, James P. Mercer, Chris Xie, Sujing Richman, Eric K. Kinzie, Charles R. Wolbach, Wendy S. Evidence from central Mexico supporting the Younger Dryas extraterrestrial impact hypothesis |
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PNAS Plus |
description |
We report the discovery in Lake Cuitzeo in central Mexico of a black, carbon-rich, lacustrine layer, containing nanodiamonds, microspherules, and other unusual materials that date to the early Younger Dryas and are interpreted to result from an extraterrestrial impact. These proxies were found in a 27-m-long core as part of an interdisciplinary effort to extract a paleoclimate record back through the previous interglacial. Our attention focused early on an anomalous, 10-cm-thick, carbon-rich layer at a depth of 2.8 m that dates to 12.9 ka and coincides with a suite of anomalous coeval environmental and biotic changes independently recognized in other regional lake sequences. Collectively, these changes have produced the most distinctive boundary layer in the late Quaternary record. This layer contains a diverse, abundant assemblage of impact-related markers, including nanodiamonds, carbon spherules, and magnetic spherules with rapid melting/quenching textures, all reaching synchronous peaks immediately beneath a layer containing the largest peak of charcoal in the core. Analyses by multiple methods demonstrate the presence of three allotropes of nanodiamond: n-diamond, i-carbon, and hexagonal nanodiamond (lonsdaleite), in order of estimated relative abundance. This nanodiamond-rich layer is consistent with the Younger Dryas boundary layer found at numerous sites across North America, Greenland, and Western Europe. We have examined multiple hypotheses to account for these observations and find the evidence cannot be explained by any known terrestrial mechanism. It is, however, consistent with the Younger Dryas boundary impact hypothesis postulating a major extraterrestrial impact involving multiple airburst(s) and and/or ground impact(s) at 12.9 ka. |
format |
Text |
author |
Israde-Alcántara, Isabel Bischoff, James L. Domínguez-Vázquez, Gabriela Li, Hong-Chun DeCarli, Paul S. Bunch, Ted E. Wittke, James H. Weaver, James C. Firestone, Richard B. West, Allen Kennett, James P. Mercer, Chris Xie, Sujing Richman, Eric K. Kinzie, Charles R. Wolbach, Wendy S. |
author_facet |
Israde-Alcántara, Isabel Bischoff, James L. Domínguez-Vázquez, Gabriela Li, Hong-Chun DeCarli, Paul S. Bunch, Ted E. Wittke, James H. Weaver, James C. Firestone, Richard B. West, Allen Kennett, James P. Mercer, Chris Xie, Sujing Richman, Eric K. Kinzie, Charles R. Wolbach, Wendy S. |
author_sort |
Israde-Alcántara, Isabel |
title |
Evidence from central Mexico supporting the Younger Dryas extraterrestrial impact hypothesis |
title_short |
Evidence from central Mexico supporting the Younger Dryas extraterrestrial impact hypothesis |
title_full |
Evidence from central Mexico supporting the Younger Dryas extraterrestrial impact hypothesis |
title_fullStr |
Evidence from central Mexico supporting the Younger Dryas extraterrestrial impact hypothesis |
title_full_unstemmed |
Evidence from central Mexico supporting the Younger Dryas extraterrestrial impact hypothesis |
title_sort |
evidence from central mexico supporting the younger dryas extraterrestrial impact hypothesis |
publisher |
National Academy of Sciences |
publishDate |
2012 |
url |
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC3324006 http://www.ncbi.nlm.nih.gov/pubmed/22392980 https://doi.org/10.1073/pnas.1110614109 |
geographic |
Greenland |
geographic_facet |
Greenland |
genre |
Greenland |
genre_facet |
Greenland |
op_relation |
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC3324006 http://www.ncbi.nlm.nih.gov/pubmed/22392980 http://dx.doi.org/10.1073/pnas.1110614109 |
op_rights |
Freely available online through the PNAS open access option. |
op_doi |
https://doi.org/10.1073/pnas.1110614109 |
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Proceedings of the National Academy of Sciences |
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109 |
container_issue |
13 |
container_start_page |
E738 |
op_container_end_page |
E747 |
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1766019620163026944 |