OCEANIC ANOXIA AT THE PRECAMBRIAN-CAMBRIAN BOUNDARY
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dc.contributor.author | Kimura H. | |
dc.contributor.author | Watanabe Y. | |
dc.date.accessioned | 2021-04-10T08:11:00Z | |
dc.date.available | 2021-04-10T08:11:00Z | |
dc.date.issued | 2001 | |
dc.identifier | https://www.elibrary.ru/item.asp?id=41909193 | |
dc.identifier.citation | Geology, 2001, 29, 11, 995-998 | |
dc.identifier.issn | 0091-7613 | |
dc.identifier.uri | https://repository.geologyscience.ru/handle/123456789/27634 | |
dc.description.abstract | The Precambrian-Cambrian (PC-C) boundary separates fossils representing two discrete evolutionary phases: the Neoproterozoic soft-bodied Ediacarian biotas and Cambrian small shelly faunas. The biological discontinuity is suspected to have been a result of mass extinction; however, recent discoveries of the Ediacarian biotas in Cambrian sediments have led to an understanding that the faunal change was gradual through the PC-C transition. Th/U ratios, which are high in oxidizing conditions and low in reducing conditions, show a considerable positive correlation with delta13C values at all studied sites of the PC-C boundary. This correlation indicates that reported delta13C variation across the PC-C boundary from numerous localities corresponds to redox variation in the depositional environment. The negative delta13C anomaly that occurs worldwide at the PC-C boundary, therefore, corresponds to the widespread development of an oxygen-deficient shallow marine environment. This finding suggests that widespread oceanic oxygen deficiency, which has been interpreted to reflect Phanerozoic mass extinction events, also occurred immediately before the Cambrian explosion. | |
dc.subject | anoxic environments | |
dc.subject | bioturbation | |
dc.subject | mass extinctions | |
dc.subject | Cambrian | |
dc.subject | Precambrian | |
dc.title | OCEANIC ANOXIA AT THE PRECAMBRIAN-CAMBRIAN BOUNDARY | |
dc.type | Статья | |
dc.subject.age | Paleozoic::Cambrian | |
dc.subject.age | Precambrian | |
dc.subject.age | Палеозой::Кембрийская | ru |
dc.subject.age | Докембрий | ru |
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