期刊
EARTH AND PLANETARY SCIENCE LETTERS
卷 310, 期 3-4, 页码 389-400出版社
ELSEVIER
DOI: 10.1016/j.epsl.2011.08.010
关键词
Re-Os geochronology; Permo-Triassic extinction; Greenland-Norway; shale; anoxia
资金
- Petromaks [NFR 180015/S30]
- Geological Survey of Norway
- Statoil
- Eni Norge
The end of Permian time (252-251 Ma) hosts the largest mass extinction in Earth history, yet events heralding this global catastrophe remain intensely disputed. We present a chemostratigraphic marker, the Re-187/Os-188 ratio, which soars to unprecedented levels approaching the Permo-Triassic boundary. These ratios are tied to profound trace element changes and a precise Re-Os time record at 252 Ma preserved in black shales from East Greenland and the mid-Norwegian shelf. Within a 36-meter shale section, an 80-fold increase in Re concentrations (two-fold for Os) signals seawater conditions that became increasingly inhospitable to life. Unwavering initial Os-187/Os-188 ratios of 0.6 preclude mafic volcanism and meteorite impact as the direct cause of Late Permian anoxia. We argue that extraordinarily high Re-187/Os-188 ratios are the hallmark of simultaneously rising ocean temperature and acidity, leading to loss of oxygen and the stifling of life in latest Permian time. (C) 2011 Elsevier B.V. All rights reserved.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据