期刊
SCIENTIFIC REPORTS
卷 3, 期 -, 页码 -出版社
NATURE PUBLISHING GROUP
DOI: 10.1038/srep01889
关键词
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资金
- Japan Society for the Promotion of Science [15204048, 17403012, 07J02740, 21840069, 20109006, 20340158]
- Grants-in-Aid for Scientific Research [15204048, 21109006, 20340158, 23540535, 21840069, 17403012, 07J02740, 24740360, 23540552, 22226015] Funding Source: KAKEN
The historically productive copper-bearing Besshi-type sulphide deposits in the Japanese accretionary complex were formed as volcanogenic massive sulphide deposits on the deep-sea floor of the Panthalassa Ocean. Here we report that eleven typical Besshi-type deposits yielded Re-Os isochron ages around 150 Ma (148.4 +/- 1.4 Ma from the composite isochron) in Late Jurassic time. This date coincides with the lowest marine Sr-87/Sr-86 ratio and highest atmospheric CO2 concentration of the past 300 million years. We infer that intense mid-ocean ridge hydrothermal and volcanic activity in the Late Jurassic produced huge sulphide deposits and large emissions of CO2 gas, leading to global warming and a stratified Panthalassa Ocean with anoxic deep seas that favored preservation of sulphides in the pelagic environment. The emergence of ocean anoxia triggered by seafloor volcanism is also consistent with a positive delta C-13 excursion and widespread deposition of petroleum source rocks and black shales.
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