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Jurassic Forum » JURASSIC references & paper reviews » Jurassic around the world » Nozaki et al., 2013 (Late Jurassic ocean anoxic event)
Nozaki et al., 2013
mhornДата: Wednesday, 05.06.2013, 09:54 | Сообщение # 1
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Nozaki T., Kato Y., Suzuki K. (2013) Late Jurassic ocean anoxic event: evidence from voluminous sulphide deposition and preservation in the Panthalassa // Scientific Reports 3, Article number: 1889 doi:10.1038/srep01889

http://www.nature.com/srep/2013/130528/srep01889/full/srep01889.html

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 87Sr/86Sr 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 δ13C excursion and widespread deposition of petroleum source rocks and black shales.



Middle Jurassic - Lower Cretaceous ammonites & aptychi
 
Jurassic Forum » JURASSIC references & paper reviews » Jurassic around the world » Nozaki et al., 2013 (Late Jurassic ocean anoxic event)
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