德干火山作用的喷发节奏与白垩纪-古近纪边界的关系。
The eruptive tempo of Deccan volcanism in relation to the Cretaceous-Paleogene boundary.
作者信息
Sprain Courtney J, Renne Paul R, Vanderkluysen Loÿc, Pande Kanchan, Self Stephen, Mittal Tushar
机构信息
Department of Earth and Planetary Science, University of California, Berkeley, 307 McCone Hall, Berkeley, CA 94720-4767, USA.
Geomagnetism Laboratory, Department of Earth, Ocean and Ecological Sciences, University of Liverpool, Liverpool L69 7ZE, UK.
出版信息
Science. 2019 Feb 22;363(6429):866-870. doi: 10.1126/science.aav1446.
Late Cretaceous records of environmental change suggest that Deccan Traps (DT) volcanism contributed to the Cretaceous-Paleogene boundary (KPB) ecosystem crisis. However, testing this hypothesis requires identification of the KPB in the DT. We constrain the location of the KPB with high-precision argon-40/argon-39 data to be coincident with changes in the magmatic plumbing system. We also found that the DT did not erupt in three discrete large pulses and that >90% of DT volume erupted in <1 million years, with ~75% emplaced post-KPB. Late Cretaceous records of climate change coincide temporally with the eruption of the smallest DT phases, suggesting that either the release of climate-modifying gases is not directly related to eruptive volume or DT volcanism was not the source of Late Cretaceous climate change.
白垩纪晚期的环境变化记录表明，德干暗色岩（DT）火山活动导致了白垩纪-古近纪界线（KPB）生态系统危机。然而，要验证这一假设需要在德干暗色岩中确定KPB的位置。我们利用高精度的氩-40/氩-39数据将KPB的位置限定为与岩浆管道系统的变化相一致。我们还发现，德干暗色岩并非以三个离散的大脉冲形式喷发，且超过90%的德干暗色岩体积在不到100万年的时间内喷发，其中约75%是在KPB之后就位的。白垩纪晚期的气候变化记录在时间上与德干暗色岩最小阶段的喷发相吻合，这表明要么气候调节气体的释放与喷发量没有直接关系，要么德干暗色岩火山活动不是白垩纪晚期气候变化的源头。
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