Department of Earth and Environmental Sciences, University of Michigan, 1100N. University Ave., Ann Arbor, MI, 48109, USA.
Geology Department, Grand Valley State University, 1 Campus Drive, Allendale, MI, 49401, USA.
Nat Commun. 2019 Dec 16;10(1):5356. doi: 10.1038/s41467-019-13366-0.
The climate and environmental significance of the Deccan Traps large igneous province of west-central India has been the subject of debate in paleontological communities. Nearly one million years of semi-continuous Deccan eruptive activity spanned the Cretaceous-Paleogene boundary, which is renowned for the extinction of most dinosaur groups. Whereas the Chicxulub impactor is acknowledged as the principal cause of these extinctions, the Deccan Traps eruptions are believed to have contributed to extinction patterns and/or enhanced ecological pressures on biota during this interval of geologic time. We present the first coupled records of biogenic carbonate clumped isotope paleothermometry and mercury concentrations as measured from a broad geographic distribution of marine mollusk fossils. These fossils preserve evidence of simultaneous increases in coastal marine temperatures and mercury concentrations at a global scale, which appear attributable to volcanic CO and mercury emissions. These early findings warrant further investigation with additional records of combined Late Cretaceous temperatures and mercury concentrations of biogenic carbonate.
印度中西部德干岩群的气候和环境意义一直是古生物学界争论的主题。近 100 万年的德干喷发活动跨越了白垩纪-古近纪之交，而这一时期正是大多数恐龙群灭绝的地方。奇克苏鲁布撞击器被认为是这些灭绝的主要原因，而德干岩群的喷发被认为在这段地质时间内对生物群的灭绝模式和/或生态压力的增加起到了一定作用。我们首次提供了生物成因碳酸盐同位素测温法和汞浓度的耦合记录，这些数据是从广泛分布的海洋软体动物化石中测量得到的。这些化石保存了全球范围内沿海海洋温度和汞浓度同时升高的证据，这似乎归因于火山 CO 和汞的排放。这些早期发现值得进一步研究，以获得更多关于晚白垩世生物成因碳酸盐的温度和汞浓度的综合记录。
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