1. The contribution of the Emeishan large igneous province to the strontium isotope evolution of the Capitanian seawater.
- Author
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Huang, Hu, Hou, Mingcai, Qing, Hairuo, Zhou, Lian, Yang, Jianghai, Du, Yuansheng, Tian, Jingchun, Ni, Shijun, and Xiong, Fuhao
- Subjects
STRONTIUM isotopes ,IGNEOUS provinces ,BIOLOGICAL evolution ,COASTAL changes ,OCEAN ,VOLCANIC eruptions ,SEAWATER ,RYANODINE receptors - Abstract
The
87 Sr/86 Sr minimum of the Capitanian seawater is one of the most significant features in the Phanerozoic seawater87 Sr/86 Sr history. In order to assess possible contribution of the Emeishan large igneous provinces (LIPs) to strontium isotope evolution of the Capitanian seawater,87 Sr/86 Sr ratios were measured from the Capitanian limestones which are locally interlayered with the Emeishan basalts. The limestones underlying the Emeishan basalts have high87 Sr/86 Sr ratios (0.7070–0.7074). However, extremely low87 Sr/86 Sr ratios (0.7068–0.7070) were identified in the late Capitanian Jinogondolella prexuanhanensis–J. xuanhanensis zones, which correspond to the eruption time of the Emeishan LIP. The temporal coincidence of these two phenomena supports the idea of a potential linkage between Capitanian87 Sr/86 Sr minimum and eruption of this igneous province. The strong submarine hydrothermal activity and erosion of the Emeishan LIP could have released large amounts of non-radiogenic Sr to the oceans and play an important role in strontium isotope evolution of the seawater. [ABSTRACT FROM AUTHOR]- Published
- 2019
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