| 四川东部华蓥山海相二叠/三叠系界线附近的锶同位素组成 |
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| 关键词:Permian Triassic strontium isotope stratigraphy Huaying Mountain eastern Sichuan |
| 基金项目:国家自然科学基金项目(编号: 40839908, 40672072)和教育部博士点基金项目(编号: 20050616005) |
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| 摘要: |
| Strontium Isotopic Composition Near Marine Permian/Triassic Boundary of the Huaying Mountain, Eastern Sichuan |
| Geochemical records play an important role in the study of the Permian/Triassic boundary, where geological environment significantly changed. Based on the fundamental principle of strontium isotope stratigraphy, the authors analyzed the rock fabric and chemical composition, made preservative evaluation for coeval seawater of the carbonate rock samples near the Permian/Triassic boundary in the Huaying Mountain, eastern Sichuan, and then measured strontium isotopic composition of the samples. These samples haven’t suffered much from the strong diagenetic alteration and can represent preferably the coeval seawater, as evidenced by their relatively good original sedimentary fabric and high Sr concentrations. The 87Sr/86Sr ratios of six samples vary from 0.707158 to 0.707334, and are consistent with available 87Sr/86Sr ratios of coeval seawater near the Permian/Triassic boundary, suggesting the global control of geological events over the 87Sr/86Sr ratios of seawater. The application of stron-tium isotope stratigraphy to the Permian/Triassic boundary in the Huaying Mountain will provide some useful ba-sic data for the chemo-stratigraphic and global correlative studies of marine Permian/Triassic boundary in South China. |
| HU Zuo-wei,HUANG Si-jing,LIU Li-hong,TONG Hong-peng,HE Yan-xiang.2010.Strontium Isotopic Composition Near Marine Permian/Triassic Boundary of the Huaying Mountain, Eastern Sichuan[J].Acta Geoscientica Sinica,31(6):853-859. |
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