| 末元古系-寒武系底Sr、C同位素对比 |
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| 引用本文： | 杨杰东,张俊明.末元古系-寒武系底Sr、C同位素对比[J].高校地质学报,2000,6(4):532-545. |
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| 作者姓名： | 杨杰东 张俊明 |
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| 作者单位： | 1. 南京大学现代分析中心，江苏 南京 210093；2. 南京大学成矿机制研究国家重点 实验室，江苏 南京 210093；3. 中国科学院南京地质古生物研究所，江苏 南京 210008 |
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| 摘 要： | 测定了云南永善肖滩前寒武系-寒武系界限Sr同位素组成及湖北省三峡 剖面震旦系碳酸盐岩Sr、C同位素组成，并与蒙古、 加拿大、西伯利亚和纳米 比亚的末元古系Sr和C同位素数据进行了比较，得出末元古纪海水87Sr/86Sr和 δ13C值的演变图。通过该演变图，可以对全球末元古系地层进行对比。
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| 关 键 词： | 全球地层 锶同位素 碳同位素 末元古系－寒武系 |
| 收稿时间： | 2000-12-20 |
| 修稿时间： | 2000-12-20 |
Strontium and Carbon Isotopic Calibration of the Terminal Proterozoic |
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| XU Hui-fang.Strontium and Carbon Isotopic Calibration of the Terminal Proterozoic[J].Geological Journal of China Universities,2000,6(4):532-545. |
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| Authors: | XU Hui-fang |
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| Institution: | epartment of Earth and Planetary Sciences, The University of New Mexico, Albuquerque, New Mexico 87131, U.S.A． |
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| Abstract: | Sr isotopes of limestones for the Precambrian-Cambrian boundary from the Xiaotan section, Yongshan, Yunnan province, and Sr and C is otope s of carbonates for the Sinian System from the Sanxia section, Hubei province have been investigated. The results were compared with the Sr and C isotopic data der ived from Mongolia, Canada, Siberia and Namibia. A variation curve of 8 7Sr/86Sr and δ13C for the seawater of the terminal Proterozo ic was pr oposed.
Just before the terminal Proterozoic, the δ13C value of seawater was high , about +11‰, and the 87Sr/86Sr was about 0.7072. At the period o f glaciation corresponding to the Nantuo/Ice Brook, the δ13C value of sea water was negative, about -5‰, and the 87Sr/86Sr was about 0.7 077. Later on, the δ13C value rapidly rose with at least three fluctuations. At the time corresponding to the Dengying formation, the δ13C value showed a flat terrace about +2～+3‰, and the 87Sr/86Sr about 0.7084. At t he Precambrian-Cambrian boundary, the δ13C value rapidly rose from a neg ative value to about +6‰, and the 87Sr/86Sr kept at about 0.7084 .
From the variation curve of 87Sr/86Sr and δ13C for seawater proposed in the present study, the strata of the terminal Proterozoic in the world can be correlated with each other. |
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