| 湘西及邻区晚震旦世—早二叠世黑色岩系的沉积环境——Ce、Nd同位素制约 |
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| 引用本文：李志昌,陈孝红,刘文贵.1999.湘西及邻区晚震旦世—早二叠世黑色岩系的沉积环境——Ce、Nd同位素制约[J].地球学报,20(4):368-377. |
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| 基金项目:《湖北黄陵地区陆壳演化的Ce同位素示踪》项目; 国土资源部同位素地质研究开放实验室及部行业基金(编号959611)资助 |
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| 中文摘要:测定了湘西及邻区晚震旦世—早二叠世25个黑色岩系样品的La-Ce和Sm-Nd同位素数据。它们的εCe(t) 和εNd(t) 值分别变化在- 1.6 ～+ 2.6和- 1.4 ～- 11.0范围内,δCe值为0.28 ～1.68 ,T2 DM 年龄为1358 ～2207 Ma。在εCe(t)-εNd(t) 图上,全部数据点可以分成3个区,不同的分区显示了黑色岩系的不同沉积环境与构造背景。在沉积环境研究中Ce同位素是有用的地球化学示踪器。 |
| 中文关键词:Ce、Nd同位素 沉积环境 黑色岩系 |
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| Depositional Environments of the Late Sinian—Early Permian Black Rock Series——Ce,Nd Isotopic Constraint |
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| Abstract:Ce isotopic data and Nd isotopic data were determined for 25 samples of late Sinian-early Permian black rock series from western Hunan and adjacent rigions. ε Ce ( t ) and ε Nd ( t ) values of 25 samples are -1.6～+2.6 and -1.4～-11.0, respectively,δ Ce are 0.28～1.68,and T 2DM ages are 1358～2207Ma. All data points in the ε Ce ( t ) vs.ε Nd ( t ) diagram could be divided into three different fields(A,B,C),which show different depositional environments and structural backgrounds of black rock series in ocean basins.These results indicate that the Ce isotope is a useful geochemical tracer in determining the depositional and structural environments of the studied marine sedimentary rocks such as black rock series. |
| keywords:Ce, Nd isotope depositional environment black rock series |
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