| 江汉盆地周缘主要河流沉积物碎屑磷灰石的微量元素特征及其物源判别指标分析 |
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| 关键词:Jianghan Basin modern sediments detrital apatite trace element provenance discriminant indicators |
| 基金项目:国家自然科学基金项目(编号: 41671011; 41877292; 41972212) |
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| Detrital Apatite Trace Element Characteristics of Main Rivers around Jianghan Basin and An Analysis of Their Provenance Discriminant Indicators |
| Sediments deposited in the Jianghan Basin record important information about the formation and evolution of the Yangtze River, and hence the provenance tracer of detrital materials in the basin has always been a hot topic, but the timing of the cutting through the Yangtze River is still inconclusive. Apatite is a common accessory mineral in fluvial sediments, and trace elements of apatite are mainly affected by their source rocks and significant differences in the trace elements of apatite existent in different regions, so it can be used as a good indicator of source minerals. On such a basis, the authors used the laser ablation inductively coupled plasma mass spectrometry (LA-ICP-MS) in combination with the multi-dimensional identification (MDS) of statistical method to systematically analyze new indicator so as to distinguish the provenance of the upper and middle reaches of the Yangtze River; the MDS diagram also verifies the rationality of the characteristic elements indicators. The results indicate that the Sr/Y ratio of detrital apatite can be used to distinguish the provenance of Hanjiang River, Yuanjiang River, Xiangjiang River and main stream of the Yangtze River in the study area. The bivariate diagrams of trace elements of Nd-Sm, Sm-Eu, Eu-Gd and La/Yb-La/Sm can effectively distinguish the provenance of the upper and middle reaches of the Yangtze River. On the whole, the trace element ratio diagram and distribution characteristics of REE have great potential in the study of provenance tracer in large rivers. |
| SU Jian-chao,LI Chang-an,WU Zhong-hai,LIN Xu,LI Ya-wei,GUO Ru-jun.2021.Detrital Apatite Trace Element Characteristics of Main Rivers around Jianghan Basin and An Analysis of Their Provenance Discriminant Indicators[J].Acta Geoscientica Sinica,42(5):641-650. |
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