| 武功山杂岩高滩组沉积时代与物源特征:来自含榴云母石英片岩锆石U-Pb年龄与稀土元素组成的新证据 |
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| 引用本文： | 王义龙,周万蓬,刘平华,田忠华,张宇佳.武功山杂岩高滩组沉积时代与物源特征:来自含榴云母石英片岩锆石U-Pb年龄与稀土元素组成的新证据[J].地球科学,2022,47(3):1078-1093. |
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| 作者姓名： | 王义龙 周万蓬 刘平华 田忠华 张宇佳 |
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| 作者单位： | 1.东华理工大学核资源与环境国家重点实验室, 江西南昌 330013 |
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| 基金项目： | 国家自然科学基金项目(Nos.41972205,41672191)；;中国地质调查局地质大调查项目(Nos.DD20221649,DD20190003,DD20190370)； |
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| 摘 要： | 武功山地区高滩组是华南板块分布较为广泛的早古生代地层之一，经历了绿片岩相?角闪岩相变质，其沉积时代限定与物源性质确定对客观重建华南板块早古生代地壳演化过程具有重要的意义.本文利用LA-ICP-MS对高滩组中的含榴云母石英片岩进行了碎屑锆石U-Pb测年与稀土元素分析，获得含榴云母石英片岩最年轻一组碎屑锆石年龄为524±12 Ma，结合区域上高滩组被早古生代约462 Ma花岗岩侵入的地质关系，初步限定武功山地区高滩组的沉积时代为524~462 Ma.高滩组含榴云母石英片岩碎屑锆石U-Pb年龄变化于3 622~497 Ma之间，最主要的年龄峰值为956 Ma，4个次要的年龄峰值分别为2 456 Ma、1 644 Ma、850 Ma与524 Ma.对比扬子、华夏陆块早古生代沉积岩系的碎屑锆石年龄图谱，发现高滩组与华夏陆块早古生代地层具有相似的物源特征，指示早古生代期间武功山地区属于华夏陆块的组成部分.
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| 关 键 词： | 武功山杂岩 高滩组 含榴云母石英片岩 锆石U-Pb定年 地球化学 |
| 收稿时间： | 2021-10-01 |
Depositional Timing and Provenance Characteristics of the Early Paleozoic Gaotan Formation in the Wugongshan Area,Jiangxi Province: New Evidence from Detrital Zircon U-Pb Dating and Rare Earth Element Compositions of Garnet-Bearing Mica Quartz Schist |
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| Abstract: | The Gaotan Formation, which has undergone greenschist to amphibolite facies metamorphism, is one of the most widely distributed Early Paleozoic strata units in the Wugongshan complex of Jiangxi Province. Depositional timing and provenance of the Gaotan Formation is vital for probing the Early Paleozoic crustal evolutionary of the Wugongshan complex. In this paper, LA-ICP-MS (laser ablation inductively coupled plasma mass spectrometry) was used to analyze the zircon U-Pb ages and rare earth element compositions of bearing-garnet micas quartz schist in the Gaotan Formation of the Wugongshan complex. The age of the youngest group of detrital zircons from the garnet-bearing micas quartz schist is 524±12 Ma, combined with geological relationship which the Gaotan Formation was intruded by the ca. 462 Ma granites in the Wugongshan complex, it is speculated that the depositional timing of the Gaotan formation is 524-462 Ma. Detrital zircon U-Pb ages of the Gaotan Formation range from 3 622 Ma to 497 Ma, with the main age peak of 956 Ma and four secondary age peaks of 2 456 Ma, 1 644 Ma, 850 Ma and 524 Ma, respectively. By comparing the detrital zircon ages of the Early Paleozoic sedimentary rocks in the Yangtze and Cathaysia blocks, the provenance characteristics of the Gaotan Formation are similar to the Early Paleozoic strata in the Cathaysia block, indicating that the Wugongshan complex was a part of the Cathaysia block during the Early Paleozoic. |
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