| 思茅陆块东缘二叠世末期碎屑锆石U-Pb年代学及微量元素组成研究 |
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| 引用本文： | 黄潮,夏小平,徐健.思茅陆块东缘二叠世末期碎屑锆石U-Pb年代学及微量元素组成研究[J].大地构造与成矿学,2019,43(2):339-353. |
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| 作者姓名： | 黄潮 夏小平 徐健 |
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| 作者单位： | 中国科学院 广州地球化学研究所, 同位素地球化学国家重点实验室, 广东 广州 510640;中国科学院大学, 北京 100049;中国科学院 广州地球化学研究所, 同位素地球化学国家重点实验室, 广东 广州 510640 |
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| 基金项目： | 国家重点研发计划;广州市科技计划;国家自然科学基金;国家自然科学基金 |
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| 摘 要： | 本文对采自云南哀牢山构造带西侧、思茅陆块东缘二叠纪末的四个砂岩样品中的碎屑锆石进行了LA-ICP-MS U-Pb年龄和微量元素测试,所有样品的年龄谱都显示出250～290 Ma的显著特征峰, XD37、XD40还得到900～1000 Ma的主特征峰和400～600 Ma的次特征峰;另外两个样品XD41和XD50也具有400～600 Ma和900～1000 Ma的特征峰,但是锆石数量较少。绝大部分的碎屑锆石微量元素都指示其源岩来自岩浆弧/造山带构造环境。结合前人研究成果,我们认为这些砂岩沉积于一个靠近思茅陆块边缘的弧后盆地,该弧后盆地可能是哀牢山洋二叠纪自东向西俯冲消减而产生。
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| 关 键 词： | 哀牢山构造带 碎屑锆石 U-PB年龄 锆石微量元素 古特提斯 |
U-Pb Age and Trace Element of the Permian Detrital Zircon on the East of Simao Block |
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| HUANG Chao,XIA Xiaoping,XU Jian.U-Pb Age and Trace Element of the Permian Detrital Zircon on the East of Simao Block[J].Geotectonica et Metallogenia,2019,43(2):339-353. |
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| Authors: | HUANG Chao XIA Xiaoping XU Jian |
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| Institution: | (State Key Laboratory of Isotope Geochemistry,Guangzhou Institute of Geochemistry,Chinese Academy ofSciences,Guangzhou 510640,Guangdong,China;University of Chinese Academy of Sciences,Beijing 100049,China) |
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| Abstract: | In this study,we present new U-Pb ages and trace element concentrations of detrital zircon grains from the Late Permian strata in the eastern margin of the Simao Block.All the four samples show a significant detrital zircon age peak at 250-290 Ma.Two samples(XD37 and XD40)also contain a major age peak at 900-1000 Ma and a minor age peak at 400-600 Ma,while the other two samples(XD41 and XD50)show similar age peaks although relatively less zircons were dated.The features of trace elements suggest that the detrital zircons came from an igneous arc or orgenic belt.Based on these data,we suggest that the Late Permian strata in the east margin of the Simao Block were deposited in a back-arc basin related to the westward subduction of the Ailaoshan Ocean. |
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| Keywords: | Ailaoshan tectonic belt detrital zircon U-Pb age trace element Paleo-Tethys |
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