| 内蒙古化德地区二叠纪—三叠纪侵入岩年代学及地球化学特征：对古亚洲洋东段构造演化的制约 |
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| 引用本文： | 靳胜凯,刘博,马明,殷嘉乐.内蒙古化德地区二叠纪—三叠纪侵入岩年代学及地球化学特征：对古亚洲洋东段构造演化的制约[J].地质学报,2024,98(1):116-137. |
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| 作者姓名： | 靳胜凯 刘博 马明 殷嘉乐 |
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| 作者单位： | 1） 中国地质调查局廊坊自然资源综合调查中心，河北廊坊，065000；2） 中国地质大学（北京）地质过程与矿产资源国家重点实验室，北京，100083;1） 中国地质调查局廊坊自然资源综合调查中心，河北廊坊，065000= |
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| 基金项目： | 本文为中国地质调查局地质调查项目（编号 DD20230251、DD20208003）资助的成果 |
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| 摘 要： | 本文对华北克拉通北缘中段内蒙古化德地区二叠纪—三叠纪5个花岗质侵入体进行了岩相学、地球化学、锆石U Pb年代学以及Sr Nd Hf同位素研究。结果表明本次所研究的岩体主要起源于华北克拉通古老下地壳的部分熔融，八音察汗岩体形成于早二叠世（276±1 Ma），在岩浆上升过程中发生了岩浆混合作用；白音特拉岩体形成于中二叠世（270±1 Ma），为地壳加厚作用下变质杂砂岩部分熔融形成的S型花岗岩；毛忽庆岩体形成于晚二叠世（254±1 Ma），为I型花岗岩；张万良岩体与康家地岩体分别形成于早三叠世（248±1 Ma）和晚三叠世（229±1 Ma），两者均为A型花岗岩。综合前人研究，本文认为研究区在早二叠世—晚三叠世经历了古亚洲洋向华北板块俯冲、俯冲 同碰撞、持续碰撞以及造山后的伸展4个阶段，古亚洲洋东段在研究区的闭合时间应为中二叠世晚期。
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| 关 键 词： | 古亚洲洋 花岗质岩石 锆石U Pb年代学 Sr Nd Hf同位素 内蒙古化德地区 |
| 收稿时间： | 2023/2/24 0:00:00 |
| 修稿时间： | 2023/6/4 0:00:00 |
Zircon U- Pb geochronology and geochemistry of the Permian- Triassic granitic intrusions in the Huade area, Inner Mongolia, NE China: Constraints on the tectonic evolution of the Paleo- Asian Ocean |
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| JIN Shengkai,LIU Bo,MA Ming,YIN Jiale.Zircon U- Pb geochronology and geochemistry of the Permian- Triassic granitic intrusions in the Huade area, Inner Mongolia, NE China: Constraints on the tectonic evolution of the Paleo- Asian Ocean[J].Acta Geologica Sinica,2024,98(1):116-137. |
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| Authors: | JIN Shengkai LIU Bo MA Ming YIN Jiale |
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| Institution: | 1) Langfang Comprehensive Natural Resources Survey Center, China Geological Survey, Langfang, Hebei 065000, China; 2) State Key Laboratory of Geological Processes and Mineral Resources, China University of Geosciences, Beijing 100083, China |
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| Abstract: | This paper presents detailed petrological, zircon U- Pb chronological, whole- rock geochemical and Sr- Nd- Hf isotopic studies on the Permian- Triassic granitic intrusions in Huade County, Inner Mongolia. The geochemical and isotopic features indicate that the studied intrusions were derived from a Paleo- to Mesoproterozoic crustal source of the North China craton. The Bayinchahan intrusions experienced magma mixing during the magma upwelling. The Baiyintla intrusions were S- type granite formed by partial melting of metamorphic greywacke during crustal thickening, the Maohuqing intrusions were I- type granite, the Kangjiadi and the Zhangwanliang intrusions were A- type granite. Zircon dating results indicate that the Bayinchahan, Baiyintela, Maohuqing, Zhangwanliang and Kangjiadi plutons were formed in the Early Permian (276±1 Ma), the Middle Permian (270±1 Ma), the Late Permian (254±1 Ma), the Early Triassic (248±1 Ma) and the Late Triassic (229±1 Ma), respectively. Combined with previous studies, we conclude that the study area experienced subduction, subduction- collision, continuous collision and post- orogenic extension during the Early Permian to Late Triassic. The closing time of the eastern part of the Paleo- Asian Ocean in the study area should be the late Middle Permian. |
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| Keywords: | Paleo- Asian Ocean granites zircon U- Pb dating Sr- Nd- Hf isotopes Huade area Inner Mongolia |
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