| 内蒙古中部花岗质岩类年代学格架及该区构造岩浆演化探讨 |
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| 引用本文： | 石玉若,刘翠,邓晋福,简平.内蒙古中部花岗质岩类年代学格架及该区构造岩浆演化探讨[J].岩石学报,2014,30(11):3155-3171. |
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| 作者姓名： | 石玉若 刘翠 邓晋福 简平 |
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| 作者单位： | 中国地质科学院地质研究所, 北京离子探针中心, 北京 100037;中国地质大学, 北京 100083;中国地质大学, 北京 100083;中国地质科学院地质研究所, 北京离子探针中心, 北京 100037 |
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| 基金项目： | 本文受中国地质调查项目(1212011121075、1212011120332)和国土资源部公益性行业基金(201311116)联合资助. |
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| 摘 要： | 内蒙古中部广泛出露花岗质岩类,这些花岗质岩类的时空分布及岩石组合类型的变化,反映了华北板块北缘与蒙古陆块碰撞拼合的进程.本文从花岗质岩类的角度对古亚洲洋在内蒙古中部地区的演化进行了探讨.古亚洲洋在该区的演化经历了十分复杂的过程,包括奥陶纪双向俯冲、志留纪拼贴/增生、泥盆纪拉张、二叠纪南部带俯冲和北部带拉张、并以晚古生代末至早中生代初发生的陆-陆碰撞为标志宣告该区洋盆演化的结束.
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| 关 键 词： | 花岗质岩类 年代学格架 内蒙古中部 古亚洲洋 |
| 收稿时间： | 2014/2/10 0:00:00 |
| 修稿时间： | 2014/5/30 0:00:00 |
Geochronological frame of granitoids from Central Inner Mongolia and its tectonomagmatic evolution |
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| SHI YuRuo,LIU Cui,DENG JinFu and JIAN Ping.Geochronological frame of granitoids from Central Inner Mongolia and its tectonomagmatic evolution[J].Acta Petrologica Sinica,2014,30(11):3155-3171. |
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| Authors: | SHI YuRuo LIU Cui DENG JinFu and JIAN Ping |
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| Institution: | Beijing SHRIMP Center, Institute of Geology, Chinese Academy of Geological Sciences, Beijing 100037, China;China University of Geosciences, Beijing 100083, China;China University of Geosciences, Beijing 100083, China;Beijing SHRIMP Center, Institute of Geology, Chinese Academy of Geological Sciences, Beijing 100037, China |
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| Abstract: | The Central Asian Orogenic Belt (CAOB) is situated between the Siberian, North China and Tarim cratons. Central Inner Mongolia is located at southern margin of CAOB and northern margin of North China Craton (NCC). Granitoids widely distributed in this area were emplaced from Early Paleozoic to Mesozoic. Six major episodes of magmatism are identified: (a) 491~417Ma, the emplacement of quartz-diorite, granodiorite, tonalite, trondjemite, and biotite-monzogranite; (b) 390~387Ma, the intrusion of syenite, monzonite, A-type granite and diorite; (c) 353~302Ma, quartz-diorite, tonalite, monzogranite, and garnet-bearing granite; (d) 294~260Ma, alkaline granite and diorite; (e) 238~204Ma, monzogranite, A-type granite, muscovite-biotite-granite, and granodiorite; (f) <200Ma, monzogranite and syenogranite. The spatial-temporal distribution of the magmatic rocks from central Inner Mongolia and their assemblages were products of the subduction/accretion of Paleo-Asian Ocean, which evolved through a complicated subduction/obduction-accretion-extension (SOAE) system: subduction/obduction in two different directions in Ordovician, collage/accretion in Silurian, regional extension on the northern margin of the North China Craton in Devonian, and extension on the northern foldbelt in Permian. The final closure of the Paleo-Asian Ocean took place during Late Permian to Early Triassic was the end of the evolution of ocean and the beginning of the collision of continent-continent. |
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| Keywords: | Granitoids Chronological frame Central Inner Mongolia Paleo-Asian Ocean |
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