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中国东部燕山期火成岩构造组合与造山——深部过程
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引用本文:邓晋福,赵国春.2000.中国东部燕山期火成岩构造组合与造山——深部过程[J].地质论评,46(1):41-48
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邓晋福  赵国春
中国地质大学,北京,100083
基金项目:国家攀登计划,国土资源部科研项目,中国科学院资助项目,SSER-111-2,9501112,9501102-04-02,9501105-03-02,49772155,,,
中文摘要:中国东部燕山期火成岩构造组合可识别出两种类型,大多数的火成人有类似于安第斯和美国西部的大陆边缘弧的岩石学与地球化学性质;南岭地区则发育海西型黑云母、二云母和白云母花岗岩组合。沿岩浆构造带可识别出3个火成岩段。按岩浆--构造事件序列,北、中、南段分别为反时针、顺时针和反时针+顺时针的pTt轨迹。在中段,玄武岩岩浆底侵作用发生于陆壳增厚之后,即顺时针pTt轨迹的造山--深部过程被认为是钾玄岩组合占优势
中文关键词:中国 燕山期 火成岩 构造组合 造山--深部过程
 
Yanshanian Igneous Petrotectonic Assemblsge and Orogenic-Deep Processes in East China
Deng Jinfu  Zhao Guochun  Zhao Hailing  Luo Zhaohua  Dai Shengqian  Li Kaiming
Abstract:Two types of Yanshanian igneous petrotectonic assemblages in East China are recognized: most of the igneous rocks is characterized by the continental marginal arc in petrology and ge-chemistry like Andes and west USA; and the Hercyn-type biotite-, two mica-, and muscovite granite belt is developed in the Nanling region . Three segments of Yanshanian igneous rocks a-long the belt have been recognized. In terms of the magma-tectonic event sequence, the north, middle and south segments have CCW, CW,and CCW + CW pTt path, respectively. The CW pTt path of the middle segment, indicated from the basaltic magma underplating after the crustal thickening, is believed to be a cause for the dominant developing of the shoshonitic rock assemblage. This paper suggests that, the Andes-like orogenic belt resulted from the lithosphere de- lamination (loss of about 120 km continental lithosphere root) in combination with the oceanic subduction, and the Hercyn-type Nanling orogenic belt is formed due to both the lithosphere and the crust thickening. Thus, the orogenic belt of Ease China in Yanshanian is believed to be a composite orogenic belt of continental marginal and continental collision orogeny.
keywords:Yanshannian igneous petrotetonic assemblge,orogenic-deep processes,CCW/ CW pTt path,
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