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南秦岭下地壳组成及岩石圈的拆离俯冲作用
引用本文:路凤香 王春阳 胡宝群 吴其反,郑建平.南秦岭下地壳组成及岩石圈的拆离俯冲作用[J].中国地质,2003,30(2):113-119.
作者姓名:路凤香 王春阳 胡宝群 吴其反  郑建平
作者单位:1. 中国地质大学,湖北,武汉,430074
2. 东华理工学院,江西,抚州,344000
3. 清华大学工程物理系,北京,100084;国土资源部航空物探遥感中心,北京,100083
基金项目:国家重点基础研究发展规划项目(G1999075503),国土资源部地质大调查项目(20001010203)
摘    要:根据新提供的Pb同位素组成及岩石地球化学研究成果,本文进一步证实了位于北秦岭北界的明港地区发育的早中生代安山玄武质火山角砾岩岩筒所携带的下地壳捕虏体属于南秦岭。所恢复的南秦岭下地壳剖面自下而上为:底侵成因的变辉长岩-基性麻粒岩(其中含有榴辉岩及辉石岩的透镜体)-酸性麻粒岩。秦岭造山带总体的岩石因模型为:南秦岭(扬子块体)向北拆离俯冲,北秦岭地壳向华北仰冲,华北岩石因呈楔状插入秦岭造山带,拆离面约在中、下地壳之间。南秦岭俯冲岩片延伸的范围在平面上有可能达到400km。

关 键 词:下地壳  南秦岭  铅同位素  岩石地球化学  早中生代  捕虏体  岩石圈  拆离俯冲作用  角砾岩岩筒
文章编号:1000-3657(2003)02-0113-07

Structure of the lower crust and detachment and subduction of the lithosphere of the South Qinling
LUFeng-xiang,WANGChun-yang,HUBao-qun,WUQi-fan,ZHENGJian-ping.Structure of the lower crust and detachment and subduction of the lithosphere of the South Qinling[J].Chinese Geology,2003,30(2):113-119.
Authors:LUFeng-xiang  WANGChun-yang  HUBao-qun  WUQi-fan    ZHENGJian-ping
Institution:LUFeng-xiang1,WANGChun-yang1,HUBao-qun2,WUQi-fan3,4,ZHENGJian-ping1
Abstract:According to the lead isotopic composition and geochemical study o f rocks,this paper further verifies that the xenoliths of the lower crust carrie d by an Early Mesozoic andesite-basaltic breccia pipe developed in the Minggang area on the northern boundary of the North Qinling belong to the South Qinling.F rom below up-ward the reconstructed section of the lower crust below the South Qinling co nsists of underplating gabbro,basic granulite(which contains lenses of granulite and gabbro)and acid granulite.The general lithosphere model of the Qinling orog enic belt is as follows:the South Qinling crust(Yangtze block)is detached and su bducted northward,the North Qinling crust is obducted toward North China,and the lithosphere beneath North China is injected as a wedge into the Qinling orogeni c belt,with the detachment surface lying between the middle and lower crusts.In a plan view,the subducting slab of the South Qinling possibly extends400km until it reaches here.
Keywords:lower crust  lead isotopic composition  lithosphere  detachment-subduction
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