Indosinian Shahewan rapakivi granite in Qinling and its dynamic significance
Indosinian Shahewan rapakivi granite in Qinling and its dynamic significance
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DOI：
10.1360/yd1996-39-3-266
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发表时间：
1996-05
影响因子：
5.7
通讯作者：
Lu Xin-xiang;Dong You;Chang Qiuling;Xiao Qinghui;Li Xiaobo;Wang Xia;Zhang Guowei
中科院分区：
文献类型：
--
作者：
Lu Xin-xiang;Dong You;Chang Qiuling;Xiao Qinghui;Li Xiaobo;Wang Xia;Zhang Guowei
环斑花岗岩是世界上主要产于前寒武纪稳定地块中的造山后花岗岩。秦岭沙河湾环斑花岗岩。而印支末期（195-213 Ma）侵入造山带的年轻岩体则是罕见的。该岩体由角闪-石英二长岩和角闪-黑云二长岩组成，具有一系列独特的地质地球化学特征。它侵入于华北板块与扬子板块的主缝合带--商丹断裂带，是碰撞后岩石圈地幔拆沉的产物。沙河湾环斑花岗岩的出现标志着加里东-海西-印支俯冲-碰撞造山阶段的结束，并在造山晚期向陆内造山阶段过渡。
Rapakivi granite is a postorogenic granite mainly occurring within Precambrian stable blocks in the world. Shahewan rapakivi granite in Qinling. however, is a seldom seen young rock body occurring at the end of Indo-Chinese epoch (195-213 Ma) and intruding in an orogenic belt. This rock body consists of amphibole-quartz monzonite and amphibole-biotitc adamellite and shows a series of distinctive geological andgeochemical characteristics. It intruded in Shangdan faulted zone--the main suture belt between the NorthChina and Yangtze plates as a result of the delamination of the lithospheric mantle occurring after collision. Presence of Shahewan rapakivi granite marked the end of orogenic stage of subduction-collision from Caled-onian-Hercynian to Indo-Chinese epoch and the transition to intracontinental orogeny in the late orogenic stage.