Full-Text Search:
Home|Journal Papers|About CNKI|User Service|FAQ|Contact Us|中文
《地球科学》 1994-02
Add to Favorite Get Latest Update

Generation of Muscovite/Two-Mica Granite and Intracontinental Subduction

Deng Jinfu Zhao Hailing Lai Shaocong Liu Houxiang Luo Zhaohua (China University of Geosciences, Beijing 100083)  
This paper discusses the generation of muscovite/two-mica granite and their genetic relations to intracontinental subduction. The major constraints of the processes of muscovite granite for-mation, taking the Higher Himalaya for an example, are demostrated from multiple-aspect of geology, petrology, geochemistry, experimental petrology and geophysics. We suggest that the magma generales in the Main Central Thrust(MCT)(30~35km), and has higher temperature of 750~ 800℃, H2O-undersaturated and large capability to be emplacement in the sedimentary covers to form real igneous intrusion, rather than generates at the base of the thick-ened continental crust and has lower temperature of 600~650℃,H2O-saturated and less capability of emplacement to form intrusion in the situ/semi-situ.A reasonable model of thermal struc-ture of the intracontinental subduction zone is presented. Combining the possible material of magma source and the experimental relationship, we demonstrate in detail that the main magma source of the muscovite granite is the pelite of the top of the subducted slab at the adjacent region of the subduction end. In addition, the H2O-saturated and near-saturated granitic magmas are formed at the wedge corner of the overlying slab. A new important conclusion is that the development of muscovite granite is a main signature to recognize the intracontinental subduction zone.
【Fund】: 地矿部重大基础研究基金资助
【CateGory Index】: P588.1
Download(CAJ format) Download(PDF format)
CAJViewer7.0 supports all the CNKI file formats; AdobeReader only supports the PDF format.
©2006 Tsinghua Tongfang Knowledge Network Technology Co., Ltd.(Beijing)(TTKN) All rights reserved