Relationship between Granite and Eclogite on the Southern Margin of the Qilian Mountains: Evidence from Zircon SHRIMP Agesof the Aolaoshan Granite

作     者：吴才来 Jone WOODEN YANG Jingsui Trevor IRELAND LIOU June Guang Wan Yusheng Shi Rendeng 

作者机构：Institute of Geology CAGS Beijing 100037 Department of Geology Stanford University Stanford CA 94305-2115 USA 

出 版 物：《Acta Geologica Sinica(English Edition)》 (地质学报（英文版）)

年 卷 期：2002年第76卷第1期

页      面：118-125页

核心收录：

学科分类：0709[理学-地质学] 081803[工学-地质工程] 07[理学] 08[工学] 0818[工学-地质资源与地质工程] 

主　　题：zircon SHRIMP age Aolaoshan granite ultrahigh-pressure metamorphic belt south margin of the Qilian Mts 

摘      要：Zircon SHRIMP ages of the Aolaoshan granite on the south margin of the QilianMts. range from 445 + - 15.3 to 496 + - 7.6 Ma (averaging 473 Ma), belonging to the EarlyOrdovician. Geochemically, the granite is similar to I-type granite and, tectonically, was formed inan island-arc environment based on relevant diagrams for structural discriminations. Consideringalso the regional geology, the authors suggest that the granite is part of an ultrahigh-pressurebelt on the south margin of the Qilian Mts. and that its formation bears a close relationship tothis belt.