SHRIMP Zircon U-Pb Dating of Gabbro and Granite from the Huashan Ophiolite,Qinling Orogenic Belt,China: Neoproterozoic Suture on the Northern Margin of the Yangtze Craton  

作　　者：SHI Yuruo LIU Dunyi ZHANG Zongqing MIAO Laicheng ZHANG Fuqin XUE Hongmei 

机构地区：[1]Beijing SHRIMP Center, Institute of Geology, Chinese Academy of Geological Sciences, Beijing 100037 [2]Institute of Geology and Geophysics,Chinese Academy of Sciences, Beijing 100029 [3]No. 4 Geological Team, Xinjiang Bureau of Geology and Mineral Resources, Altay, Xinjiang 836500

出　　处：《Acta Geologica Sinica(English Edition)》2007年第2期239-243,共5页地质学报（英文版）

基　　金：the National Natural Science Foundation of China （Grant No. 40234045, 40473030）.

摘　　要：The recently identified Huashan ophiolitic mélange was considered as the eastern part of the Mianlüe suture in the Qinling orogenic belt. SHRIMP zircon U-Pb geochronology on gabbro from the Huashan ophiolite and granite intruding basic volcanic rocks indicates crystallization ages of 947±14 Ma and 876±17 Ma respectively. These ages do not support a recently proposed Hercynian Huashan Ocean, but rather favor that a Neoproterozoic suture assemblage （ophiolite） is incorporated into the younger （Phanerozoic） Qinling orogenic belt.The recently identified Huashan ophiolitic mélange was considered as the eastern part of the Mianlüe suture in the Qinling orogenic belt. SHRIMP zircon U-Pb geochronology on gabbro from the Huashan ophiolite and granite intruding basic volcanic rocks indicates crystallization ages of 947±14 Ma and 876±17 Ma respectively. These ages do not support a recently proposed Hercynian Huashan Ocean, but rather favor that a Neoproterozoic suture assemblage （ophiolite） is incorporated into the younger （Phanerozoic） Qinling orogenic belt.

关 键 词：SHRIMP NEOPROTEROZOIC OPHIOLITE Huashan Mianlüe Suture QINLING 

分 类 号：P588.12[天文地球—岩石学] P535.2[天文地球—地质学]