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Discovery of Caledonian Mafic Rocks in Southwestern Hunan-northern Guangxi Border Area and Its Geological Significance

ZHU An-han;QIN Xiao-feng;WANG Zong-qi;GONG Jiang-hua;HUANG Jie;SONG Jiong;YANG Wen;WEN Jian-sheng;College of Earth Science,Guilin University of Technology;Guangxi Key Laboratory of Hidden Metallic Ore Deposits Exploration,Guilin University of Technology;China Institute of Mineral Resources,Chinese Amdemy of Geological Sciences;Guangxi Institute of Regional Geological Survey;  
The southwestern Hunan-northern Guangxi border area is an important part of the southwestern segment of Jiangnan orogenic belt( so-called Qinzhou-Hangzhou joint belt).There is a very strong magmatic activity related to the assembly and break-up of Rodinia supercontinent,but Caledonian mafic rocks have not been found in this area.Geochronology of Caledonian metamorphic gabbro-diabase discovered firstly in southwestern Hunan-northern Guangxi border area was studied by using LA-ICP-MS zircon U-Pb method.The research results showed that the metamorphic gabbro-diabase is developed during( 421.9 ± 7.8) Ma,and it is the product of Caledonian magmatism activity.The discovery of Caledonian mafic rock and the determination of its era,and in combination with the regional research results,we consider that there was likely a double ocean-continent subduction-collision event occurred during Neoproterozoic to early Paleozoic time.
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