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《Geological Review》 2005-01
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Formation Age of the Intermediate-basic Dikes and Volcanic—Intrusive Complex in Xiangshan, Jiangxi Province

FAN Honghai 1),WANG Dezi 2),SHEN Weizhou 2),LIU Changshi 2),WANG Xiang 2), LING Hongfei 2) 1) Beijing Research Institute of Uranium Geology,Beijing,100029 2) Department of Earth Sciences, Nanjing University, Nanjing, 210093  
U-Pb isotopic dating of single-grain zircons indicates that there is another emplacement event of subvolcanic rhyodacitic porphyry with an age of 136.0±2.6 Ma in the contact zone of the two volcanic cycles in the western part of the Xiangshan complex. Granitic lumps in the central-facies porphyroclastic lava belong to subvolcanic rocks with a formation age of 134.2±1.9 Ma. The U-Pb ages of the postvolcanic secondary quartz-monzonite porphyry and lamprophyre veins are 129.5±2.0 Ma and 125.1±3.1 Ma, respectively. This suggests that the extension and splitting in the Xiangshan region began in K 1, which are obviously earlier than those in the coastal regions of Zhejiang and Fujian provinces.
【Fund】: “973”项目 (编号 G19990 43 2 11);; 国家自然科学基金重点项目 (编号 40 13 2 0 10 );; 南京大学成矿作用国家重点实验室开放基金资助成果
【CateGory Index】: P588.1;P597.3
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