Zircon LA-ICP-MS U-Pb ages of granites at Dabaoshan polymetallic deposit and its geological significance, Guangdong, South China |
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Dabaoshan polymetallic deposit is located at the middle part of the Nanling granite belt, South China, which is a famous large deposit with a long history of mining. Much attention has been paid to the Mesozoic magmatism because recent research reveals that Mo(W)-ore related porphyries are the product of Yanshanian magmatism, while little effort has been done on the other stage magmatism. Based on the previous study, zircon LA-ICP-MS U-Pb dating has been conducted on different stage granites and mafic dykes in order to systematically clarify the magmatic activity of the studied area. The weighted average Pb-206/U-238 age of Xuwu rhyolitic porphyry is 426.9 +/- 2. 2Ma, and the weighted average Pb-206/U-238 ages are 162.2 +/- 0. 7Ma, 160.2 +/- 0. 9Ma and 161.2 +/- 0. 9Ma for Jiuquling granodiorite porphyry, Chuandu granodiorite and Dabaoshan granodiorite porphyry, respectively. Two mafic dykes recorded two magmatic events of 210. 4 +/- 1. 4Ma and 163. 9 +/- 1. 8Ma, respectively. Therefore, it is proved that the Dabaoshan area has gone through a multiple magmatic activity including Caledonian, Indosinian and Yanshanian. Middle-Late Jurassic mafic magma might have contributed to the Dabaoshan polymetallic mineralization. Publication name | ACTA PETROLOGICA SINICA Volume: 29 Issue: 12 Pages: 4104-4120 Published: 2013 | Author(s) | Mao Wei; Li XiaoFeng; Yang FuChu | Corresponding author | MAO Wei dzmaowei@163.com 1. Chinese Acad Sci, Inst Geochem, State Key Lab Ore Deposit Geochem, Guiyang 550002, Peoples R China 2. Univ Chinese Acad Sci, Beijing 100049, Peoples R China | View here for the details
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