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《Geotectonica Et Metallogenia》 2006-04
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COMPARISON OF ELA-ICP-MS AND SHRIMP U-PB ZIRCON AGES OF THE CHONGJIANG AND QULONG ORE-BEARING PORPHYRIES IN THE GANGDESE PORPHYRY COPPER BELT

MO Jihai 1,2 , LIANG Huaying1, YU Hengxiang3, XIE Yingwen1 and ZHANG Yuquan1 (1. Guangzhou Institute of Geochemistry, Chinese Academy of Sciences, Guangzhou, GD 510640, China; 2. Graduate School, Chinese Academy of Sciences, Beijing 100039, China; 3. Guilin Institute of Technology, Guilin, GX 541004, China)  
New zircon U-Pb ages of the Chongjiang and the Qulong ore-bearing porphyries in the Gangdese porphyry copper belt are analyzed by using ELA-ICP-MS dating technique. The ages for the early stages of both Chongjiang and the Qulong ore-bearing porphyries are 14.0±0.2 Ma and 17.0±0.2 Ma, respectively. Here the zircon ELA-ICP-MS U-Pb ages are similar to the SHRIMP U-Pb ages within error, suggesting that the ELA-ICP-MS method can be used to precisely date the ages of young zircon grains. The data also imply that the Chongjiang ore-bearing porphyry may undergo two stages of magma-ore-forming processes and the lifespan of each stage lasts about 1 Ma, and that the lifespan of the Qulong magmatic ore-formation system lasts about 1 Ma.
【Fund】: 国家自然科学基金项目(40472049);; 中国科学院广州地球化学研究所创新项目(GIG-CX-040-03)资助.
【CateGory Index】: P597.3
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