【摘要】 利用ELA-ICP-MS分析技术对冈底斯斑岩铜矿带冲江及驱龙含矿斑岩体进行锆石U-Pb年龄测定,所得到的年龄分别为14.0±0.2Ma和17.0±0.2Ma。两个含矿岩体锆石ELA-ICP-MSU-Pb年龄和SHRIMP年龄在误差范围内基本一致。冲江含矿斑岩体成岩成矿可分为两期,每期成岩成矿时间跨度约1Ma;驱龙含矿斑岩体成岩成矿时间跨度约为1Ma。更多还原

【Abstract】 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.更多还原