广西王社铜钨矿床的Re-Os同位素年龄及其地质意义
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Re-Os Isotopic Ages of Molybdenite from the Wangshe Copper-Tungsten Deposit in Guangxi Province and Their Implications
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    摘要:

    广西王社铜钨矿床主要类型是斑岩铜钼矿,叠加有石英脉型黑钨矿,Cu、Mo和W都可利用,其中Cu的平均品位在0.3%以上。本文利用ICP-MS测试技术获得高精度的辉钼矿Re-Os同位素年龄值,结果表明,王社铜钨矿化模式年龄为94.9~96.3Ma,等时线年龄93.8±4.6Ma,属燕山晚期。与成矿有关的昆仑关岩体以黑云母花岗岩为主,及后期花岗斑岩墙穿插,岩石地球化学特征显示黑云母花岗岩SiO2含量68.6%~72.1%,花岗斑岩脉为73.8%;Al2O3含量前者为14.16%~14.75%,后者14.07%;全碱含量前者6.78%~8.15%,后者8.1%;且均显示出K2O>Na2O的特征。初步推断该成矿带燕山晚期的成岩成矿动力学背景为岩石圈伸展。

    Abstract:

    Wangshe deposit is located in Guangxi province. It is a Cu-W deposit associated with porphyry type copper and quartz vein-type tungsten related to Mesozoic granites. The molybdenite apparent Re-Os age is 94.9~96.3 Ma with an isochron age of 93.8±4.6Ma (n=6). Kunlunguan batholith is mainly composed of biotite granite cut by later granitic porphyry dykes. The SiO2 of the former is 68.6%~72.1%, and that of the latter is 73.8%; The Al2O3 of the former is 14.16%~14.75%, and that of the latter is 14.07%; The total alkaline of the former is 6.78%~8.15%, and that of the latter is 8.1%. We indicate that the geodynamic evolution of Late Yanshanian mineralization in this region is lower crustal delamination and lithospheric thinning.

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蔺志永.2008.广西王社铜钨矿床的Re-Os同位素年龄及其地质意义[J].地质学报,82(11):1565-1571.
linzhiyong.2008. Re-Os Isotopic Ages of Molybdenite from the Wangshe Copper-Tungsten Deposit in Guangxi Province and Their Implications[J]. Acta Geologica Sinica,82(11):1565-1571.

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  • 收稿日期:2008-07-16
  • 最后修改日期:2008-07-16
  • 录用日期:2008-11-24
  • 在线发布日期: 2008-11-24
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