西藏龙根铅锌矿床二长花岗斑岩锆石U-Pb年代学和微量元素地球化学特征Ziron U-Pb Geochronology and Geochemical Characteristics of Trace Elements of the Monzonitic Granite Porphyry in the Longgen Pb-Zn Deposit,Tibet
张树志;郑有业;高顺宝;张永超;栾康;姜晓佳;
摘要(Abstract):
西藏龙根铅锌矿床位于中拉萨地体西部,是继查个勒铅锌多金属矿床之后,念青唐古拉铅锌银铜铁成矿带西段又一重要找矿突破。对龙根二长花岗斑岩进行了LA-ICP-MS锆石U-Pb年代学和微量元素地球化学研究,获得锆石~(206)Pb/~(208)U加权平均年龄为(62.9±0.8)Ma(MSWD=2.4,n=17),与念青唐古拉铅锌银铜铁成矿带东段亚贵拉铅锌钼矿床、中段纳如松多铅锌矿床和勒青拉铜钼铅锌矿床、以及西段的查个勒铅锌多金属矿床成岩年代相一致,均为印-亚板块同碰撞初期的产物。锆石Ti温度计估算出二长花岗斑岩中绝大部分锆石的结晶温度小于或等于680℃,推测岩浆来源于水近饱和条件下古老地壳的部分熔融。锆石微量元素特征表明龙根二长花岗斑岩形成于陆缘弧环境,具陆缘弧岩浆的特征。
关键词(KeyWords): 锆石U-Pb测年;锆石微量元素;锆石Ti温度计;龙根铅锌矿床;西藏
基金项目(Foundation): 中国地质调查局项目“西藏冈底斯成矿带西段关键科学技术难题研究与应用示范”(201511015);; “冈底斯西段火山岩区铜金锡多金属矿产调查”(DD2016027-2)
作者(Author): 张树志;郑有业;高顺宝;张永超;栾康;姜晓佳;
Email:
DOI: 10.19509/j.cnki.dzkq.2019.0303
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