| 东秦岭栾川铅锌银矿田辉长岩锆石SHRIMP U-Pb年龄及成矿时代 |
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| 引用本文： | 包志伟,李创举,祁进平.东秦岭栾川铅锌银矿田辉长岩锆石SHRIMP U-Pb年龄及成矿时代[J].岩石学报,2009,25(11):2951-2956. |
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| 作者姓名： | 包志伟 李创举 祁进平 |
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| 作者单位： | 中国科学院广州地球化学研究所成矿动力学重点实验室,广州,510640 |
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| 基金项目： | 国家重点基础研究发展计划，国家自然科学基金 |
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| 摘 要： | 东秦岭栾川地区是著名的钼钨和铅锌多金属矿田.矿田内铅锌银矿床的成因及其与晚中生代构造岩浆活动关系一直存在诸多争论,其症结之一就是缺少可靠的同位素定年数据.铅锌银矿床赋存于中-晚元古代浅变质碳酸盐建造,野外地质观察发现碳酸盐-硫化物脉体及细粒黄铁矿呈细脉或浸染状沿辉长岩裂隙分布.辉长岩中锆石为无色透明柱状晶体,阴极发光图像显示清晰的震荡韵律环带,SHRIMP U-Pb年龄为147.5±1.7 Ma,MSWD=1.5.根据铅锌矿脉与辉长岩穿插关系,断定成矿作用晚于辉长岩结晶年龄,即不早于147.5±1.7 Ma.
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| 关 键 词： | 辉长岩 铅锌银矿 晚中生代 栾川 东秦岭 |
SHRIMP zircon U-Pb age of the gabbro dyke in the Luanchuan Pb-Zn-Ag orefield, east Qinling orogen and its constraint on mineralization time |
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| BAO ZhiWei,LI ChuangJu,QI JinPing.SHRIMP zircon U-Pb age of the gabbro dyke in the Luanchuan Pb-Zn-Ag orefield, east Qinling orogen and its constraint on mineralization time[J].Acta Petrologica Sinica,2009,25(11):2951-2956. |
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| Authors: | BAO ZhiWei LI ChuangJu QI JinPing |
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| Abstract: | Luanchuan area,located in eastern Qinling orogen,is famous for its Mo-W and Pb-Zn-Ag mineralizations.The Pb-Zn-Ag mineralization and its relationship with the intensive late Mesozoic tectonic-magmatic activities have long been a debate issue,which mostly due to lack of precise isotopic ages.The Pb-Zn-Ag deposits are mainly hosted in the Mesoproterozoic to Neoproterozoic carbonate strata,and field observation shows that the coarse-grained carbonate-sulfide veins and fine-grained pyrite occur along the fractures of gabbro dykes.The zircons from the gabbro are colorless prism crystals showing clear magmatic oscillatory zoning and are dated at 147.5 ±1.7 Ma(MSWD = 1.5)by SHRIMP U-Pb method.Considering the geological relationship of the gabbro and the ore-veins,the vein-type Pb-Zn-Ag mineralization is undoubtedly postdate the intrusion of the gabbro,i.e.,the vein-type Pb-Zn-Ag mineralization in Luanchuan area took place no earlier than 147.5±1.7 Ma. |
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| Keywords: | Gabbro Pb-Zn-Ag mineralization Late Mesozoic Luanchuan East Qinling |
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