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江西银山多金属矿床蚀变绢云母^(40)Ar-^(39)Ar年龄及其地质意义 被引量:37

^(40)Ar/^(39)Ar dating of sericite from altered dacite porphyry and quartz porphyry in Yinshan polymetallic deposit of Jiangxi Province and its geological significance
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摘要 江西银山矿床是一个与火山_次火山热液有关的多金属矿床。文章通过对该矿床九区与铜金矿化有关的蚀变英安斑岩和石英斑岩中绢云母的40Ar-39Ar快中子活化年龄测试,获得蚀变英安斑岩中绢云母的坪年龄和等时线年龄分别为(178.2±1.4)Ma和(179.6±2.9)Ma;蚀变石英斑岩中2件绢云母样品的坪年龄和等时线年龄分别为(175.4±1.2)Ma和(175.3±1.1Ma),(176.2±5.1)Ma和(176.6±3.3)Ma。这些数据表明,银山多金属矿床铜金矿化的成矿时代为175~180Ma。该成果的获得对于进一步认识德兴地区乃至华南地区中生代的地球动力学背景具重要意义。 The Yinshan polymetallic deposit in jiangxi Province is a hydrothermal vein-type deposit closely related to Late jurassic felsic-intermediate volcanic-subvolcanic activities. The second stage of Cu-Au mineralization is associated with dacite porphyry. Sericites from dacite porphyry and quartz porphyry in the Cu-Au ore zone were analyzed by the ^40Ar-^39Ar fast-neutron activation dating technique, and the results yielded the plateau age and the isochron age of ( 178.2 ± 1.4) Ma and ( 179.6 ± 2.9) Ma respectively in altered &cite porphyry, and ( 175.4 ± 1.2) Ma and ( 176.2 ± 5.1 ) Ma, (175.3 ± 1.1) Ma and ( 176.6 ± 3.3) Ma respectively in altered quartz porphyry. It is held that the Cu-Au mineralization in the Yinshan deposit took place in 175 ~ 180 Ma, resulting from the tectonic extension related to multiple lithospheric extension in South China.
出处 《矿床地质》 CAS CSCD 北大核心 2006年第1期17-26,共10页 Mineral Deposits
基金 国家自然科学基金青年项目(40403006) 国家自然科学基金重点项目(40434011) 中国博士后资助金(2003033209)的资助
关键词 地质学 ^40Ar-^39Ar快中子活化测年 蚀变英安斑岩 蚀变石英斑岩 银山多金属矿床 德兴 江西 geology, ^40Ar-^39Ar fast-neutron activation dating, altered dacite porphyry, altered quartz porphyry, Yinshan polymetallic deposit, Dexing, Jiangxi Province
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