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铜陵地区小铜官山石英闪长岩锆石SHRIMP的U-Pb年龄及其成因指示
SHRIMP U-Pb geochronology of Xiaotongguanshan quartz-dioritic intrusions in Tongling district and its petrogenetic implications
  
中文关键词:锆石U-Pb SHRIMP年龄 石英闪长岩 成因 铜官山 铜陵
英文关键词:SHRIMP U-Pb geochronlogy,quartz diorite,genesis,Tongguanshan,Tongling
基金项目:国土资源部国际合作与科技司重点项目 (2 0 0 1 0 2 0 9)
王彦斌  刘敦一  曾普胜  杨竹森  蒙义峰  田世洪
[1]中国地质科学院地质研究所北京离子探针中心,北京100037 [2]中国地质科学院矿产资源研究所,北京100037
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中文摘要:
      铜陵是我国著名的铜(金)、铁成矿带,其金属矿产与区内燕山期侵入岩有着密切的时空、成因联系。本文应用SHRIMP方法对小铜官山石英闪长岩中的锆石进行了U-Pb年龄测定,表明铜官山石英闪长岩形成于139Ma,这一年龄记录了与铜矿成矿作用有关的岩浆活动的时代。另外铜官山石英闪长岩中含有的残留锆石给出了太古宙-古元古代(2670~2025Ma)的年龄信息,表明基底岩石参与了铜官山石英闪长岩的形成,这与由Sr-Nd同位素示踪得出的结果一致,暗示区内石英闪长岩浆受到了古老地壳物质的混染,或前寒武纪岩石是其熔融源区的重要组成之
英文摘要:
      The quartz-dioritic intrusions in Tongguanshan of Tongling district, Anhui Province, are spatially and temporally associated with copper mineralization. Sensitive High Resolution Ion Microprobe (SHRIMP) U-Pb zircon dating of quartz diorites from Xiaotongguanshan in the Tongling ore district indicates felsic intrusive activity at 139~133 Ma, which also represents the copper mineralization epoch. Some of the zircon grains yield 207Pb/206Pb ages of (2 670~2 025) Ma, implying the involvement of the Precambrian metamorphic basement in the formation of quartz diorites. The presence of such zircon grains in these quartz diorites suggests that either the parental magmas were assimilated by basement rocks during the ascent of magma or the lower/middle crustal rocks served as one of the important components during the melting process.
王彦斌,刘敦一,曾普胜,杨竹森,蒙义峰,田世洪,2004,铜陵地区小铜官山石英闪长岩锆石SHRIMP的U-Pb年龄及其成因指示[J].岩石矿物学杂志,23(4):298~304.
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