投稿时间：2012-07-01
修订日期：2012-08-20
中文摘要:大东沟铅锌矿位于新疆阿尔泰南缘的克兰盆地,赋存于康布铁堡组上亚组火山-沉积岩系,矿体直接围岩为变质钙质砂岩及不纯的大理岩,矿体呈层状、似层状、透镜状分布,与地层产状一致。利用LA-ICP-MS锆石U-Pb测年法,获得矿区2件康布铁堡组上亚组变质流纹岩加权平均年龄分别为(388.9±3.2) Ma(MSWD=3.3)和(400.7±1.6) Ma(MSWD=1.3)。结合前人的年龄数据,将克兰盆地康布铁堡组的时代厘定为晚志留世末期至早泥盆世(413~389 Ma)。大东沟铅锌矿为火山岩容矿的喷流沉积型矿床(VMS),2件变质流纹岩年龄限定大东沟铅锌矿的成矿作用发生在早泥盆世(401~389 Ma)。
Abstract:The Dadonggou Pb-Zn ore deposit is located in Kelan basin on the southern margin of Altay, Xinjiang. The ore-bearing country rock of the Dadonggou Pb-Zn ore deposit is volcanogene sedimentary rock of the Upper subformation of the Kangbutiebao Formatrion. The ore bodies occur in banded, bedded and lenticular forms, consistent with the stratigraphic attitude. LA-ICP-MS U-Pb zircon ages are reported for two meta-rhyolite samples from the Kangbutiebao Formation. The weighted mean 207Pb/206Pb ages of the two samples are(388.9±3.2) Ma(MSWD=3.3) and (400.7±1.6) Ma(MSWD=1.3). According to the results obtained by age data available, the Kangbutiebao Formation in Kelan basin should be of Late Silurian-Early Devonian period (413~389 Ma). The Dadonggou Pb-Zn ore deposit belongs to VMS-type, and the zircon LA-ICP-MS U-Pb data of the meta-rhyolite confine the formation of the Pb-Zn ore deposit to the Early Devonian (401~389 Ma).
keywords:geochemistry zircon LA-ICP-MS U-Pb data meta-rhyolite samples Dadonggou Pb-Zn deposit southern margin of Altay Xinjiang
文章编号：
中图分类号：P618.42;P618.43
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基金项目:本文得到公益性行业科研专项经费课题(编号200911007-06)和国家科技支撑计划专题(编号2006BAB07B02-01;2011BAB06B03-02)联合资助
引用文本：
耿新霞,杨富全,柴凤梅,刘敏,郭旭吉,郭正林,刘锋,张志欣.2012.新疆阿尔泰南缘大东沟铅锌矿区火山岩LA-ICP-MS锆石U-Pb定年及地质意义[J].矿床地质,31(5):1119~1131GENG XinXia,YANG FuQuan,CHAI FengMei,LIU Min,GUO XuJi,GUO ZhengLin,LIU Feng,ZHANG ZhiXin.2012.LA-ICP-MS U-Pb dating of volcanic rocks from Dadonggou ore district on southern margin of Altay in Xinjiang and its geological implications[J].Mineral Deposits31(5):1119~1131
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