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）。
The Dadonggou Pb-Zn ore deposit is located in Kdan 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 sub- formation of the Kangbutiebao Formatrion. The ore bodies occur in banded, bedded and lenticular forms, con- sistent with the stratigraphic attitude. LA-ICP-MS U-Pb zircon ages are reported for two meta-rhyolite samplesfrom the Kangbutiebao Formation. The weighted mean 207pb/206 Pb 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 avail- able, 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）.
出处
《矿床地质》
CAS
CSCD
北大核心
2012年第5期1119-1131,共13页
Mineral Deposits
基金
公益性行业科研专项经费课题(编号200911007-06)
国家科技支撑计划专题(编号2006BAB07B02-01
2011BAB06B03-02)联合资助
