知识与财富的链接
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 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).
