作　　者： (倪康）; (武彬）; (叶现韬）;

机构地区： 福建省闽西地质大队,厦门361000

出　　处： 《华东地质》 2017年第3期168-174,共7页

摘　　要： 阿尔金北缘喀腊大湾是阿尔金地区最著名也是最重要的Fe-Cu-Pb-Zn-Ag多金属矿集区。作为该矿集区的容矿地层,拉配泉组为一套火山—沉积岩组合,其时代一直没有获得较好的限定。本文通过对拉配泉组三段流纹岩进行LA-ICP-MS锆石U-Pb年龄测定,获得拉配泉组206 Pb/238 U加权平均年龄为488±2 Ma,应属于寒武系,而非奥陶系、震旦系或蓟县系。结合前人研究成果,认为拉配泉组形成于岛弧环境,对该矿集区成矿地质背景研究具有重要的科学意义。 The Kaladawan area in the northern margin of Altyn Tagh is the most important and famous Fe-Cu-Pb-Zn-Ag polymetallic ore cluster field in Altyn Tagh. The Lapeiquan Formation, as the ore- bearing stratum in the ore cluster area, consists of one set of volcanic-sedimentary rock assemblage, but its formation age has not been restricted. This study carried out LA ICP-MS zircon U-Pb dating for rhyolite from the third member of the Lapeiquan Formation. A weighted 206Pb/238U age of 488±2 Ma was obtained for the Lapeiquan Formation, indicating that the Lapeiquan Formation belongs to upper Cambrian, not Ordovician, Sinian or Jixian System. This finding, together with previous work, suggests that the Lapeiquan Formation formed in the continental arc setting. This study is of important scientific significance for understanding the metallogenetic and geological setting of the Kaladawan ore cluster area.

关 键 词： 拉配泉组 流纹岩 年龄 喀腊大湾矿集区 阿尔金北缘