吉林省红旗岭矿区3号含矿岩体同位素年龄研究

Isotopic age of No.3 ore-bearing rock mass of Hongqiling mining area in Jilin Province

通过对红旗岭矿区3号含矿岩体同位素年龄研究，该岩体锆石U-Pb年龄为（207±3）Ma，黑云母Ar-Ar年龄为（212.5±2.5）Ma，矿石Re-Os等时线年龄为（234±28）Ma，表明该含矿岩体形成于三叠纪晚期。该年龄和近年来对含矿基性-超基性岩体同位素年龄测定结果基本一致（205-230 Ma），说明它们均为三叠纪晚期岩浆作用的产物。根据岩体围岩年龄（Rb-Sr全岩等时线年龄（524±16）Ma和（357±23）Ma），认为该岩体成岩成矿主要形成于印支中晚期，是同一期构造岩浆活动的产物，岩浆及成矿物质来源具有同源性，从而形成了具有相同成因的矿床类型。

Through study on isotope age of No.3 ore-bearing rock mass in Hongqiling mining area, the zircon U-Pb age 207±3Ma, biotite Ar-Ar age 212.5±2.5Ma, ore Re-Os isochrones age 234±28Ma, which show that the ore-bearing rock mass formed in Late Triassic. The age are basically same with the ore-bearing basic-ultrabasic rock isotopic age determination results in recent years （205Ma - 230Ma）, that show they are the products of the Late Triassic magmatism. According to the ages of wall rock （Rb-Sr whole rock isochron age 524±16Ma and 357±23Ma） . We think that rock mass diagenetic mineralizationare mainly formed in the Late Indosinian, is the product of the same period tectonic magmatic activity. Magma and ore-forming material have homology sources, thus deposit types of the same genesis are formed.