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内蒙古新地沟金矿床产于大青山太古宙花岗岩-绿岩带中,受色尔腾山群柳树沟组中基性火山岩系和韧性剪切带控制。容矿岩石主要是变安山质-英安质火山岩类。为解决主矿体的形成时代,采用石英40Ar/39Ar法,直接测定了含金石英细脉浸染状矿石中石英的形成时代,结果表明新地沟金矿的形成时代为1991.43~1988.93M a。由此提出新地沟金矿的成因主要与吕梁期韧性剪切带中的变质变形作用有关。
The Xindadiou gold deposit in Inner Mongolia is produced in the Archean granitic-greenstone belt of Daqingshan and controlled by the mid-basic volcanic rocks and ductile shear zones of the Williteng Formation in the Serteng Mountains. The ore-bearing rocks are mainly of the Ananthan-Yingan volcanic rocks. In order to solve the forming age of the main ore body, quartz 40Ar / 39Ar method was used to directly determine the formation time of quartz in the disseminated gold ore-bearing quartz vein. The results show that the formation time of Xindihang gold deposit is 1991.43 ~ 1988.93Ma. It is concluded that the genesis of Xindihang gold deposit is mainly related to the metamorphism and deformation in the ductile shear zone of Luliang stage.