中文摘要：

张三沟金矿区位于中亚 兴蒙造山带东段,是该造山带上一个较为重要的金矿区,其研究程度较低.为厘定赋矿岩浆岩的成岩时代并限定其成矿时代,本文对主要赋矿的斜长花岗斑岩和宁远村组英安岩进行了锆石U-Pb LA-ICP-MS同位素定年,获得其成岩年龄分别为106.2±1.2 Ma和104.2±1.4 Ma,说明二者可能是同期、同源岩浆在演化的不同阶段先后喷出和侵入的产物.早白垩世是东北地区乃至整个中国东部地区岩浆活动的高峰期,此时期区内爆发了大规模的成矿作用,张三沟金矿即为此期岩浆热液活动的产物.期间受太平洋板块俯冲作用的影响,区域上处于拉张伸展构造环境中,加厚岩石圈的拆沉作用导致软流圈上涌并发生底侵,最终形成同时期的广泛的岩浆活动并诱发大量的成矿作用.

英文摘要：

The Zhangsangou gold deposit is located in the most eastern part of the Central Asian orogenic belt,is an important gold deposit,but there is rarely research on this deposit.The results of LA-ICP-MS zircon U-Pb dating give weighted average ages of plagiogranite porphyry and dacites from the Ningyuancun Formation 106.2±1.2 Ma and 104.2±1.4 Ma,respectively,indicating that they were different effusive and intruded products of a co-stage and co magmatic evolution.Large scale mineralization occurred in the Early Cretaceous,which was a peak period of magmatic activities in NE China and even eastern China.The Zhangsangou gold deposit was the product of magmatic thermal activity in this period.The region experienced the conditions of lithospheric extension-thinning,resulted from subduction of the Pacific plate.The delamination of the lithosphere caused by asthenosphere upwelling and magmatic underplating,which produced extensive coeval magmatic activity and induced mineralization.