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中文摘要：
马家洼金钼矿床位于小秦岭北缘,矿体发育在由近东西向脆韧性断裂构造带控制的石英脉中。对该矿床辉钼矿样品进行的Re-Os同位素年代学研究表明：模式年龄范围是232.5～268.4 Ma,等时线年龄为（232±11）Ma,即钼成矿作用时代为早、中三叠世。辉钼矿样品的Re含量范围是（0.474～0.791）×10（-6）,初始（187）Os/（188）Os比值为2.4±6.4,Re-Os同位素组成特征指示了成矿物质主要来源于地壳。马家洼石英脉型金钼矿床是区域伸展体制下构造-流体成矿事件的产物。在华北板块南缘太古宙基底岩系中的脆韧性断裂构造带中寻找印支期和燕山期石英脉型金钼矿床和钼矿床是一个新的找矿方向。
英文摘要：
The Majiawa Au-Mo deposit discovered in recent years is located in the north margin of the Xiaoqin-ling gold area.The orebodies,the Au-Mo-bearing quartz veins,are controlled by east-west-trending brittle-ductile fault belts.Precise Re-Os dating of molybdenite from the Majiawa Au-Mo deposit has been carried out in this study,and the results show that the Re-Os model ages range from 232.5 Ma to 268.4 Ma with a Re-Os isochron age of（231±11）Ma,indicating the molybdenum mineralization occurred in the Triassic.The rhenium contents of molybdenite samples range from 0.474×10（-6）to 0.791×10（-6）,and the initial （187）Os/（188）Os is of 2.4±6.4,which indicate that ore-forming materials were derived from the crust.The Majiawa quartz vein type of Au-Mo deposit was a product of tectonic-fluid metallogenic event in the regional extensional regime.It is a new prospective to explore the Indosinian and Yanshanian quartz vein type of Au-Mo and Mo deposits within brittle-ductile fault belts developed in Archean basement at the south margin of the North China plate.
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