马家窑金矿床位于栖霞—蓬莱成矿带上，矿体赋存在新太古代的变质侵入岩中，控矿构造为马家窑—上庄头断裂的次一级断裂构造。结合马家窑金矿床地质特征，碳酸盐岩的碳、氧同位素组成特征显示成矿流体为幔源流体；含金石英脉中的金属硫化物硫同位素组成特征显示其以幔源硫为主，部分为壳源硫。因此认为，成矿物质可能主要来自地幔，部分来自地壳。成矿期前闪斜煌岩的修正年龄结果显示闪斜煌岩形成于燕山晚期早白垩世，由此推断马家窑金矿床也形成于这一时期。马家窑金矿床地质特征和同位素组成与山东栖霞山城金矿床相似，为典型的中温热液脉型金矿床。
@@@@The Majiayao gold deposit,located in Qixia-Penglai metallogenic belt,occurs in the Neoarchaean meta-morphic intrusive rocks and is controlled by secondary fault of Majiayao-Shangzhuangtou.With the consideration of the geological features of the deposit ,the carbon and oxygen isotopic characteristics of carbonatites show that ore-forming fluids were sourced from mantle,and the sulfur isotopic characteristics of the metal sulfides in auriferous quartz veins has mixed characteristics of main mantle-derived sulfur and part of crust-derived sulfur,so that the ore-forming materi-als maybe mainly derived from mantle,and partly derived from crust.The corrected age of camptonite in the early min-eralization period show that the camptonite formed in the Early Cretaceous ,Late Yanshanian.The paper believes that Majiayao gold deposit also formed in this period .The geological features and the isotopic compositions of the Majiayao gold deposit are similar to those of the Shancheng gold deposit in Qixia City ,Shandong Province.Hence the Majiayao gold deposit can be genetically attributed to the mesothermal gold deposit .
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