乳山胡家口金矿中基性脉岩成因及与金矿化关系

Petrogenesis of Intermediatebasic Dykes and their Relation to Gold Mineralization in Hujiakou Gold Deposit in Rushan of Shandong Province

摘要:

胡家口金矿是牟平乳山金成矿带内一小型矿床，研究程度低。该文对胡家口金矿区及外围发育的中基性脉岩进行岩石学和地球化学研究，进一步探讨脉岩与金矿化的关系。研究表明，胡家口金矿及外围发育的中基性脉岩主要为煌斑岩和辉石闪长玢岩。主量元素显示，二者总体属玄武质安山岩；微量元素方面，二者均富集大离子亲石元素和轻稀土，而亏损高场强元素；稀土元素总量高，表现为轻稀土富集，重稀土亏损的右倾特征。综合研究认为，中基性脉岩（尤其是煌斑岩）和金矿化都属于幔源CHO流体分异演化不同阶段的产物。

Abstract:

Hujiakou gold deposit is a small ore deposit within Muru metallogenic belt, and has the low degree of research. In this paper, petrology and geochemistry of intermediatebasic dykes from Hujiakou gold field and the development of peripheral base are studied, and further explore the relationship between intermediatebasic dykes and gold mineralization. Studies have shown that Hujiakou gold and the development of peripheral intermediatebasic dykes are mainly lamprophyre and pyroxene diorite porphyrite. According to main elements, and the overall basaltic andesite; enrichment of trace elements, both large ion lithophile elements and light rare earth, and the loss of high field strength elements; high amount of rare earth elements, characterized by light rare earth concentration, heavy rare earth right characteristics of the loss. It is considered that the intermediatebasic dykes (especially the lamprophyre) and the gold mineralization were resulted from the differentiation of the mantlederived CHO fluids of different stages.