胶东焦家金矿床钾长石成因及成矿意义

Origin and Metallogenic Significance of K-feldspar in Jiaojia Gold Deposit in Jiaodong Area

摘要:

焦家金矿属于蚀变岩型金矿，围岩蚀变发育，是我国储量最大的金矿床之一。该文对蚀变带中的钾长石的赋存状态、化学成分进行了分析研究，并与未蚀变的玲珑岩体中的钾长石进行对比。认为焦家金矿床主要存在三种成因类型的钾长石，即原生钾长石（岩浆成因）、高温热液钾长石、低温热液钾长石。结合前人的研究成果，探讨了热液钾长石的形成与成矿意义。

Abstract:

Jiaojia gold deposit belongs to altered rock type gold deposit, which has extensive wall rock alteration. It is one of the biggest gold deposit in reserves. Occurrence and chemical composition of the Kfeldspar in the alteration rock have been analyzed and studied, and compared with the Kfeldspar in the nonalterated Linglong rock bodies. Three genetic types of Kfeldspar occurred in Jiaojia gold deposit, including native Kfeldspar (magmatic origin), hydrothermal Kfeldspar of high temperature and hydrothermal Kfeldspar of low temperature. Finally, combining with previous research, the formation and its mineralization significance of the hydrothermal Kfeldspar have been discussed.