黑龙江二十一站金、铜矿床地质特征及成矿模式
Geological Characteristics and Metallogenic Model of Ershiyizhan Gold and Copper Deposits in Heilongjiang Province
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摘要: 二十一站矿床的金矿体与铜矿体在分布的空间位置和展布方位上差异明显。金矿体分布于二十一站岩体西南接触带,呈北西向展布;铜矿体分布于二十一站岩体内,呈北东向展布。笔者通过对黑龙江塔河二十一站金、铜矿地质特征的分析,讨论了矿床的成矿控制因素,提出了二十一站金、铜矿分别是不同成矿期、不同成因类型产物的观点。二十一站金、铜矿是壳幔源混合岩浆经一定分异作用后,3次侵位固结成岩。在第一侵入期花岗闪长岩体内、外接触带的构造有利部位形成金矿体,在第二侵入期花岗闪长斑岩周围形成铜矿体。Abstract: The gold and copper orebodies of the Ershiyizhan deposits are different in terms of their spatial distribution. The gold bodies,in a northwestern extension,are located in the southwestern contact of the intrusive,while the copper orebodies are centered inside the intrusive and stretch northeast. Based on the geological features of the Ershiyizhan gold copper deposits,this paper studies the controls factors and proposes a metallogenic model for the deposits:the gold and copper deposits belong to different products of different genesis type and metallogenic periods. The mineralization-related intrusive was emplaced in three times after magmatic differentiation of the crust-mantle mixed magmas.
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