焦家式金矿构造-流体成矿作用特征——以胶西北金城金矿床为例  

TECTONICS MINERALIZATION OF JIAOJIA TYPE GOLD DEPOSITS——An Example from Jincheng Gold Deposit, Northwestern Jiaodong Peninsula

作　　者：李厚民[1] 沈远超[2] 毛景文[1] 刘铁兵[2] 

机构地区：[1]中国地质大学(北京)地球科学与资源学院 [2]中国科学院地质与地球物理研究所,北京100029

出　　处：《大地构造与成矿学》2002年第4期396-403,共8页Geotectonica et Metallogenia

基　　金：本文得到中国科学院黄金九五重大项目"山东重要金成矿区的成矿模式及找矿预测"(KZ951-A1-404-02-02);中国科学院创新工程项目"金矿资源战略接替基地若干靶区预测"(KZCX1-Y-03-01)资助.

摘　　要：焦家式金矿形成于从韧性构造到脆性构造的转折期,金城金矿床乃至焦家金矿田控矿构造从早到晚经历了左行韧性逆冲、右行脆性张剪、右行脆性压剪和正断层四个活动阶段。成矿作用从早到晚可分为5个阶段,石英钾长石阶段发育于韧性变形前,与围岩玲珑花岗岩有较大时差而与主成矿阶段时间相近,为成矿初期;石英铁碳酸盐黄铁矿阶段、石英黄铜矿阶段和黄铁绢英岩阶段为主成矿阶段,发生于脆性构造环境,前二者形成于右行张剪环境,后者在各个阶段均不同程度发育,但以右行压剪阶段最重要;碳酸盐阶段为成矿末期。Jiaojia type gold deposits are formed during tectonic transition from ductile to brittle. The metallogenetic tectonics activities of Jincheng gold deposit as well as Jiaojia gold orefield have 4 sequential stages: counterclockwise ductile thrust, clockwise brittle tensile shear, clockwise brittle compressive shear and normal fault. Mineralization has 5 stages. Quartz k feldspar stage is before ductile shear and is the first stage of mineralization, for it is close to main metallogenetic stages but has a long interval with the Linglong granite. Quartz siderite pyrite stage, quartz chalcopyrite stage and pyrite sericite quartz stage are the main metallogenetic ones and are formed under brittle tectonic settings. The former two stages are formed under clockwise brittle tensile shear setting while the latter is mainly formed under clockwise brittle compressional shear setting though could be formed in many tectonic stages. Carbonate stage shows the end of mineralization.

关 键 词：构造 成矿作用 期次 金矿 金城 胶东 

分 类 号：P618.51[天文地球—矿床学]