胶西北河东金矿床岩石化学特征与成矿机理分析
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摘要
河东金矿床位于望儿山断裂中段。河东金矿床岩石化学分析显示,郭家岭型花岗闪长岩和玲珑型花岗岩在钾化蚀变过程中均有K、Na、C等元素的显著带入及Fe、Ca、Mg等元素的显著带出;黄铁绢英岩化蚀变过程中有K、Fe、Mg等元素的明显带入和Na、Ca等元素的显著带出;黏土化蚀变过程有Si、Na等元素的显著带出和Mg、Al等元素的带入;钾化花岗闪长岩和花岗岩中ΣREE和LREE/HREE比值均显著降低。钾化带、黄铁绢英岩化带及黏土化带之间有明显的物质交换。河东金矿床成矿作用和水岩反应可以概括为动态成矿与相应的水岩反应机制,热液对流过程中物理化学条件的动态变化是制约水岩反应和成矿物质活化—迁移—聚集的关键,水的电离反应是蚀变矿化过程的重要环节之一。
Hedong Gold Deposit was located in the middle part of Wang'ershan fault zone. According to the lithochemistry testing,K,Na and C were carried in significantly and Fe,Ca and Mg were brought out obviously during potash feldspathization of Guojialing granodiorite and Linglong granite; K,Fe,Mg were carried in and Na,Ca were brought out during beresitization; Si,Na were brought out and Mg,Al were carried in during clayization. ΣREE and LREE / HREE ratio decreased in potash feldspathization of granodiorite and granite. Matter exchange was obvious within potash feldspathization zone,beresitization zone and clayization zone. The mineralization and water- rock interaction in Hedong Gold Deposit were generalized as dynamic mineralization and correlative water- rock interaction mechanism. The dynamic change of physical and chemical conditions was the key of controlling the water- rock interactions and the activation,migration and accumulation of ore-forming materials. Ionization reaction of water was one of the most important parts in the alteration and mineralization process.
Hedong Gold Deposit was located in the middle part of Wang'ershan fault zone. According to the lithochemistry testing,K,Na and C were carried in significantly and Fe,Ca and Mg were brought out obviously during potash feldspathization of Guojialing granodiorite and Linglong granite; K,Fe,Mg were carried in and Na,Ca were brought out during beresitization; Si,Na were brought out and Mg,Al were carried in during clayization. ΣREE and LREE / HREE ratio decreased in potash feldspathization of granodiorite and granite. Matter exchange was obvious within potash feldspathization zone,beresitization zone and clayization zone. The mineralization and water- rock interaction in Hedong Gold Deposit were generalized as dynamic mineralization and correlative water- rock interaction mechanism. The dynamic change of physical and chemical conditions was the key of controlling the water- rock interactions and the activation,migration and accumulation of ore-forming materials. Ionization reaction of water was one of the most important parts in the alteration and mineralization process.
引文
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[2]谢荣举,彭省临.岩石钾质变化及钾交代与成矿关系[J].大地构造与成矿学,1998,22(3):274-279.
[3]陈德稳,孙涛,张爽,等.河西金矿床钾化蚀变与矿化的关系初探[J].长春工程学院学报(自然科学版),2009,10(3):79-82.
[4]陈海燕,李胜荣,张秀宝,等.胶东金青顶金矿床围岩蚀变特征与金矿化[J].矿物岩石地球化学通报,2012,31(1):5-13.
[5]吕承训,吴淦国,陈小龙,等.新城金矿蚀变带构造与地球化学特征[J].地构造与成矿学,2011,35(4):618-627.
[6]安芳,朱永峰.热液金矿成矿作用地球化学研究综述[J].矿床地质,2011,3(5):799-814.
[7]吕古贤,林文蔚,郭涛,等.金矿成矿过程中构造应力场转变与热液浓缩-稀释作用[J].地学前缘,2001,8(4):253-264.
[8]丁式江,翟裕生,邓军.胶东焦家金矿蚀变岩中元素的质量迁移[J].地质与勘探,2000,36(4):28-31.
[9]陈国达.中国大地构造概要[M].北京:地震出版社,1977:29-30.
[10]刘家远.胶东金矿与地洼花岗岩[J].大地构造与成矿学,1992,16(2):175-176.
[11]翟明国,范宏瑞,杨进辉,等.非造山带型金矿——胶东型金矿的陆内成矿作用[J].地学前缘,2004,11(1):85-98.
[12]苗来成,罗镇宽,黄佳展,等.山东招掖金矿带内花岗岩类侵入体锆石SHRIMP研究及其意义[J].中国科学(D辑),1997,27(3):207-213.
[13]孙林,杨斌,郭建军,等.胶东金矿集区硫和碳的循环与控矿作用[J].矿产与地质,2006,20(2):97-101.
[14]杨斌,赖健清,彭省临,等.动态成矿作用与找矿[M].北京:地质出版社,2014:1-8.