胶西北大尹格庄金矿区青磐岩化与金成矿关系
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摘要
大尹格庄金矿区位于招平断裂带中段,矿区围岩蚀变分带现象明显,其中青磐岩化蚀变带呈面状分布于胶东群变质岩中。岩矿鉴定、X射线微区衍射分析及电子探针分析显示,该矿区青磐岩化蚀变岩的典型蚀变矿物组合为钠长石-赤铁矿(磁铁矿)-绿泥石-斜黝帘石-金红石-方解石,显示矿区青磐岩化蚀变形成于高氧逸度、偏碱性物理化学条件。大尹格庄金矿区水岩反应与成矿作用可以表述为电解-电离机制,即金离子在阴极获得电子而聚集成矿。青磐岩化蚀变带则为阳极,也是金成矿的主要物源区和活化区之一。水的电离作用是水岩反应与成矿的关键制约因素之一。
The Dayingezhuang Gold District is located in the middle section of the Zhaoping fault zone. Alteration zonation of surrounding rocks in the district is distinct. The propylitization alteration is in planar distribution in the metamorphic rocks of Jiaodong Group. According to rock-mineral identification,micro-area X-ray diffraction analysis and electron probe analysis,the typical mineral assemblage of propylitization is albite-magnetite (hematite)-chlorite-clinozoisite-rutile-calcite,and the propylitization alteration is formed in high oxygen fugacity and alkaline physicochemical conditions. The water-rock interaction and mineralization in the Dayingezhuang Gold District could be expressed as an electrolysis-ionization mechanism,in which gold acquires electrons at the cathode and aggregates into ore,whereas propylitization alteration zone,as the anode,provides the main material of gold mineralization in activation zones. The ionization of water is a key constraint to hydrothermal reaction and mineralization.
The Dayingezhuang Gold District is located in the middle section of the Zhaoping fault zone. Alteration zonation of surrounding rocks in the district is distinct. The propylitization alteration is in planar distribution in the metamorphic rocks of Jiaodong Group. According to rock-mineral identification,micro-area X-ray diffraction analysis and electron probe analysis,the typical mineral assemblage of propylitization is albite-magnetite (hematite)-chlorite-clinozoisite-rutile-calcite,and the propylitization alteration is formed in high oxygen fugacity and alkaline physicochemical conditions. The water-rock interaction and mineralization in the Dayingezhuang Gold District could be expressed as an electrolysis-ionization mechanism,in which gold acquires electrons at the cathode and aggregates into ore,whereas propylitization alteration zone,as the anode,provides the main material of gold mineralization in activation zones. The ionization of water is a key constraint to hydrothermal reaction and mineralization.
引文
[1]杨敏之,吕古贤.胶东绿岩带金矿地质地球化学[M].北京:地质出版社,1996.
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[12]张振海,张景鑫,叶素芝.胶东招—掖金矿带金矿化蚀变带RbSr等时线的研究及测定[J].贵金属地质,1993,2(1):26-34.
[13]刘建明,叶杰,徐九华,等.初论华北东部中生代金成矿的地球动力学背景—以胶东金矿为例[J].地球物理学进展,1990,1(1):39-46.
[14]肖武权,戴塔根.试论胶东金成矿区金矿的形成条件[J].华北地质学院学报,1994,17(3):219-225.
[15]张竹如.胶东群变质岩系[J].贵州工学院学报,1994,23(3):20-32.
[16]李洪志,吴悦斌.胶东绿岩带镁铁质岩地质地球化学特征的研究[J].地质与勘探,1994,30(6):60-63.
[17]曲晓明,王鹤年,饶冰,等.胶东群部分熔化实验及其对花岗岩成因的指示[J].地球化学,2000,29(2):153-161.
[18]涂光炽.中国层控矿床地球化学:第一卷[M].北京:科学出版社,1984.
[2]吕古贤,孔庆存.胶东玲珑—焦家式金矿地质[M].北京:科学出版社,1993.
[3]沈保丰,骆辉,李双保,等.华北陆台太古宙绿岩带地质及成矿[M].北京:地质出版社,1994.
[4]罗镇宽,关康,王曼祉,等.中国金矿床概论[M].天津:天津科学技术出版社,1993.
[5]杨敏之,吕古贤.胶东绿岩带金矿地质地球化学[M].北京:地质出版社,1996.
[6]丁世江,翟裕生,邓军.胶东地区地质体含金性的地质地球化学评价[J].地质找矿论丛,1997,12(3):1-10.
[7]王国明.论胶东群地层与胶东金矿之关系(金的物质来源问题讨论)[J].黄金地质科技,1986(1):21-33.
[8]王鹤年,陈骏,汪耀,等.胶东金矿含金建造的地球化学研究[J].地球化学,1988,17(3):195-208.
[9]陈振胜,张理刚,刘敬秀,等.胶东区域岩石铅同位素地球化学背景研究[J].地质找矿论丛,1994,9(1):65-78.
[10]毛景文,赫英,丁悌平.胶东金矿形成期间地幔流体参与成矿过程的碳氧氢同位素证据[J].矿床地质,2002,21(2):121-128.
[11]CATHELINCAU M,NIEVA D. A chlorite solid solution geothermometer the Los Azufres(Mexico)geothermalsystem[J]. Contributions to Mineralogy and Petrology,1985,91(3):235-244.
[12]张振海,张景鑫,叶素芝.胶东招—掖金矿带金矿化蚀变带RbSr等时线的研究及测定[J].贵金属地质,1993,2(1):26-34.
[13]刘建明,叶杰,徐九华,等.初论华北东部中生代金成矿的地球动力学背景—以胶东金矿为例[J].地球物理学进展,1990,1(1):39-46.
[14]肖武权,戴塔根.试论胶东金成矿区金矿的形成条件[J].华北地质学院学报,1994,17(3):219-225.
[15]张竹如.胶东群变质岩系[J].贵州工学院学报,1994,23(3):20-32.
[16]李洪志,吴悦斌.胶东绿岩带镁铁质岩地质地球化学特征的研究[J].地质与勘探,1994,30(6):60-63.
[17]曲晓明,王鹤年,饶冰,等.胶东群部分熔化实验及其对花岗岩成因的指示[J].地球化学,2000,29(2):153-161.
[18]涂光炽.中国层控矿床地球化学:第一卷[M].北京:科学出版社,1984.