黑龙江东安金矿床成矿机理  

Metallogenic mechanism of the Dong'an gold deposit in Heilongjiang

作　　者：敖贵武[1] 刘智明[1] 薛明轩[1] 裴志霞[2] 汪长生[1] 陈海明[1] 姜迎久[1] 

机构地区：[1]黑龙江省有色金属地质勘查七0七队,黑龙江绥化152054 [2]黑龙江省鸡西矿业集团公司培训中心,黑龙江鸡西158100

出　　处：《黄金地质》2004年第1期15-19,共5页Gold Geology

摘　　要：东安金矿床是与中生代火山 潜火山岩有关的浅成低温热液型,产于乌底河断陷盆地中的库尔滨凹陷与宝山隆起带衔接部位,靠近隆起带一侧。成矿初始深度为0 2～1 0km,属浅—超浅成环境。成矿的最佳温度为260～300℃,矿石Rb Sr等时线年龄为108Ma,成矿物质主要来源于新元古代变质中酸性火山 沉积建造,成矿流体来源于岩浆水,后期有大气降水不断加入。成矿流体在向浅部运移过程中,从基底新元古界一面坡群额头山组变质中酸性火山 沉积建造中萃取成矿物质和介质,由于大气降水的不断加入,流体混合和浅部减压作用使含矿流体沸腾,导致温度下降和隐爆作用发生,Au与大量的SiO2一起沉淀。The Dong'an gold deposit, an epithermal type gold deposit related to volcano-metavolcanic rocks,located in the areas connecting Cuerbin sag with Baoshan swell belt where the deposit occurs in the Wudi-River Fault Basin.The ore forming initial depth,ranging from 0.2 to 1.0 km, belongs to hypergene-super hypergene environment.The optimum temperature of the ore-forming ranges from 260　to 300　℃ and the Rb-Sr isochron age of ore is 108 Ma.The ore-forming matter mainly derives from the intermediate-acid volcano-sedimentary formation of Proterozoic Erathem,and,ore-forming fluid comes from magmatic water mixed unceasingly meteoric water later.In the process of migration towards upper construction the ore-forming fluid extract mineral matter and medium from metamorphic intermediate-acid volcano-sedimentary formation of Proterozoic Erathem,Ertoushan Set of Yimianpo Group.Thanks to the combination of the incessant adding of atmospheric water,fluid-mixing and decompression boiling in the shallow,results in temperature-decreasing and cryptoexplosion and causes Au and mass SiO_2 codeposit.

关 键 词：金矿床 成矿机理 成矿流体 成矿物质 黑龙江 

分 类 号：P618.51[天文地球—矿床学] P611[天文地球—地质学]