鲁西铜石岩体金成矿规律和成矿预测  

Metallogenetic Rules and Prediction of Gold Deposits Around Tongshi Complex,Western Shandong Province

作　　者：张原庆[1] 宋炳忠[1,2] 王玉福[1] 张宁[1,3] 

机构地区：[1]吉林大学综合信息矿产预测研究所,长春130026 [2]山东省鲁南地质勘察院,山东济宁272100 [3]山东省第一地质勘察院,济南270085

出　　处：《吉林大学学报（地球科学版）》2010年第6期1287-1294,共8页Journal of Jilin University：Earth Science Edition

基　　金：国土资源部重点项目(121201633901)

摘　　要：铜石杂岩体是鲁西地区金成矿最活跃的岩体。根据岩性、产状、构造、地球物理场、地球化学场特征综合分析,可以将该区的岩石地层划分为与金矿床作用完全不同的4个构造层:泰山群老基底,高密度、低跳跃磁场、富金,金的矿源之一;古生代构造层,高密度、弱磁场、贫金,和成矿无成因联系,但可作为金成矿的载体;中新生代构造层,低密度、低磁场、贫金,和金成矿、找矿无关;铜石杂岩体,低密度、中高跳跃磁场、富金,金的主要来源、成矿动力源和找矿标志。铜石杂岩体演化主要有4个阶段:玢岩阶段、斑岩阶段、隐爆角砾岩阶段和脉岩阶段。金矿化强度随岩体的演化逐步提高,主要金矿化在成岩以后的热液阶段,地球化学元素组合是Au、Ag、V、Sb、Cr。重磁场和地球化学场解译结果,围绕铜石杂岩体存在3个环带,预测主要成矿带在岩体的边缘带和外环带,在边缘带以寻找中低温热液型矿床为主,在外环带以寻找甚低温热液矿床为主。The Tongshi complex is the most actively metallogenetic for gold mineralization in western Shandong Province. Around it there are four tectonic strata units with different lithological characters, occurrences, geophysical and geochemical features. The Taisban Group characterized by high density, low skipping magnetic field and high gold content can play as gold source. The Paleozoic unit, high density, weak magnetic field and poor in gold, is ore-forming media. The Mesozoic- Cenozoic unit is of low density, low magnetic field as well as poor in gold, which is irrelative to gold mineralization. Whereas, the Tongshi complex, with low density, medium-high skipping magnetic field and rich gold, is the main gold source, dynamic source and forecasting clue. The complex underwent such four stages as porpbyrite, porphyry, exploding breccia and dyke, the gold mineralization became intensive with its evolution. By analysis on tectonics, geochemistry and feasibility of every tectonic units around the complex, the conclusion can be drawn that the major gold mineralization took place in the hydrothermal stage at the end of diagenesis and assemble of elements include Au, Ag, V, Sb, Cr. According to gravimetrie, magnetic and geochemical anomalies, three zones can been determined around the Tongshi complex. The main gold resource in marginal zone mainly come from mid-low temperature hydrothermal deposits, and from epithermal gold deposits in outer zone. Both can form the marginal and outer metallogenetic zones around Tongshi complex.

关 键 词：成矿规律 异常 预测 金矿床 铜石岩体 

分 类 号：P578.11[天文地球—矿物学]