藏北班—怒成矿带中生代浅变质岩系与金矿成矿  

The relationship of Mesozoic epimetamorphic rock series and the gold mineralization in Bangong Lake to Nujiang River mineralized belt, northern Tibet, China

作　　者：路彦明[1] 卫万顺[1] 刘桂阁[1] 范俊杰[1] 

机构地区：[1]武警黄金地质研究所,河北廊坊065000

出　　处：《黄金地质》2002年第3期14-19,共6页Gold Geology

摘　　要：本区中生代浅变质岩系中产出众多的岩、砂金矿床 (点 ) ,矿床在空间上具有明显的层控性。岩系的原岩成分、元素地球化学特征、成岩环境差别较大 ,反映了区内强烈的构造变动环境。对Au等 9个成矿元素相关分析表明 ,已知的岩金矿 (化 )点没有完全继承围岩的元素组合特征。易释放Au含量计算结果、矿床O同位素组成等研究表明 ,岩系可提供部分矿源 ,层间构造是成矿的有利空间。浅变质岩系是金矿成矿的有利赋矿岩系 ,其出露区是成矿的有利地区。There are many rock and placer gold deposits occurred in the Mesozoic epimetamorphic rock series in Bangong Lake to Nujiang River mineralized belt, they appear strata-bound characters in space. The difference of protolith composition, geochemical features of the element and diagenetic environment of the rock series reflect the strong tectonic event in this area. Correlation analysis to Au and other 8 ore-forming elements shows that the known gold deposit spot hasn't inherited the characteristics of elements assemblage of the wall rocks completely. Study on Oxygen isotope composition of deposits, and calculating on the easy released gold content show that the rock series could supplies part of ore resource and the interstratified structure was the favorable space to the mineralization. The epimetamorphic rock series is the favorable host rock series of gold mineralization and its outcropped place is the favorable area of gold mineralization.

关 键 词：金矿床 浅变质岩系 层控 中生代 西藏 

分 类 号：P618.51[天文地球—矿床学]