西藏一个与火山-次火山岩有关的金矿——林周县森布棍巴金矿点

森布棍巴金矿产于新生代林子宗群火山-次火山岩中，矿体主要产于次火山岩体及其与围岩的内外接触带中，火山机构是重要控矿构造，也是主要赋矿构造.对矿化石英脉和蚀变围岩的H、O和S、Pb等同位素地球化学的初步分析表明，成矿流体主要为火山-次火山热液，矿质主要来源于地幔深部，流体包裹体表现出弱酸性的中温特征，矿床成因上应属于中温火山-次火山热液交代构造破碎蚀变岩型金矿床

A GOLD DEPOSIT RELATED TO VOLCANIC-SUBVOLCANIC ROCKS IN SENBUGUNBA, LINZHOU COUNTY, TIBET

Senbugunba gold deposit occurs in the volcanic-subvolcanic rocks of Cenozoic Linzizong group.The main orebodies lie within the subvolcanic rock itself or in the inside and outside contact zones between the subvolcanic rock and wall rock.The volcanic apparatus serves as the important ore-control structure,and the host of ore as well.By elementary analysis of H,O,S and Pb isotopic geochemistry for the samples from the mineralized quartz veins and altered wall rock,it is obvious that the ore-forming fluid is volcanic-subvolcanic hydrothermal solution.The ore-forming substance may originate from deep of the mantle.The fluid inclusion shows moderate temperature feature with weak acidity.Thus,its ore genesis can be subjected to moderate temperature volcanic-subvolcangene hydrothermal replacement tectonoclastic altered rock gold deposit.