藏东各贡弄铜金多金属矿床地质特征及其成因初探  

GEOLOGICAL CHARACTERISTICS AND METALLOGENESIS OF THE GEGONGNONG POLYMETALLIC COPPER-GOLD DEPOSIT IN THE EASTERN TIBET

作　　者：丁枫[1] 唐菊兴[1] 黄卫 陈生华[1] 张金树 

机构地区：[1]成都理工大学地球科学学院,成都610059 [2]西藏地矿厅地质六队,拉萨850000

出　　处：《地质找矿论丛》2005年第1期15-20,共6页Contributions to Geology and Mineral Resources Research

基　　金：中国地质调查局国土资源大调查项目(编号:19991020012003)资助。

摘　　要：藏东各贡弄铜金多金属矿床工业价值巨大。矿区有燕山期和喜山期岩浆岩侵位于下三叠统马拉松多组地层中,喜山期石英二长斑岩与成矿关系密切。产于斑岩体内的矿体呈筒状,产于接触带夕卡岩中的矿体呈似层状。岩石地球化学反映出岩体围岩中富集的成矿元素来自于斑岩体,接触带附近矿化元素的变化与岩石的破碎程度,蚀变强度呈正相关关系。矿床同位素分析表征了流体的深源特征,并在成矿过程中有大气水的参入。矿床为斑岩型多金属矿床。Gegongnong polymetal copper-gold deposit is of great industrial value. Himalayan intrusion in the mine district emplaced in the lower Triassic Malasongduo formation and the quartz monzonitic porphyre is closely related to the ore. Ore bodies take shape of pipes in the porphyre and those in the skarn at contact zone occur as layered ore bodies. The petrochemistry and geochemistry show that the concentrated ore elements in the host rock are derived from the porphyre. The ore element concentration is positively corvelated to fragmentation and alteration. The isotope compositions are characterized by deep source and incorperation of meteoritic water. The deposit is a porphyric Cu-Au polymetal ore deposit.

关 键 词：各贡弄铜金属矿 地质特征 微量元素 同位素 斑岩型矿床 西藏自治区 

分 类 号：P611[天文地球—矿床学] P618.4[天文地球—地质学]