云南卓玛铅锌矿床地球化学特征及矿床成因  

Geochemical characteristics and genesis of the Zhuoma lead-zinc deposit in Yunnan Province

作　　者：金灿海[1] 范文玉[1] 张海[1] 沈战武[1] 张玙[1] 高建华[1] 

机构地区：[1]中国地质调查局成都地质调查中心,四川成都610081

出　　处：《中国地质》2013年第6期1902-1911,共10页Geology in China

基　　金：中国地质调查局地质矿产调查专项项目(1212011120608)资助

摘　　要：云南卓玛铅锌矿位于义敦岛弧南端的中甸弧,矿体产于印支期石英二长斑岩中,受断裂破碎带控制。通过对非矿斑岩、碎裂斑岩矿石、脉状矿石的稀土元素及矿石方铅矿硫、铅同位素的研究,表明非矿斑岩与矿石的稀土元素地球化学特征相似,矿石与斑岩同源。方铅矿的δ34S变化范围为-0.01‰^-2.90‰,为幔源岩浆硫,铅同位素206Pb/204Pb为18.0959~18.1119,207Pb/204Pb为15.6118~15.6191,208Pb/204Pb为38.2515~38.2918,矿石铅主要来自造山环境,源区属于以幔源铅为主的壳幔混合源。矿区铅锌矿化富集与印支晚期卓玛复式斑岩体密切相关,矿床属受断裂破碎带控制的岩浆热液充填-交代型矿床。The Zhuoma lead-zinc deposit is located in the southern segment of the Indosinian Yidun-Zhongdian island-arc belt. The ore body occurs in the Indosinian quartz monzonite porphyry and is controlled by faulted zones. Studies of REE of non-ore porphyry （porphyrite）, fragmentation-porphyry ore, vein ore and sulfur and lead isotopes of ore galena show that RASE geochemical characteristics of porphyry （porphyrite） and ores are similar to each other, and ores and porphyry （porphyrite） were from the same source. Galena δ 34S values range from-0.01 to-2.90‰, indicating that sulfur was derived from the mantle, lead isotopic ratios of ^206Pb/^204Pb vary from 18.0959 to 18.1119, ^207pb/^204pb from 15.6118 to 15.6191, and ^208Pb/^204Pb from 38.2515 to 38.2918, suggesting that lead of ores was derived from an orogenic environment, with the source area belonging to mixed crust-mantle source dominated by mantle lead. Lead-zinc mineralization in the ore district was closely related to the late Indosinian Zhuoma duplex porphyry （porphyrite）, and the ore deposit belongs to magmatic hydrothermal filling metasomatic type controlled by fractures.

关 键 词：卓玛铅锌矿 地球化学 矿床成因 云南 

分 类 号：P618.4[天文地球—矿床学]