岩石矿物学杂志2018，Vol.37Issue(2)：241-258,18.
西藏浦桑果铅锌多金属矿床矽卡岩矿物学特征及其地质意义
Mineralogical characteristics of skarn in the Pusangguo Pb-Zn polymetallic deposit of Tibet and their geological significance
摘要
Abstract
The Pusangguo lead-zinc polymetallic deposit is located in the volcanic-magma arc of the southern Gangdise metallogenic belt,Tibet.The skarn type orebodies mainly occur in nearly bedded and lenticular shapes in nearly east-west direction and are hosted in the skarnized marble of the Cretaceous Takena Formation,with lots of skarn minerals developed in this deposit.In order to further identify the species of skarn minerals and types of the skarn and analyze the formation environment of the skarn and its relationship with mineralization types,the authors analyzed the chemical composition of the skarn minerals by using the electron microprobe technology and on the basis of the systematic microscope observation.According to the results obtained,the garnet is mainly composed of discontinuous isomorphism of andradite and grossular (And47 39 ～98.17 Gro0.59 ～50.22 Ura + Pyr + Spe0 ～ 3.53),the clinopyroxene is mainly composed of hedenbergite-johannsinite-diopside (Hd37.91 ～74.16Jo0.91 ～61.66Di0.43～46.07),the pyroxenoid is mainly wollastonite,and the endmember compositions are Wo99.09～99.26 En0.50～0.56 Fs0.13～0.24.In addition,the hornblendes are mainly magnesium hornblendes and have the features of calcium hornblende,the epidote is relatively enriched in aluminum and calcium but poor in iron and magnesium,and the chlorite belongs to the type of pycnochlorite.The skarn mineral assemblage characteristics indicate that the skarns in the Pusangguo deposit have the features of both calcium-skarn and manganese-skarn.At the early stage of skarn mineralization,the skarns were mainly formed under the conditions of high temperature,pH,oxygen fugacity,and the ore-forming fluid had high oxygen fugacity.Manganese skarn mineral characteristics and the single silver minerals show that this deposit has the silver ore prospecting potential,which can serve as the next step prospecting direction in the future exploration.关键词
铅锌矿/钙质矽卡岩/锰质矽卡岩/浦桑果/西藏Key words
lead-zinc deposit/calcium skarn/manganese skarn/Pusangguo/Tibet分类
天文与地球科学引用本文复制引用
李壮,唐菊兴,王立强,李海峰,刘文元..西藏浦桑果铅锌多金属矿床矽卡岩矿物学特征及其地质意义[J].岩石矿物学杂志,2018,37(2):241-258,18.基金项目
国家自然科学基金项目(41403040) （41403040）
中国地质调查局地质调查项目(12120113036200,12120114050901) National Natural Science Foundation of China (41403040) （12120113036200,12120114050901）
Project of China Geological Survey(12120113036200,12120114050901) （12120113036200,12120114050901）
