地球学报2024，Vol.45Issue(4)：530-546,17.DOI:10.3975/cagsb.2024.051501
云南金沙厂铅锌矿床地球化学特征及其指示意义
Geochemical Characteristics and Indication Significance of Jinshachang Lead-zinc Deposit,Yunnan Province
摘要
Abstract
The Sichuan-Yunnan-Guizhou lead-zinc ore cluster at the southwest margin of the Yangtze Plate is an important part of the large area of low-temperature metallogenic field in southwest China.The Jinshachang lead-zinc deposit is one of the typical deposits in the Sichuan-Yunnan-Guizhou lead-zinc ore cluster.Some studies have been carried out on the sources of metals and the characteristics of ore-forming fluids in the Jinshachang lead-zinc deposit.However,the contribution of surrounding rocks to mineralization and the genesis of the deposits are still unclear.In view of this problem,trace element compositions of sphalerite and surrounding rocks in the deposit were systematically analyzed.According to the REE characteristics of surrounding rocks and fluorite,the contribution of the surrounding rocks to mineralization was discussed and the genesis of the deposit was determined.The study shows that sphalerite is characterized by high Cd,Ge,Cu and Ga contents and low Fe,Mn,In,Co and Ni content,which are mainly formed and enriched in sphalerite due to isomorphous substitution.The contents of elements such as Cu and Ge vary greatly,which may be related to the low-temperature fluid.The multicolor sphalerite from the deposit may be attributed to the synergistic effect of Cu,Ge,As,Ag and other elements.The surrounding rocks near the ore-forming end are enriched in Zn,Pb,Ba,Cd and other elements,which are also enriched in the sphalerite,indicating that the surrounding rocks provide some metallic elements for mineralization.Fluorite inherits the negative Eu and Ce anomalies of the surrounding rocks and is affected by the ore-forming fluids with highly negative Ce anomalies.The fluorite has a higher Y/Ho ratio than the surrounding rock,indicating that part of the Y in fluorite originates from the surrounding rock,resulting in the fluorite having a higher Y/Ho ratio.Overall,the sulfur trace element composition of sphalerite in this deposit is consistent with that of MVT type deposits,which is obviously different from exhalative sedimentary deposits,magmatic hydrothermal deposits and distant source skarn-type deposits.The metallogenic temperature belongs to the low-temperature range.Combined with the geological and geochemical characteristics of the deposit,this study inferred that the Jinshachang lead-zinc deposit belongs to the MVT Pb-Zn deposit.关键词
金沙厂铅锌矿床/闪锌矿/围岩/微量元素和稀土元素/矿床成因Key words
Jinshachang Pb-Zn deposit/sphalerite/surrounding rock/trace elements and rare earth elements/genesis of mineral deposit分类
天文与地球科学引用本文复制引用
刘聿栋,昂文,安鹏,李杨林,孔志岗,张长青,李芬,王昱..云南金沙厂铅锌矿床地球化学特征及其指示意义[J].地球学报,2024,45(4):530-546,17.基金项目
本文由云南省科技计划项目高层次科技人才及创新团队选拔专项(编号:202305AT350004-5)、云南省科技计划项目(编号:202202AG050006-5)、企业基础研究应用基础研究联合专项(编号:202101BC070001-003)和国家重点研发计划项目(编号:2017YFC0602502)联合资助. This study was supported by Science and Tech-nology Plan Project of Yunnan Province(Nos.202305AT350004-5,202202AG050006-5,and 202101BC070001-003),and National Key Research&Development Program of China(No.2017YFC0602502). （编号:202305AT350004-5）
