岩石矿物学杂志2024，Vol.43Issue(4)：956-972,17.DOI:10.20086/j.cnki.yskw.2024.0412
江西北武夷地区老虎洞铅锌矿床成因研究
Genesis of the Laohudong Pb-Zn deposit in the north Wuyi area in Jiangxi Province:Evidence from in situ trace element and sulfur isotope of sulfides
摘要
Abstract
The north Wuyi area in Jiangxi Province is located on the southern side of the Pingxiang-Guangfeng junction zone on the Qinhang mineralization belt.Multiple tectonic events and magmatic activities formed a complex geological structure pattern in this area,and metallogenic potential of copper and lead-zinc polymetallic deposits is enormous.However,due to the generally small scale and insufficient research of lead-zinc deposits in the northern Wuyi area of Jiangxi Province,there is a lack of in-depth understanding of material sources,metallogenic condi-tions,and deposit genesis.This paper takes Laohudong Pb-Zn deposit in the northern Wuyi area of Jiangxi Prov-ince as the research object.EPMA,LA-ICP-MS and LA-MC-ICP-MS were used to reveal the major and trace ele-ment and sulfur isotope composition of sulfides,then many important information concerning the mineralization tem-perature,the source of metallogenic materials and the genesis of the deposit were investigated.EPMA testing shows that the Fe content in sphalerite ranges from 7.58％to 8.27％.Combined with LA-ICP-MS trace element testing,sphalerite is rich in Fe,Mn,Cu,Cd elements,followed by Co,Ni,Ag,In and Pb elements,the contents of Ga,Ge,As,Se,Sn and Bi elements are low.In sphalerite,Mn,Fe,Cd,In and Co exist in the form of isomorphism,while Cu,Ag,Pb exist in the form of isomorphism and microscopic inclusions.The content of Fe,the values of Ga/In(0.001～0.129),Zn/Cd(262～312)and calculation results of relevant formulas of sphalerite all indicated that sphalerite was formed under medium to high temperature mineralization conditions(about 327～337℃).Theδ34S of sphalerite and pyrite respectively concentrated between 2.07‰～4.16‰ and 0.82‰～3.19‰,they all indi-cated magmatic sulfur.Compared with multiple Pb-Zn deposits in China,the trace element composition of sphaler-ite in Laohudong Pb-Zn deposit is consistent with typical skarn deposits.The Laohudong Pb-Zn deposit has a close genetic relationship with the Gexianshan granite complex,and the age of Gexianshan granite complex(153.9±2.7 Ma and 162.8±1.2 Ma)can represent the lower limit of the mineralization time,which is consistent with the range of the main polymetallic Pb-Zn deposits in the north Wuyi area.关键词
闪锌矿/微量元素/硫同位素/原位分析/矽卡岩型矿床/老虎洞铅锌矿床/江西北武夷地区Key words
sphalerite/trace elements/sulfur isotope/in situ analysis/skarn deposit/Laohudong Pb-Zn deposit/the north Wuyi area of Jiangxi Province分类
天文与地球科学引用本文复制引用
范诗妮,朱云,李桂贤,石得凤,贾梦洁..江西北武夷地区老虎洞铅锌矿床成因研究[J].岩石矿物学杂志,2024,43(4):956-972,17.基金项目
国家自然科学基金项目(42102083) （42102083）
江西省煤田地质局2021年科研项目 National Natural Science Foundation of China(42102083) （42102083）
Research Project of Jiangxi Geological Bureau(2021) （2021）
