地球学报2017，Vol.38Issue(2)：193-207,15.DOI:10.3975/cagsb.2017.02.12
吉林红旗岭富家矿床矿石矿物化学和硫同位素特征——对铜镍硫化物矿床成因及成矿过程的约束
Mineral Chemistry and Sulfur Isotopic Characteristics of Ores from the Fujia Deposit in Hongqiling Area, Jilin Province: Constraints on the Genesis and Ore-forming Processes of Ni-Cu Sulfide Deposit
摘要
Abstract
Systematic studies of mineral chemistry and sulfur isotope of the ore minerals were carried out at the Fujia deposit in Hongqiling area,Jilin Province.Coexisting ore minerals mainly consist of pyrrhotite (Po),pentlandite (Pn),chalcopyrite (Cp) and pyrite (Py).The pyrrhotite includes monoclinic pyrrhotite (Mpo),hexagonal pyrrhotite (Hpo) and troilite (Tr),with the Mpo (a low temperature polymorphism) being dominant.The pentlandite evolved from Pn(1) via Pn(2) to Pn(3),whereas the pyrite varied in the sequence of Py(1)→Py(2)→Py(3)→Py(4) at the same mineralization stage.The pyrite-pyrrhotite mineral thermometry shows that the mineralizing temperatures of the ore minerals vary between 500℃ and 300℃,while the mineralizing sequence is approximately Pn→Po→Cp→Py.Sulfur isotopic characteristics show that the variation of δ34S values is relatively small (from-4.70‰ to +2.40‰),and statistics of the values fit tower-style distribution between -2.5‰ and +2.5‰,which indicates that sulfur of metal sources of this deposit was derived from the mantle with only a slight crustal contamination.In addition,the δ34S values show δ34SPo＞δ34Ssulfide＞δ34Spy,indicating that sulfur reached equilibrium in ore-forming melt.In combination with characteristics of the orebodies in the field and ore fabric,the authors hold that the ore-forming materials were principally derived from the upper mantle.Magmatic liquation was the major mineralization process,combined with obvious magmatic hydrothermal superimposition.The deposit is conduit-type mineralization,which can be explained by intrusion of deep ore-bearing magma and magma liquation-conduit-style mineralization.关键词
矿物化学/硫同位素/矿床成因/成矿过程/岩浆铜镍硫化物矿床/红旗岭Key words
mineral chemistry/sulfur isotope/ore genesis/ore-forming process/magmatic Ni-Cu sulfide deposit/Hongqiling分类
天文与地球科学引用本文复制引用
吕林素,李宏博,周振华,徐立国,杨小男,毛冰..吉林红旗岭富家矿床矿石矿物化学和硫同位素特征——对铜镍硫化物矿床成因及成矿过程的约束[J].地球学报,2017,38(2):193-207,15.基金项目
本文由国土资源部部门预算项目(编号:121113000000160034)资助.This study was supported by Departmental Budget of Ministry of Land and Resources of the People's Republic of China (No.121113000000160034). （编号:121113000000160034）
