地质学报2017，Vol.91Issue(12)：2739-2756,18.
河南省大河沟锑矿床构造—流体与低温成矿
The Low-Temperature Mineralization of Structurally-controlled Fluids in the Dahegou Antimony Ore Deposit, Henan Province
摘要
Abstract
The Dahegou Antimony ore deposit occurs mainly in the metamorphic rocks of Mesoproterozoic Qinling Group,with orebodies controlled by the Shuangkuishu deep fault and its nearby fractures.The deposit should belong to a structurally-controlled low-temperature hydrothermal deposit.In order to understand the relationship between mineralization structures and metallgenic element enrichment,and mineralization mechanism,we carried out a detailed study of tectonite using mineralogy,isotopic geochemical analysis and fluid inclusion testing.The results show that the distribution of the deposit is controlled by regional ductile shear zones.The mylonitizatioin occurred at 198.6 ± 4.74 Ma and mineralization elements sourced from deep earth.The stibnites were possibly formed under a single,closed environment,and are of typical peak features,and contain high concentrations of Au,Ag,Mo,Hg,Pb and Zn.Carbon and oxygen isotopes of calcite suggest a magma-mantle source.The δ34S values of stibnite range from 3.71‰ to 3.85‰,while lead isotopes of stratum lead show similar composition of that of stibnites.Composition analyses of fluid inclusions suggest that the fluids were mainly hydrothermally modified sedimentary brines consisting sulfate and locally bicarbonate type aqueous solutions.The mineralization occurred under reducing conditions.The mineralization occurred in the reducing condition.The high content of H2 in fluid inclusions of quartz indicates that the ore-forming fluids are characteristic of deep source.Integrated study indicates that the ore deposit formed from precipitation of metallic elements in the reducing and low-temperature condition,which were extracted from ductile shear zones when migrating along deep faulting.Therefore,the Dahegou antimony deposit can be determined a structurefluid-controlled metamorphic deposit.关键词
辉锑矿/低温成矿/成矿流体/地球化学/秦岭北部Key words
Stibnite/Low-temperature mineralization/Ore-forming fluid/Geochemistry/Northern Qinling引用本文复制引用
徐进鸿,张正伟,杨晓勇,张建军,史海松,吴承泉,郑超飞..河南省大河沟锑矿床构造—流体与低温成矿[J].地质学报,2017,91(12):2739-2756,18.基金项目
本文为国家自然科学基金项目(编号41573039,U1603245)资助的成果. （编号41573039,U1603245）
