矿床地质2017，Vol.36Issue(3)：595-610,16.DOI:10.16111/j.0258-7106.2017.03.004
豫西熊耳山地区吉家洼金矿床成矿物质来源探讨——碳、氧、硫、铅同位素地球化学证据
C, O, S and Pb isotopic constraints on ore-forming material sources of Jijiawa gold deposit in Xiong'er Mountain area, western Henan
摘要
Abstract
The Jijiawa gold deposit is located in the western part of the Xiong'er Mountain gold polymetallic ore concentration area,Henan Province.The formation of orebodies was controlled by the subsidiary fault which was located in the faulted structure belt.Based on systematic field study of isotopes such as C,O,S and Pb,the authors focused on the source of ore-forming materials.With the δ13 CV-PDB values ranging from-10.3‰ to -7.7‰ and the δ18Ov-sMow ranging from 14.2‰ to 17.8‰,the C-O isotopes composition reveals that C isotope originated in magmatic-dominated fluid.The δ34S values vary from-20.4‰ to-5.4‰,suggesting that S isotope originated in early Cretaceous Huashan granite.In the process of mineralization,the change of physicochemical conditions led to sulfur isotope fractionation,which is probably the reason that the δ34S presents a large negative value.The 206pb/204pb ratios are 17.042～18.149,207pb/204pb ratios are 15.333～15.575 and 208pb/ 204pb ratios are 37.675 ～38.868,suggesting that Pb has a characteristic of crust-mantle mixed source,and it is similar to Early cretaceous granites in lead isotope composition.Based on the study of C,O,S,Pb isotopes,the authors consider that the hydrothermal system was gradually transitional from a magmatic-dominated fluid to a meteoric-dominated fluid,and early Cretaceous granite contributed main metallogenic materials.Thc Jijiawa Au gold deposit genetically belongs to magmatic hydrothermal vein gold deposit.关键词
地球化学/碳、氧、硫、铅同位素/成矿物质来源/吉家洼金矿/熊耳山地区Key words
geochemistry/C-O-S-Pb isotopes/source of ore-forming material/Jijiawa Au deposit/Xiong'er Mountain area分类
天文与地球科学引用本文复制引用
张兴康,叶会寿,张维,张福斌,何旭麒,张向存..豫西熊耳山地区吉家洼金矿床成矿物质来源探讨——碳、氧、硫、铅同位素地球化学证据[J].矿床地质,2017,36(3):595-610,16.基金项目
本文得到中国地质调查局地质调查项目(编号:1212011220869)和国土资源部成矿作用与资源评价重点实验室开放研究项目(编号:ZS1314)的联合资助 （编号:1212011220869）
