西北地质2017，Vol.50Issue(1)：13-24,12.
新疆坡北铜镍矿床铂族元素特征及其对成矿过程的约束
Geochemical Characters of Platinum-group Elements and Its Significances on the Mineralization Process of the Pobei Cu-Ni Sulfide Depositin Xinjiang
摘要
Abstract
The Pobei Cu-Ni deposit is located in the northeastern margin of Tarimcraton.The main ore types of this deposit contain speckled ore and sparse disseminated ore, which show gradual transition relationship.Sulfide ores show low ∑PGE content, which range from 2.47×10-9 to 404.17×10-9.The S has poor correlation with Ni, but has good positive correlation with Ir, Ru, Rh, Pt and Pd except few samples,which suggest that PGE were mainly occurred in the sufides.The Irshows significant positive correlation with Ru and Rh,but poor relationship with Pd.The Pd shows good positive correlation with Ru, Rh and Pt, which indicate that no obviousfractional crystallization of monosulfide solid solution(MSS) was occurred after the sulfide liquation.After normalizing to 100% sulfide, the average content of ∑PGE is 2 806.9×10-9, the primitive mantle standardization diagram show left-oblique type of rich Pd and Pt, which are obviously depleted in PGE when compared with Ni and Cu.The simulated calculation shows that the "R"factors of the Pobei deposit are mainly range from 50 to 500, the content of Ru and Pd in parent magma are 0.36×10-9 and 3.6×10-9, respectively.A small amount of sulfide residual in the magma source is the main cause for the deficit of PGE.The silicate magma contained sulfide would consolidated into the rock and ore at stability dynamic environment, which were unfavourable for the effective accumulation sulfide, resulting the metal grade is low.关键词
坡北铜镍矿床/铂族元素/部分熔融/硫化物熔离/新疆北山Key words
Pobei Cu-Ni sulfide deposit/Platinum-group elements/partial melting/sulfideliquation/Xinjiang Beishan area分类
天文与地球科学引用本文复制引用
王亚磊,张照伟,张江伟,高永宝,钱兵,李侃..新疆坡北铜镍矿床铂族元素特征及其对成矿过程的约束[J].西北地质,2017,50(1):13-24,12.基金项目
国土资源部公益性行业科研专项"拉陵灶火镍成矿赋矿机理及勘查技术示范研究"(201511020)和国家青年自然科学基金项目"金川铜镍矿床熔体包裹体研究:硫化物熔离机制探讨"(41302052) （201511020）
