摘要
由黄山铜镍矿床浸染状矿化橄榄岩中Ni的赋存状态分析得到其硅酸镍含量为4%~20%,且硅酸镍含量和全岩Ni含量呈负相关,主要受橄榄石比例和橄榄石Ni含量控制。当全岩Ni大于0.4%时,黄山矿床浸染状矿化橄榄岩中硅酸镍比例常小于10%。450中段坑内钻KZK1475中硫化物从矿体下盘至上盘呈逐渐减少趋势,结合黄山岩体从浅部至深部基性程度逐渐增高的岩相分带特征,认为岩浆结晶过程中主要受重力分异控制。矿体中硫化物呈多段富集,可能与新鲜岩浆注入有关。本文还对东疆地区其他超基性岩相赋矿的矿床（黄山南矿床和坡北地区铜镍矿床）进行了硅酸镍含量模拟,得到两个矿床浸染状矿化橄榄岩中硅酸镍比例多为10%~20%,大部分大于20%,而矿化纯橄岩中硅酸镍比例都大于20%。因此,东疆地区在橄榄岩赋矿的铜镍矿床（矿点）勘探和开采过程中,应考虑矿体中硅酸镍的含量。
Silicate Ni content analysis results reveal that silicate Ni contents of the Huangshan deposit vary from 4% to 20% and it is negative correlated with Ni content in whole rock.Both modelling and analysis results suggest that the pro- portion of silicate nickel are less than 10% when Ni in whole rock are more than 0.4% in the Huangshan deposit. The sul- fide amount in drilling core KZK1475 decreases from the lower zone to the upper zone. This, together with the lithologi- cal distribution, indicates that gravitational diffusion played a key role during magma fractional crystallization. The dis- order of the sulfide in the ore-bodies can be explained by fresh magma injection. In addition, this study also model the silicate Ni content in the Huangshannan and Pobei deposits regionally, whose sulfide are hosted by olivine rich rocks. It is indicated that disseminated lherzolite in these deposits mainly consist 10% to 20% silicate Ni and disseminated dunite in the Pobei deposits have silicate Ni more than 20%. Consequently, we proposed that the silicate Ni content should be taken into account during exploration if the host rocks are both rich in olivine and olivine in them are rich in Ni in the Eastern Xinjiang.
出处
《新疆地质》
CAS
CSCD
2016年第3期367-374,共8页
Xinjiang Geology
基金
国家自然科学基金(41502095)
黄山铜镍矿30号矿体NiSiO4含量分析研究项目(YKSDCBQC-02)
中国博士后科学基金资助项目(2015M570146)联合资助
关键词
东天山
黄山铜镍矿床
基性-超基性岩
硅酸镍
硫化物聚集过程
Eastem Tianshan
Huangshan Ni-Cu deposit
Mafic-ultramafic rocks
Nickel silicate/Ni in silicate minerals
Sulfide enrichment process
