Geochronological and geochemical study of the Baixintan magmatic Ni-Cu sulphide deposit: New implications for the exploration potential in the western part of the East Tianshan nickel belt (NW China)
Feng, Yanqing1; Qian, Zhuangzhi1,2; Duan, Jun1; Xu, Gang1,2; Ren, Meng3; Jiang, Chao4
2018-04-01
发表期刊ORE GEOLOGY REVIEWS
卷号95期号:2页码:366-381
文章类型Article
摘要Several newly discovered magmatic Ni-Cu sulphide deposits are located in the East Tianshan nickel belt in the southern part of the Central Asian Orogenic Belt in NW China. The Baixintan magmatic sulphide deposit is one of these new discoveries. The host mafic-ultramafic intrusion of the Baixintan deposit is composed of plagioclasebearing lherzolite, Pl-bearing olivine websterite, olivine norite and gabbro. Zircon crystals from olivine norite yielded a U-Pb age of 286.0 +/- 1.6 Ma, similar to the ages of other magmatic Ni-Cu sulphide ore deposits in this belt. Disseminated sulphide mineralization is present in olivine-bearing rocks. The Fo and Ni contents of olivine crystals from the sulphide-barren samples vary from 81.7 to 85.6 mol% and from 956 to 2837 ppm, respectively, exhibiting a positive Fo-Ni correlation that is consistent with the fractional crystallization of olivine plus removal of small amounts of immiscible sulphide liquid. The Baixintan mafic-ultramafic rocks are characterized by light REE enrichment, pronounced negative Nb-Ta anomalies, low initial Sr-87/Sr-86 ratios from 0.7035 to 0.7039, positive epsilon Nd((CHUR, 286 Ma) )values from 6.0 to 7.4 and zircon epsilon Hf-(CHUR,Hf- 286 Ma) values from +11.6 to +15.8. These data indicate that the parental magmas were derived from a depleted mantle source with moderate degrees of contamination by the upper crust. The variations in PGE tenor in the Baixintan deposit, which are characterized by positive correlations between IPGE and PPGE, can be explained by variable R factors (R = 400-3000). Mass balance calculations indicate that the parental magma was severely depleted in PGE, which could be likely due to prior sulphide segregation at depth or sulphide retention in the mantle during partial melting. Both fractional crystallization and crustal contamination may have played a role in triggering second stage sulphide saturation in the Baixintan magma. The similarities in ages, lithological controls and bulk sulphide composition between the Baixintan deposit and other known magmatic Ni-Cu sulphide ore deposits in the East Tianshan nickel belt encourage further exploration in the Baixintan mafic-ultramafic intrusion, as well as expansion of the on-going regional Ni exploration program.
关键词Zircon U-pb Dating Chalcophile Elements Hf-sr-nd Isotopes Baixintan Ni-cu Sulphide Deposit East Tianshan Nickel Belt
WOS标题词Science & Technology ; Physical Sciences
DOI10.1016/j.oregeorev.2018.02.023
关键词[WOS]ASIAN OROGENIC BELT ; MAFIC-ULTRAMAFIC INTRUSIONS ; PLATINUM-GROUP ELEMENTS ; U-PB GEOCHRONOLOGY ; SLAB BREAK-OFF ; ISOTOPIC COMPOSITION ; TRACE-ELEMENT ; FLOOD BASALTS ; ORE GENESIS ; HF ISOTOPES
收录类别SCI
语种英语
WOS研究方向Geology ; Mineralogy ; Mining & Mineral Processing
WOS类目Geology ; Mineralogy ; Mining & Mineral Processing
WOS记录号WOS:000432760500021
引用统计
文献类型期刊论文
条目标识符http://ir.ieecas.cn/handle/361006/5121
专题黄土与第四纪地质国家重点实验室(2010~)
作者单位1.Changan Univ, Coll Earth Sci & Resources, Xian 710054, Shaanxi, Peoples R China
2.MLR Key Lab Genesis & Explorat Magmat Ore Deposit, Xian 710054, Shaanxi, Peoples R China
3.Chinese Acad Sci, Inst Earth Environm, Xian 710075, Shaanxi, Peoples R China
4.Shaanxi Nucl Ind Geol Surveying Inst, Xian 710100, Shaanxi, Peoples R China
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Feng, Yanqing,Qian, Zhuangzhi,Duan, Jun,et al. Geochronological and geochemical study of the Baixintan magmatic Ni-Cu sulphide deposit: New implications for the exploration potential in the western part of the East Tianshan nickel belt (NW China)[J]. ORE GEOLOGY REVIEWS,2018,95(2):366-381.
APA Feng, Yanqing,Qian, Zhuangzhi,Duan, Jun,Xu, Gang,Ren, Meng,&Jiang, Chao.(2018).Geochronological and geochemical study of the Baixintan magmatic Ni-Cu sulphide deposit: New implications for the exploration potential in the western part of the East Tianshan nickel belt (NW China).ORE GEOLOGY REVIEWS,95(2),366-381.
MLA Feng, Yanqing,et al."Geochronological and geochemical study of the Baixintan magmatic Ni-Cu sulphide deposit: New implications for the exploration potential in the western part of the East Tianshan nickel belt (NW China)".ORE GEOLOGY REVIEWS 95.2(2018):366-381.
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