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Lithological and geochemical constraints on the magma conduit systems of the Huangshan Ni-Cu sulfide deposit, NW China
Yu-Feng Deng;  Xie-Yan Song;  Pete Hollings;  Lie-Meng Chen;  Taofa Zhou;  Feng Yuan;  Wei Xie;  Dayu Zhang;  Bingbing Zhao
2017
Source PublicationMineralium Deposita
Volume52Issue:6Pages:845-862
Abstract

Magmatic Ni-Cu sulfide deposits in northern Xinjiang, China, are associated with small mafic-ultramafic complexes, with the sulfide ores generally occurring in ultramafic rocks. The Huangshan deposit (up to 65 Mt of ore at 0.49% Ni and 0.31% Cu), one of the largest magmatic Ni-Cu deposits in northern Xinjiang, is composed of a layered sequence of lower websterite, lower lherzolite, websterite, norite-gabbro, gabbro, diorite, and gabbronorite, with sulfide mineralization mainly found in the lower lherzolite, lower websterite, and websterite. Systematic variations of the major oxides and trace elements suggest that the rocks of the Huangshan deposit are fractionated from the same parental magma, with the sharp contact and discontinuous trends of major oxide contents between different lithologies implying intrusion of four distinct stages of magma from a single deep-seated staging chamber. The reversals in olivine Fo contents and major oxides in the lower lherzolite were the result of inhomogeneity in olivine within the lower chamber. The Se/S ratios (63.1 similar to 150 x 10(-6)) and the negative correlation between Se/S and delta S-34 (0.63 similar to 2.42 parts per thousand) of the sulfide ores suggest that a large contribution of crustal S caused the sulfide segregation. The sulfides in the lower lherzolite have lower Cu contents (1386-2200 ppm) and Cu/Pd ratios (2.31 x 10(5)-1.36 x 10(6)) relative to those in the mineralized lower websterite (Cu = 2300 to 18,700 ppm, and Cu/Pd = 6.65 x 10(5) to 2.73 x 10(6)). A positive correlation between Pd/Ir and Ni/Ir for the vein-textured sulfides in the lower websterite likely reflects fractionated sulfides picked up by a new pulse of magma. In contrast, the restricted range of Pd/Ir ratios indicates that the PGE contents of the disseminated sulfides in the lower lherzolite resulted from reaction between the sulfides and new pulses of S-undersaturated magma.

Keywords Magmatic Ni-cu Sulfide Deposit Central Asian Orogenic Belt Huangshan Mafic-ultramafic Intrusion Magma Conduit System Sulfide Saturation
Indexed BySCI
Language英语
Document Type期刊论文
Identifierhttp://ir.gyig.ac.cn/handle/42920512-1/8079
Collection矿床地球化学国家重点实验室
Affiliation1.School of Resources and Environmental Engineering, Hefei University of Technology, Hefei 230009, China
2.Ore Deposit and Exploration Centre, Hefei University of Technology, Hefei 230009, China
3.State Key Laboratory of Ore Deposit Geochemistry, Institute of Geochemistry, Chinese Academy of Sciences, 46th Guanshui Road, Guiyang 550002, People’s Republic of China
4.Department of Geology, Lakehead University, 955 Oliver Road, Thunder Bay, ON P7B 5E1, Canada
5.Xinjiang Research Centre for Mineral Resources, Xinjiang Institute of Ecology and Geography, Chinese Academy of Sciences, Urumqi, Xinjiang 830011, China
6.State Key Laboratory of Isotope Geochemistry, Guangzhou Institute of Geochemistry, Chinese Academy of Sciences, Guangzhou 510640, China
Recommended Citation
GB/T 7714
Yu-Feng Deng;Xie-Yan Song;Pete Hollings;Lie-Meng Chen;Taofa Zhou;Feng Yuan;Wei Xie;Dayu Zhang;Bingbing Zhao. Lithological and geochemical constraints on the magma conduit systems of the Huangshan Ni-Cu sulfide deposit, NW China[J]. Mineralium Deposita,2017,52(6):845-862.
APA Yu-Feng Deng;Xie-Yan Song;Pete Hollings;Lie-Meng Chen;Taofa Zhou;Feng Yuan;Wei Xie;Dayu Zhang;Bingbing Zhao.(2017).Lithological and geochemical constraints on the magma conduit systems of the Huangshan Ni-Cu sulfide deposit, NW China.Mineralium Deposita,52(6),845-862.
MLA Yu-Feng Deng;Xie-Yan Song;Pete Hollings;Lie-Meng Chen;Taofa Zhou;Feng Yuan;Wei Xie;Dayu Zhang;Bingbing Zhao."Lithological and geochemical constraints on the magma conduit systems of the Huangshan Ni-Cu sulfide deposit, NW China".Mineralium Deposita 52.6(2017):845-862.
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