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A synthesis of magmatic Ni-Cu-(PGE) sulfide deposits in the similar to 260 Ma Emeishan large igneous province, SW China and northern Vietnam
Christina Yan Wang;  Bo Wei;  Mei-Fu Zhou, Dinh Huu Minh, Liang Qi
2018
Source PublicationJournal of Asian Earth Sciences
Volume154Pages:162-186
Abstract

Magmatic Ni-Cu-(PGE) sulfide deposits in the ca. 260-Ma Emeishan large igneous province (LIP) are all hosted in relatively small, mafic-ultramafic intrusions with surface areas usually less than 1 km(2). These deposits are mainly distributed in the Danba, Panzhihua-Xichang (Panxi), Huili, Yuanmou, Midu, Furling and Jinping regions in SW China and the Ta Khoa region in northern Vietnam. They include Ni-Cu-(PGE) sulfide-dominated, Ni-Cu sulfide dominated, and PGE-dominated types. Sulfide ores of the Ni-Cu-(PGE) and Ni-Cu sulfide-dominated deposits contain more than 10 vol% sulfides and have low PGE concentrations relative to the ores that contain < 3 vol% sulfides in the PGE-dominated deposits. The parental magmas of the host mafic-ultramafic intrusions may have been derived primarily from low-Ti picritic magmas that were produced by high degrees of partial melting of a depleted mantle source. The primary low-Ti picrites of the Emeishan LIP have relatively restricted epsilon Nd(t) and gamma Os(t) isotopic compositions, however, some of the host intrusions exhibit a large range of both epsilon Nd(t) (-9.5 to + 0.8) and gamma Os(t) (+ 5.4 to +77), indicating that they experienced variable degrees of crustal contamination during emplacement. In addition, sulfides from sulfide ores of the Ban Phuc intrusion in northern Vietnam and those from sulfide veins in country rocks have delta S-34 values ranging from -6.7 to -3.4 parts per thousand, whereas sulfides from sulfide ores of the Baimazhai No.3, Yingpanjie, Jinbaoshan and Nantianwan intrusions in SW China have highly variable delta S-34 ranging from -0.2 to +21.4 parts per thousand, indicating the addition of crustal sulfur into the mantle-derived mafic magmas. Platinum-group minerals (PGM) are abundant in the Ni-Cu-(PGE) sulfide-bearing intrusions, and they span a wide range of composition. More than 130 PGM grains have been identified in the Pt-Pd-rich Jinbaoshan intrusion, whereas only one small finodite (PdBi2) grain was observed in the Ni-Cu sulfide-dominated Baimazhai No. 3 intrusion. Overall, the three types of Ni-Cu-(PGE) sulfide deposits in the Emeishan LIP can be taken as a spectrum of Ni-Cu-(PGE) sulfide mineralization, the formation of which involved similar magmatic processes in open systems of magma conduits. The magma conduits developed along the cross-linking structures created by numerous strike-slip faults and each intrusion appears to be part of a connecting trellis of conduits that formed complex pathways from the mantle to the surface. The Ni-Cu sulfide-dominated deposits are attributed to a single sulfide segregation event in staging magma chambers, whereas the PGE-dominated deposits were likely formed by a multistage-dissolution, upgrading process in the staging chambers. The Ni-Cu-(PGE) sulfide-dominated deposits may have experienced interaction between successive pulses of S-undersaturated mafic magma and early segregated sulfide melts in the staging chambers. This study is intended to provide a better understanding of the magmatic processes related to the formation of conduit-type Ni-Cu-(PGE) sulfide deposits associated with continental flood basalt magmatism.

KeywordNi-cu-(Pge) Sulfide Mineralization mantle Source crustal Contamination magma Plumbing System emeishan Large Igneous Province
Indexed BySCI
Language英语
Document Type期刊论文
Identifierhttp://ir.gyig.ac.cn/handle/42920512-1/8675
Collection矿床地球化学国家重点实验室
Affiliation1.Key Laboratory of Mineralogy and Metallogeny, Guangzhou Institute of Geochemistry, Chinese Academy of Sciences, Guangzhou 510640, China
2.Department of Earth Sciences, The University of Hong Kong, Hong Kong, China
3.Asian Mineral Resources, Ba Dinh District, Hanoi, Viet Nam
4.State Key Laboratory of Ore Deposit Geochemistry, Institute of Geochemistry, Chinese Academy of Sciences, Guiyang 550002, China
Recommended Citation
GB/T 7714
Christina Yan Wang;Bo Wei;Mei-Fu Zhou, Dinh Huu Minh, Liang Qi. A synthesis of magmatic Ni-Cu-(PGE) sulfide deposits in the similar to 260 Ma Emeishan large igneous province, SW China and northern Vietnam[J]. Journal of Asian Earth Sciences,2018,154:162-186.
APA Christina Yan Wang;Bo Wei;Mei-Fu Zhou, Dinh Huu Minh, Liang Qi.(2018).A synthesis of magmatic Ni-Cu-(PGE) sulfide deposits in the similar to 260 Ma Emeishan large igneous province, SW China and northern Vietnam.Journal of Asian Earth Sciences,154,162-186.
MLA Christina Yan Wang;Bo Wei;Mei-Fu Zhou, Dinh Huu Minh, Liang Qi."A synthesis of magmatic Ni-Cu-(PGE) sulfide deposits in the similar to 260 Ma Emeishan large igneous province, SW China and northern Vietnam".Journal of Asian Earth Sciences 154(2018):162-186.
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