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Permian flood basalts and mafic intrusions in the Jinping (SW China)–Song Da (northern Vietnam) district: Mantle sources, crustal contamination and sulfide segregation
Christina YanWang;  Mei-FuZhou;  Liang Qi
2007
Source PublicationChemical Geology
Volume243Issue:3–4Pages:317-343
Abstract

The ∼ 260-Ma Emeishan large igneous province (ELIP) in SW China and northern Vietnam includes high-Ti and low-Ti volcanic rocks and coeval mafic–ultramafic plutons. In the Jinping (SW China)–Song Da (northern Vietnam) district, the southernmost part of the ELIP, basalts and gabbros of the high-Ti series displays a narrow range of εNd(t) values (+ 0.5 to + 1.1) and low primitive mantle-normalized Th/Nb ratios (∼ 1.4), similar to those of an OIB-like enriched mantle source. The rocks have chondrite-normalized REE patterns enriched in LREE and depleted in HREE. This feature, together with low Al2O3/TiO2 ratios (∼ 4), indicates that the primary melts were generated by small degrees of partial melting at garnet stable depths. The low-Ti series includes LREE-depleted and LREE-enriched picrites, basalts, olivine gabbros and gabbros. The LREE-depleted picrites have chondrite-normalized Ce/Yb ratios of 0.4–0.5, very positive εNd(t) values (+ 7.0), and very negative Th anomalies in primitive mantle-normalized trace element patterns. They were formed by high degrees of partial melting of a strongly depleted mantle source at relatively shallow mantle depths. The LREE-enriched picrites have very negative εNd(t) values (− 7.8) that indicate a mantle source locally modified by subducted oceanic crust. Highly variable chemical compositions and εNd(t) values (+ 6.4 to − 10.2) of the low-Ti basalts and gabbros are attributed to variable degrees of upper crustal contamination of the picritic parental magmas. Therefore, the extrusive and intrusive rocks in this region clearly formed from heterogeneous mantle sources. Crustal contamination triggered S-saturation of some low-Ti magmas and resulted in segregation of immiscible sulfide melts and generation of magmatic Ni–Cu–(PGE) sulfide deposits in this region. Eruption of magmas after sulfide segregation formed PGE-depleted low-Ti basalts.

KeywordFlood Basalts mafic Intrusions geochemistry sw China northern Vietnam emeishan Large Igneous Province
Indexed BySCI
Language英语
Document Type期刊论文
Identifierhttp://ir.gyig.ac.cn/handle/42920512-1/8119
Collection矿床地球化学国家重点实验室
Affiliation1.Department of Earth Sciences, The University of Hong Kong, Hong Kong, China
2.State Key Laboratory of Ore Deposit Geochemistry, Institute of Geochemistry, Chinese Academy of Sciences, Guiyang 550081, China
Recommended Citation
GB/T 7714
Christina YanWang;Mei-FuZhou;Liang Qi. Permian flood basalts and mafic intrusions in the Jinping (SW China)–Song Da (northern Vietnam) district: Mantle sources, crustal contamination and sulfide segregation[J]. Chemical Geology,2007,243(3–4):317-343.
APA Christina YanWang;Mei-FuZhou;Liang Qi.(2007).Permian flood basalts and mafic intrusions in the Jinping (SW China)–Song Da (northern Vietnam) district: Mantle sources, crustal contamination and sulfide segregation.Chemical Geology,243(3–4),317-343.
MLA Christina YanWang;Mei-FuZhou;Liang Qi."Permian flood basalts and mafic intrusions in the Jinping (SW China)–Song Da (northern Vietnam) district: Mantle sources, crustal contamination and sulfide segregation".Chemical Geology 243.3–4(2007):317-343.
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