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Geochemistry of the Emeishan flood basalts at Yangliuping, Sichuan, SW China: implications for sulfide segregation
Xie-Yan Song;  Mei-Fu Zhou;  Reid R. Keays;  Zhi-Min Cao;  Min Sun;  Liang Qi
2006
Source PublicationContributions to Mineralogy & Petrology
Volume152Issue:1Pages:53-74
Abstract

 

A well-developed, 1,00002m thick basaltic sequence in the Yangliuping region, northern part of the Emeishan basalt province, includes the Lower and Middle Units of tholeiitic basalts and an Upper Unit of both tholeiites and subalkalic basalts. The basalts contain 42–5502wt% SiO 2 and 4.1–8.302wt% MgO. Most of these lavas have Gd/Yb > 2.0, Zr/Nb < 12, and 07 Nd(26002Ma) values from +2.5 to +4.7. The platinum-group elements (PGE) are very mildly depleted in most of the basalts which contain 8–1902ppb Pt and 7–2702ppb Pd. However, a significant proportion of the Middle Unit basalts are strongly depleted in PGE with some samples having concentrations lower than detection limits. They have extremely high Zr/Nb ratios (up to 14.5) and low 07 Nd(26002Ma) values (+3.21 to +0.65), features of extensive lower crustal contamination. Some samples in this unit have high Ni/Pd (3,965–61,198) and low Pd/Cr (410,000–3,930,000) ratios, indicating sulfide segregation and PGE depletion prior to eruption. The primary magmas were S-undersaturated and derived from partial melting at variable depths in the upper mantle. The early and late stage magmas, as represented by the Lower and Upper Units, underwent AFC processes which induced mild S-saturation and PGE depletion in some of the basalts, whereas the magmas represented by the Middle Unit experienced more extensive crustal contamination resulting in stronger S-saturation and in most cases significant PGE depletion.

KeywordInductively Couple Plasma Mass Spectrometry Crustal Contamination Siberian Trap Magmatic Sulfide Middle Unit
Indexed BySCI
Language英语
Document Type期刊论文
Identifierhttp://ir.gyig.ac.cn/handle/42920512-1/8124
Collection矿床地球化学国家重点实验室
Affiliation1.State Key Laboratory of Ore Deposit Geochemistry, Institute of Geochemistry, Chinese Academy of Sciences, 64th Guanshui Road, Guiyang 550002, People’s Republic of China
2.Department of Earth Sciences, The University of Hong Kong, Hong Kong, People’s Republic of China
3.School of Geosciences, Monash University, PO Box 28E, Monash, VIC 3800, Australia
4.College of Earth Sciences, Ocean University of China, Qingdao 266003, People’s Republic of China
Recommended Citation
GB/T 7714
Xie-Yan Song;Mei-Fu Zhou;Reid R. Keays;Zhi-Min Cao;Min Sun;Liang Qi. Geochemistry of the Emeishan flood basalts at Yangliuping, Sichuan, SW China: implications for sulfide segregation[J]. Contributions to Mineralogy & Petrology,2006,152(1):53-74.
APA Xie-Yan Song;Mei-Fu Zhou;Reid R. Keays;Zhi-Min Cao;Min Sun;Liang Qi.(2006).Geochemistry of the Emeishan flood basalts at Yangliuping, Sichuan, SW China: implications for sulfide segregation.Contributions to Mineralogy & Petrology,152(1),53-74.
MLA Xie-Yan Song;Mei-Fu Zhou;Reid R. Keays;Zhi-Min Cao;Min Sun;Liang Qi."Geochemistry of the Emeishan flood basalts at Yangliuping, Sichuan, SW China: implications for sulfide segregation".Contributions to Mineralogy & Petrology 152.1(2006):53-74.
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