Chalcophile element geochemistry of the Baima layered intrusion, Emeishan Large Igneous Province, SW China: implications for sulfur saturation history and genetic relationship with high-Ti basalts
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- 作者：Xiao-Qi Zhang (1) (2)
Xie-Yan Song (1)
Lie-Meng Chen (1)
Song-Yue Yu (1)
Wei Xie (1)
Yufeng Deng (1)
Jia-Fei Zhang (3)
Shu-Guang Gui (3) - 关键词：Emeishan large igneous province ; Panxi area ; Layered intrusion ; High ; Ti basalts ; Chalcophile elements ; Sulfide saturation
- 刊名：Contributions to Mineralogy and Petrology
- 出版年：2013
- 出版时间：July 2013
- 年：2013
- 卷：166
- 期：1
- 页码：193-209
- 全文大小：1385KB
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Xie-Yan Song (1)
Lie-Meng Chen (1)
Song-Yue Yu (1)
Wei Xie (1)
Yufeng Deng (1)
Jia-Fei Zhang (3)
Shu-Guang Gui (3)
1. State Key Laboratory of Ore Deposit Geochemistry, Institute of Geochemistry, Chinese Academy of Sciences, 46th Guanshui Road, Guiyang, 550002, China
2. Graduate University of the Chinese Academy of Sciences, Beijing, 100049, China
3. Panzhihua Group Company Ltd., Panzhihua, Sichuan, China - ISSN：1432-0967
文摘
The Permian Baima mafic layered intrusion, believed to be related to the S-undersaturated Emeishan high-Ti basalts, hosts a giant Fe–Ti-V oxide deposit in the lower part of the intrusion. Uniformly high Cu/Pd (1.9?×?106-.1?×?104) and low Pd/Zr (<0.1) indicate that the Baima parental magma experienced prior sulfide segregation. Mantle-liked δ34S values and low S/Se values indicate negligible external sulfur addition. Primitive mantle-normalized PGE patterns and MELTS calculations indicate that extensive fractional crystallization (~59?%) of chromite, olivine and pyroxene at depth drove the primitive picritic magma to S saturation. Strong positive correlation between IPGE and PPGE and between PGE and V, Cr and S suggest that magmatic sulfide is the dominant mineral controlling the distribution of PGE in the Baima intrusion. A positive correlation between S and Cr, FeOT?+?TiO2 and V content, together with MELTS calculations, indicate that the parental magma of the Baima intrusion reached a second stage of S saturation in the shallower Baima magma chamber, which was likely triggered by decreasing Fe2+ accompanying magnetite precipitation. Primitive mantle-normalized PGE patterns for Baima intrusion rocks display similar trends to high-Ti basalts inside the Panxi area, suggesting that they are comagmatic, and following a similar differentiation trend. However, the lavas erupted before they reached sulfide saturation. The more evolved nature of high-Ti basalts outside the Panxi area indicate that they experienced more extensive pre-eruption fractional crystallization. Further fractional crystallization process led these lavas show more PGE fractionated feature.