| 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 | |
Xiao-Qi Zhang; Xie-Yan Song ; Lie-Meng Chen; Song-Yue Yu; Wei Xie; Yufeng Deng; Jia-Fei Zhang; Shu-Guang Gui
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| 2013 | |
| Source Publication | Contributions to Mineralogy and Petrology
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| Volume | 166Issue:1Pages:193-209 |
| Abstract | 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 x 10(6)-6.1 x 10(4)) and low Pd/Zr (< 0.1) indicate that the Baima parental magma experienced prior sulfide segregation. Mantle-liked delta S-34 values and low S/Se values indicate negligible external sulfur addition. Primitive mantle-normalized PGE patterns and MELTS calculations indicate that extensive fractional crystallization (similar to 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. |
| Keyword | Emeishan Large Igneous Province Panxi Area Layered Intrusion High-ti Basalts Chalcophile Elements Sulfide Saturation |
| Subject Area | 矿床地球化学 |
| Indexed By | SCI |
| Language | 英语 |
| Document Type | 期刊论文 |
| Identifier | http://ir.gyig.ac.cn/handle/352002/5060 |
| Collection | 矿床地球化学国家重点实验室_矿床地球化学国家重点实验室_期刊论文 矿床地球化学国家重点实验室 |
| Recommended Citation GB/T 7714 | Xiao-Qi Zhang,Xie-Yan Song,Lie-Meng Chen,et al. 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[J]. Contributions to Mineralogy and Petrology,2013,166(1):193-209. |
| APA | Xiao-Qi Zhang.,Xie-Yan Song.,Lie-Meng Chen.,Song-Yue Yu.,Wei Xie.,...&Shu-Guang Gui.(2013).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.Contributions to Mineralogy and Petrology,166(1),193-209. |
| MLA | Xiao-Qi Zhang,et al."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".Contributions to Mineralogy and Petrology 166.1(2013):193-209. |
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