| Fractional crystallization and the formation of thick Fe-Ti-V oxide layers in the Baima layered intrusion, SW China | |
Xiao-Qi Zhang; Xie-Yan Song ; Lie-Meng Chen; Wei Xie; Song-Yue Yu; Wen-Qin Zheng; Yu-Feng Deng; Jia-Fei Zhang; Shu-Guang Gui
| |
| 2012 | |
| Source Publication | Ore Geology Reviews
 |
| Volume | 49Issue:1Pages:96-108 |
| Abstract | The Baima layered intrusion is located in the central part of the Emeishan Large Igneous Province (ELIP). The N-S striking intrusion is similar to 24 km long and similar to 2 km thick and dips to the west. Based on variations in modal proportions and cumulus mineral assemblages, the intrusion from the base to the top is simply subdivided into a lower zone (12) with most of the economic magnetite layers, and an upper zone (UZ) with apatite-bearing troctolite and gabbro. The rock textures suggest crystallization of the Fe-Ti oxide slightly later than plagioclase (An(67-54)) but relatively earlier than olivine (Fo(74-55)), followed by clinopyroxene and finally apatite. Relatively low olivine forsterite content and abundant ilmenite exsolution lamellae in clinopyroxene indicate that the Baima parental magma is a highly evolved Fe-Ti-rich magma. Via MELTS model, it demonstrates that under a closed oxygen system, extensive silicate mineral fractionation of a picritic magma might lead to Fe and Ti enrichment and oxygen fugacity elevation in the residual magma. When such Fe-Ti-rich magma ascends to the shallower Baima intrusion, the Fe-Ti oxides may become an early liquidus phase. Well-matched olivine and plagioclase microprobe data with the results of MELTS calculation, combined with relatively low CaO content in olivine (0.02-0.08 wt.%) indicate that wall-rock contamination probably plays a weak role on oxygen fugacity elevation and the early crystallization of Fe-Ti oxides. Several reversals in whole-rock chromium and plagioclase anorthite contents illustrate that multiple recharges of such Fe-Ti-rich magma mainly occurred along the lower part of the Baima magma chamber. Frequent Fe-Ti-rich magma replenishment and gravitational sorting and settling are crucial for the development of thick Fe-Ti oxide layers at the base of the Baima layered intrusion. |
| Keyword | Emeishan Large Igneous Province Baima Layered Intrusion Fe–ti Oxide Closed To Oxygen System Magma Replenishment Melts |
| Indexed By | SCI |
| Language | 英语 |
| Document Type | 期刊论文 |
| Identifier | http://ir.gyig.ac.cn/handle/352002/5133 |
| 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. Fractional crystallization and the formation of thick Fe-Ti-V oxide layers in the Baima layered intrusion, SW China[J]. Ore Geology Reviews,2012,49(1):96-108. |
| APA | Xiao-Qi Zhang.,Xie-Yan Song.,Lie-Meng Chen.,Wei Xie.,Song-Yue Yu.,...&Shu-Guang Gui.(2012).Fractional crystallization and the formation of thick Fe-Ti-V oxide layers in the Baima layered intrusion, SW China.Ore Geology Reviews,49(1),96-108. |
| MLA | Xiao-Qi Zhang,et al."Fractional crystallization and the formation of thick Fe-Ti-V oxide layers in the Baima layered intrusion, SW China".Ore Geology Reviews 49.1(2012):96-108. |
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