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Controls on trace-element partitioning among co-crystallizing minerals: Evidence from the Panzhihua layered intrusion, SW China
Lie-Meng Chen;   Xie-Yan Song;   Rui-Zhong Hu;   Song-Yue Yu;   Hai-Long He;   Zhi-Hui Dai;   Yu-Wei She;   Wei Xie
2017
Source PublicationAmerican Mineralogist
Volume102Issue:5Pages:1006-1020
Abstract

The factors and processes that control trace-element partitioning among co-crystallizing cumulus minerals in layered intrusions have long been controversial. Here we address this issue using new laser ablation ICP-MS trace element data for magnetite, ilmenite, and clinopyroxene from the Panzhihua layered intrusion in the Emeishan large igneous province, SW China. The cumulus minerals display strong Ni, Co, and Cr depletions, indicative of parental magmas low in concentration of these elements probably due to prior sulfide removal and the fractionation of chromite or Cr-magnetite in a staging magma chamber at depth. Both magnetite and clinopyroxene show cyclical variations in some transition elements (e.g., Cr, V, and Ni) along the stratigraphic section. The average concentrations of these transition elements in magnetite are positively correlated with those in clinopyroxene, likely resulting from co-crystallization of magnetite and clinopyroxene. The incompatible element (e.g., Zr, Hf, and Nb) concentrations of the cumulus minerals from the Lower Zone are highly variable compared to those of the Middle and Upper Zones. These large variations in trace element compositions are attributed to a “trapped liquid shift” in the Lower Zone. Ilmenite crystals from the Panzhihua intrusion may have undergone extensive modification of transition elements during subsolidus re-equilibration with magnetite, leading to the decoupled variations of transition elements in ilmenite across the Lower Zone stratigraphy. Our study indicates that systematic trace element variations of the main cumulus mineral assemblage, rather than a single mineral, need to be considered to better constrain the magmatic differentiation and elemental fractionation of layered intrusions.

KeywordMineral Trace Element Geochemistry Fe-ti Oxides Co-crystallization Panzhihua Layered Intrusion Emeishan Large Igneous Province
Language英语
Document Type期刊论文
Identifierhttp://ir.gyig.ac.cn/handle/42920512-1/8336
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, Guiyang, 550081, P.R. China
2.University of Chinese Academy of Sciences, Beijing, 100049, P.R. China
3.State Key Laboratory of Isotope Geochemistry, Guangzhou Institute of Geochemistry, Chinese Academy of Sciences,Guangzhou, 510640, P.R. China
Recommended Citation
GB/T 7714
Lie-Meng Chen; Xie-Yan Song; Rui-Zhong Hu; Song-Yue Yu; Hai-Long He; Zhi-Hui Dai; Yu-Wei She; Wei Xie. Controls on trace-element partitioning among co-crystallizing minerals: Evidence from the Panzhihua layered intrusion, SW China[J]. American Mineralogist,2017,102(5):1006-1020.
APA Lie-Meng Chen; Xie-Yan Song; Rui-Zhong Hu; Song-Yue Yu; Hai-Long He; Zhi-Hui Dai; Yu-Wei She; Wei Xie.(2017).Controls on trace-element partitioning among co-crystallizing minerals: Evidence from the Panzhihua layered intrusion, SW China.American Mineralogist,102(5),1006-1020.
MLA Lie-Meng Chen; Xie-Yan Song; Rui-Zhong Hu; Song-Yue Yu; Hai-Long He; Zhi-Hui Dai; Yu-Wei She; Wei Xie."Controls on trace-element partitioning among co-crystallizing minerals: Evidence from the Panzhihua layered intrusion, SW China".American Mineralogist 102.5(2017):1006-1020.
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