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Magma Plumbing System of Emeishan Large Igneous Province at the End-Permian: Insights from Clinopyroxene Compositional Zoning and Thermobarometry

by 1,*,†, 2,3,*,†, 1 and 4
1
College of Urban and Rural Planning and Architectural Engineering, Guiyang University, Guiyang 550005, China
2
Center for Lunar and Planetary Sciences, Institute of Geochemistry, Chinese Academy of Sciences, Guiyang 550081, China
3
College of Earth and Planetary Sciences, University of Chinese Academy of Sciences, Beijing 100049, China
4
College of Earth Sciences, Jilin University, Changchun 130061, China
*
Authors to whom correspondence should be addressed.
These authors contributed equally.
Minerals 2020, 10(11), 979; https://doi.org/10.3390/min10110979
Received: 1 August 2020 / Revised: 21 October 2020 / Accepted: 28 October 2020 / Published: 2 November 2020
(This article belongs to the Section Mineral Deposits)
The end-Permian Emeishan Large Igneous Province (ELIP) in SW China is widely accepted to have formed by mantle plume activities, forming voluminous flood basalts and rare picrites. Although many studies were performed on the petrogenesis and tectonic setting, the detailed conditions and processes within the magma chamber(s) remain unsolved. In this study, we studied the sector-/oscillatory-zoned clinopyroxene (Cpx) phenocrysts and performed Cpx-liquid thermobarometric calculation to constrain the physicochemical processes within the magma chambers. The results show that Cpx phenocrysts from the high-Mg basalts were crystallized at 4–27 (average 17) km, whilst those from the low-Mg basalt were crystallized at 0–23 (average 9) km depth. The sector and oscillatory Cpx zoning in the high-Mg basalts show that the magma had experienced undercooling and multistage recharge events in the deep-staging chamber(s). The magma replenishments may have eventually led to the eruption of high-Mg basalts, and magma ascent to the upper crust for further fractionation to form the low-Mg basalts and mafic intrusions. View Full-Text
Keywords: mineral zoning; clinopyroxene phenocryst; emeishan large igneous province (ELIP); magma plumbing system mineral zoning; clinopyroxene phenocryst; emeishan large igneous province (ELIP); magma plumbing system
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MDPI and ACS Style

Hu, J.-H.; Liu, J.-W.; Song, T.; Shi, B.-S. Magma Plumbing System of Emeishan Large Igneous Province at the End-Permian: Insights from Clinopyroxene Compositional Zoning and Thermobarometry. Minerals 2020, 10, 979. https://doi.org/10.3390/min10110979

AMA Style

Hu J-H, Liu J-W, Song T, Shi B-S. Magma Plumbing System of Emeishan Large Igneous Province at the End-Permian: Insights from Clinopyroxene Compositional Zoning and Thermobarometry. Minerals. 2020; 10(11):979. https://doi.org/10.3390/min10110979

Chicago/Turabian Style

Hu, Jun-Hao, Jing-Wen Liu, Tao Song, and Bai-Shun Shi. 2020. "Magma Plumbing System of Emeishan Large Igneous Province at the End-Permian: Insights from Clinopyroxene Compositional Zoning and Thermobarometry" Minerals 10, no. 11: 979. https://doi.org/10.3390/min10110979

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