Geochemical Insights from Clinopyroxene Phenocrysts into the Magma Evolution of an Alkaline Magmatic System from the Sanshui Basin, South China

The Sanshui Basin is located at the northern continental margin of the South China Sea and characterized by a continental rift basin. The bimodal volcanic rocks in Sanshui Basin record the early Cenozoic magmatic activity in the South China Block, but the magmatic evolution that produced the bimodal...

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Autores principales:	Peijia Chen, Nianqiao Fang, Xiaobo Yuan
Formato:	article
Lenguaje:	EN
Publicado:	MDPI AG 2021
Materias:	Sanshui Basin clinopyroxene phenocryst thermobarometry magma mixing fractional crystallization Mineralogy QE351-399.2
Acceso en línea:	https://doaj.org/article/ded42cc98c7b4c15ae17bbb80e5401b3
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id	oai:doaj.org-article:ded42cc98c7b4c15ae17bbb80e5401b3
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spelling	oai:doaj.org-article:ded42cc98c7b4c15ae17bbb80e5401b32021-11-25T18:26:56ZGeochemical Insights from Clinopyroxene Phenocrysts into the Magma Evolution of an Alkaline Magmatic System from the Sanshui Basin, South China10.3390/min111112952075-163Xhttps://doaj.org/article/ded42cc98c7b4c15ae17bbb80e5401b32021-11-01T00:00:00Zhttps://www.mdpi.com/2075-163X/11/11/1295https://doaj.org/toc/2075-163XThe Sanshui Basin is located at the northern continental margin of the South China Sea and characterized by a continental rift basin. The bimodal volcanic rocks in Sanshui Basin record the early Cenozoic magmatic activity in the South China Block, but the magmatic evolution that produced the bimodal volcanic rocks is poorly understood. Clinopyroxenes in bimodal volcanic rocks in the Sanshui Basin provide an opportunity to investigate magma during magma ascent. In this work, we classified nine types of clinopyroxene phenocrysts according to composition and texture in cogenetic basalt-trachyandesite-comenditic trachyte, while the composition of unzoned clinopyroxene have an evolution sequence of diopside-hedenbergite-aegirine along with an increase in trace element contents with a decrease of Mg<sup>#</sup>, indicating that the genesis of clinopyroxene was dominated by fractional crystallization in a closed magma system. However, the clinopyroxenes with reversed zoning and multiple zoning record the process of magma mixing and recharge indicating an open magma system. While fractional crystallization is the dominant process, magma mixing, recharge, and crystal settling were also found to influence magma evolution. Thermobarometric calculations showed that clinopyroxene crystallized a several structural levels in the crust during magma ascent. In this study, we established a magma plumbing system that provides new constraints for the magma evolution in the Sanshui Basin.Peijia ChenNianqiao FangXiaobo YuanMDPI AGarticleSanshui Basinclinopyroxene phenocrystthermobarometrymagma mixingfractional crystallizationMineralogyQE351-399.2ENMinerals, Vol 11, Iss 1295, p 1295 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	Sanshui Basin clinopyroxene phenocryst thermobarometry magma mixing fractional crystallization Mineralogy QE351-399.2
spellingShingle	Sanshui Basin clinopyroxene phenocryst thermobarometry magma mixing fractional crystallization Mineralogy QE351-399.2 Peijia Chen Nianqiao Fang Xiaobo Yuan Geochemical Insights from Clinopyroxene Phenocrysts into the Magma Evolution of an Alkaline Magmatic System from the Sanshui Basin, South China
description	The Sanshui Basin is located at the northern continental margin of the South China Sea and characterized by a continental rift basin. The bimodal volcanic rocks in Sanshui Basin record the early Cenozoic magmatic activity in the South China Block, but the magmatic evolution that produced the bimodal volcanic rocks is poorly understood. Clinopyroxenes in bimodal volcanic rocks in the Sanshui Basin provide an opportunity to investigate magma during magma ascent. In this work, we classified nine types of clinopyroxene phenocrysts according to composition and texture in cogenetic basalt-trachyandesite-comenditic trachyte, while the composition of unzoned clinopyroxene have an evolution sequence of diopside-hedenbergite-aegirine along with an increase in trace element contents with a decrease of Mg<sup>#</sup>, indicating that the genesis of clinopyroxene was dominated by fractional crystallization in a closed magma system. However, the clinopyroxenes with reversed zoning and multiple zoning record the process of magma mixing and recharge indicating an open magma system. While fractional crystallization is the dominant process, magma mixing, recharge, and crystal settling were also found to influence magma evolution. Thermobarometric calculations showed that clinopyroxene crystallized a several structural levels in the crust during magma ascent. In this study, we established a magma plumbing system that provides new constraints for the magma evolution in the Sanshui Basin.
format	article
author	Peijia Chen Nianqiao Fang Xiaobo Yuan
author_facet	Peijia Chen Nianqiao Fang Xiaobo Yuan
author_sort	Peijia Chen
title	Geochemical Insights from Clinopyroxene Phenocrysts into the Magma Evolution of an Alkaline Magmatic System from the Sanshui Basin, South China
title_short	Geochemical Insights from Clinopyroxene Phenocrysts into the Magma Evolution of an Alkaline Magmatic System from the Sanshui Basin, South China
title_full	Geochemical Insights from Clinopyroxene Phenocrysts into the Magma Evolution of an Alkaline Magmatic System from the Sanshui Basin, South China
title_fullStr	Geochemical Insights from Clinopyroxene Phenocrysts into the Magma Evolution of an Alkaline Magmatic System from the Sanshui Basin, South China
title_full_unstemmed	Geochemical Insights from Clinopyroxene Phenocrysts into the Magma Evolution of an Alkaline Magmatic System from the Sanshui Basin, South China
title_sort	geochemical insights from clinopyroxene phenocrysts into the magma evolution of an alkaline magmatic system from the sanshui basin, south china
publisher	MDPI AG
publishDate	2021
url	https://doaj.org/article/ded42cc98c7b4c15ae17bbb80e5401b3
work_keys_str_mv	AT peijiachen geochemicalinsightsfromclinopyroxenephenocrystsintothemagmaevolutionofanalkalinemagmaticsystemfromthesanshuibasinsouthchina AT nianqiaofang geochemicalinsightsfromclinopyroxenephenocrystsintothemagmaevolutionofanalkalinemagmaticsystemfromthesanshuibasinsouthchina AT xiaoboyuan geochemicalinsightsfromclinopyroxenephenocrystsintothemagmaevolutionofanalkalinemagmaticsystemfromthesanshuibasinsouthchina
_version_	1718411165396107264

Geochemical Insights from Clinopyroxene Phenocrysts into the Magma Evolution of an Alkaline Magmatic System from the Sanshui Basin, South China

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