Disequilibrium phenocrystic assemblage within dacites reveals magma mixing and stratified chamber after crustal assimilation at El Hoyazo volcano, SE Spain

Hiyori Hiwatashi; Masao Ban; Antonio M. Álvarez-valero; Leo M. Kriegsman; Motohiro Sato

doi:10.1016/j.lithos.2020.105849

Disequilibrium phenocrystic assemblage within dacites reveals magma mixing and stratified chamber after crustal assimilation at El Hoyazo volcano, SE Spain

Hiyori Hiwatashi, Masao Ban, Antonio M. Álvarez-valero, Leo M. Kriegsman, Motohiro Sato

Naturalis Biodiversity Center

Research output: Contribution to journal › Article › Academic › peer-review

Abstract

In volcanic areas where evolved and primitive magmas coexist, it is common to observe evidence of magma mixing. At the Neogene silicic volcano of El Hoyazo in SE Spain, the detailed petrological and geochemical characteristics of the phenocrysts (plagioclase, biotite, amphibole and pyroxene) as well as their host dacitic lavas allow the reconstruction of the structure of the magma plumbing system. Microtextures, modal abundances, and geochemistry of zoned phenocrysts reveal a stratified magma composed of (i) high-SiO ₂ dacites with An-poor (<50%) plagioclase and Mg-poor biotite; (ii) high-SiO ₂ andesites with intermediate-An (50–70%) plagioclase and intermediate-Mg biotite; and (iii) an andesitic magma with An-rich (>80%) plagioclase, Mg-rich pyroxene, and tschermakitic hornblende, whose zoning records different crystallization depths during magma ascent. Evidence from the hornblende varieties and from mafic enclaves or inclusions indicates that the stratified chamber was repeatedly injected by hotter magmas from greater depth.

Original language	English
Article number	105849
Pages (from-to)	1-17
Number of pages	17
Journal	Lithos
Volume	380-381
DOIs	https://doi.org/10.1016/j.lithos.2020.105849
Publication status	Published - Jan 2021

Bibliographical note

Funding Information:
This research was supported by Grant-in-Aid for Scientific Research from the Japan Society for the Promotion of Science (JSPS) to M. Ban ( 22540487 ; 17K05701 ), and USAL-2019 project (Programa Propio - mod. 1B) to A-V. H.H. acknowledges the funded stays at the University of Salamanca (Dept. of Geology and Laboratorio de Isótopos Estables – NUCLEUS) in 2018 and 2019 by the same JSPS grants. We highly appreciate the constructive and in-depth reviews by Joan Martí, Helena Albert and editor Greg Shellnutt that helped to enhance this contribution. We are also grateful to Prof. Emeritus K. Nakajima for assistance in the preparation and observation of thin sections, Takashi Yuguchi and Kae Tsunematsu for valuable suggestions in this study.

Publisher Copyright:
© 2020 Elsevier B.V.

Keywords

Crustal assimilation
Hornblende
Magma injections
Magmatic inclusions/enclaves
Rapid magma ascent
Resorption textures

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10.1016/j.lithos.2020.105849

1-s2.0-S0024493720304849-mainFinal published version, 6.92 MBLicence: Taverne

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@article{8691a1575be74591afe518fbe918b6df,

title = "Disequilibrium phenocrystic assemblage within dacites reveals magma mixing and stratified chamber after crustal assimilation at El Hoyazo volcano, SE Spain",

abstract = "In volcanic areas where evolved and primitive magmas coexist, it is common to observe evidence of magma mixing. At the Neogene silicic volcano of El Hoyazo in SE Spain, the detailed petrological and geochemical characteristics of the phenocrysts (plagioclase, biotite, amphibole and pyroxene) as well as their host dacitic lavas allow the reconstruction of the structure of the magma plumbing system. Microtextures, modal abundances, and geochemistry of zoned phenocrysts reveal a stratified magma composed of (i) high-SiO 2 dacites with An-poor (<50%) plagioclase and Mg-poor biotite; (ii) high-SiO 2 andesites with intermediate-An (50–70%) plagioclase and intermediate-Mg biotite; and (iii) an andesitic magma with An-rich (>80%) plagioclase, Mg-rich pyroxene, and tschermakitic hornblende, whose zoning records different crystallization depths during magma ascent. Evidence from the hornblende varieties and from mafic enclaves or inclusions indicates that the stratified chamber was repeatedly injected by hotter magmas from greater depth. ",

keywords = "Crustal assimilation, Hornblende, Magma injections, Magmatic inclusions/enclaves, Rapid magma ascent, Resorption textures",

author = "Hiyori Hiwatashi and Masao Ban and {\'A}lvarez-valero, {Antonio M.} and Kriegsman, {Leo M.} and Motohiro Sato",

note = "Funding Information: This research was supported by Grant-in-Aid for Scientific Research from the Japan Society for the Promotion of Science (JSPS) to M. Ban ( 22540487 ; 17K05701 ), and USAL-2019 project (Programa Propio - mod. 1B) to A-V. H.H. acknowledges the funded stays at the University of Salamanca (Dept. of Geology and Laboratorio de Is{\'o}topos Estables – NUCLEUS) in 2018 and 2019 by the same JSPS grants. We highly appreciate the constructive and in-depth reviews by Joan Mart{\'i}, Helena Albert and editor Greg Shellnutt that helped to enhance this contribution. We are also grateful to Prof. Emeritus K. Nakajima for assistance in the preparation and observation of thin sections, Takashi Yuguchi and Kae Tsunematsu for valuable suggestions in this study. Publisher Copyright: {\textcopyright} 2020 Elsevier B.V.",

year = "2021",

month = jan,

doi = "10.1016/j.lithos.2020.105849",

language = "English",

volume = "380-381",

pages = "1--17",

journal = "Lithos",

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AU - Hiwatashi, Hiyori

AU - Ban, Masao

AU - Álvarez-valero, Antonio M.

AU - Kriegsman, Leo M.

AU - Sato, Motohiro

N1 - Funding Information: This research was supported by Grant-in-Aid for Scientific Research from the Japan Society for the Promotion of Science (JSPS) to M. Ban ( 22540487 ; 17K05701 ), and USAL-2019 project (Programa Propio - mod. 1B) to A-V. H.H. acknowledges the funded stays at the University of Salamanca (Dept. of Geology and Laboratorio de Isótopos Estables – NUCLEUS) in 2018 and 2019 by the same JSPS grants. We highly appreciate the constructive and in-depth reviews by Joan Martí, Helena Albert and editor Greg Shellnutt that helped to enhance this contribution. We are also grateful to Prof. Emeritus K. Nakajima for assistance in the preparation and observation of thin sections, Takashi Yuguchi and Kae Tsunematsu for valuable suggestions in this study. Publisher Copyright: © 2020 Elsevier B.V.

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N2 - In volcanic areas where evolved and primitive magmas coexist, it is common to observe evidence of magma mixing. At the Neogene silicic volcano of El Hoyazo in SE Spain, the detailed petrological and geochemical characteristics of the phenocrysts (plagioclase, biotite, amphibole and pyroxene) as well as their host dacitic lavas allow the reconstruction of the structure of the magma plumbing system. Microtextures, modal abundances, and geochemistry of zoned phenocrysts reveal a stratified magma composed of (i) high-SiO 2 dacites with An-poor (<50%) plagioclase and Mg-poor biotite; (ii) high-SiO 2 andesites with intermediate-An (50–70%) plagioclase and intermediate-Mg biotite; and (iii) an andesitic magma with An-rich (>80%) plagioclase, Mg-rich pyroxene, and tschermakitic hornblende, whose zoning records different crystallization depths during magma ascent. Evidence from the hornblende varieties and from mafic enclaves or inclusions indicates that the stratified chamber was repeatedly injected by hotter magmas from greater depth.

AB - In volcanic areas where evolved and primitive magmas coexist, it is common to observe evidence of magma mixing. At the Neogene silicic volcano of El Hoyazo in SE Spain, the detailed petrological and geochemical characteristics of the phenocrysts (plagioclase, biotite, amphibole and pyroxene) as well as their host dacitic lavas allow the reconstruction of the structure of the magma plumbing system. Microtextures, modal abundances, and geochemistry of zoned phenocrysts reveal a stratified magma composed of (i) high-SiO 2 dacites with An-poor (<50%) plagioclase and Mg-poor biotite; (ii) high-SiO 2 andesites with intermediate-An (50–70%) plagioclase and intermediate-Mg biotite; and (iii) an andesitic magma with An-rich (>80%) plagioclase, Mg-rich pyroxene, and tschermakitic hornblende, whose zoning records different crystallization depths during magma ascent. Evidence from the hornblende varieties and from mafic enclaves or inclusions indicates that the stratified chamber was repeatedly injected by hotter magmas from greater depth.

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KW - Hornblende

KW - Magma injections

KW - Magmatic inclusions/enclaves

KW - Rapid magma ascent

KW - Resorption textures

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DO - 10.1016/j.lithos.2020.105849

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SN - 0024-4937

VL - 380-381

SP - 1

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JO - Lithos

JF - Lithos

M1 - 105849

ER -

Disequilibrium phenocrystic assemblage within dacites reveals magma mixing and stratified chamber after crustal assimilation at El Hoyazo volcano, SE Spain

Abstract

Bibliographical note

Keywords

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