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Origin of the volcanic rocks erupted in the eastern Manus Basin: Basaltic andesite-andesite-dacite associations

There has been much recent interest in the origin of intermediate lava and several hypotheses are: 1) direct melting of the mantle under water-saturated conditions, 2) partial melting of altered crust, 3) fractional crystallization of parent magma, and 4) magma mixing of mafic magmas with dacitic/rh... Full description

Journal Title: Journal of Ocean University of China 2017, Vol.16(3), pp.389-402
Main Author: Ma, Yao
Other Authors: Zeng, Zhigang , Chen, Shuai , Yin, Xuebo , Wang, Xiaoyuan
Format: Electronic Article Electronic Article
Language: English
Subjects:
ID: ISSN: 1672-5182 ; E-ISSN: 1993-5021 ; DOI: 10.1007/s11802-017-3142-x
Link: http://dx.doi.org/10.1007/s11802-017-3142-x
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recordid: springer_jour10.1007/s11802-017-3142-x
title: Origin of the volcanic rocks erupted in the eastern Manus Basin: Basaltic andesite-andesite-dacite associations
format: Article
creator:
  • Ma, Yao
  • Zeng, Zhigang
  • Chen, Shuai
  • Yin, Xuebo
  • Wang, Xiaoyuan
subjects:
  • Eastern Manus Basin
  • fractional crystallization
  • volcanic rocks
ispartof: Journal of Ocean University of China, 2017, Vol.16(3), pp.389-402
description: There has been much recent interest in the origin of intermediate lava and several hypotheses are: 1) direct melting of the mantle under water-saturated conditions, 2) partial melting of altered crust, 3) fractional crystallization of parent magma, and 4) magma mixing of mafic magmas with dacitic/rhyolitic magmas. Volcanic rocks series ranging from basaltic andesite to dacite (SiO 2 ranges from 53.8 to 63.0 wt.%) from the eastern Manus Basin were detected for major and trace element compositions to understand their origin. Low H 2 O contents, positive correlations of La-SiO 2 and Yb-SiO 2 , oxygen isotope data and the indistinct change of trace element concentrations in oscillatory zoning of plagioclase phenocrysts rule out the models in which silicic lava results from direct melting of hydrous mantle, partial melting of altered oceanic crust or gabbros, and magma mixing, respectively. Besides, the geochemical data of whole rock and melt inclusions indicate that fractional crystallization plays a dominant role in generating the intermediate lava with subduction features.
language: eng
source:
identifier: ISSN: 1672-5182 ; E-ISSN: 1993-5021 ; DOI: 10.1007/s11802-017-3142-x
fulltext: fulltext
issn:
  • 1993-5021
  • 19935021
  • 1672-5182
  • 16725182
url: Link


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titleOrigin of the volcanic rocks erupted in the eastern Manus Basin: Basaltic andesite-andesite-dacite associations
creatorMa, Yao ; Zeng, Zhigang ; Chen, Shuai ; Yin, Xuebo ; Wang, Xiaoyuan
ispartofJournal of Ocean University of China, 2017, Vol.16(3), pp.389-402
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subjectEastern Manus Basin ; fractional crystallization ; volcanic rocks
descriptionThere has been much recent interest in the origin of intermediate lava and several hypotheses are: 1) direct melting of the mantle under water-saturated conditions, 2) partial melting of altered crust, 3) fractional crystallization of parent magma, and 4) magma mixing of mafic magmas with dacitic/rhyolitic magmas. Volcanic rocks series ranging from basaltic andesite to dacite (SiO 2 ranges from 53.8 to 63.0 wt.%) from the eastern Manus Basin were detected for major and trace element compositions to understand their origin. Low H 2 O contents, positive correlations of La-SiO 2 and Yb-SiO 2 , oxygen isotope data and the indistinct change of trace element concentrations in oscillatory zoning of plagioclase phenocrysts rule out the models in which silicic lava results from direct melting of hydrous mantle, partial melting of altered oceanic crust or gabbros, and magma mixing, respectively. Besides, the geochemical data of whole rock and melt inclusions indicate that fractional crystallization plays a dominant role in generating the intermediate lava with subduction features.
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descriptionThere has been much recent interest in the origin of intermediate lava and several hypotheses are: 1) direct melting of the mantle under water-saturated conditions, 2) partial melting of altered crust, 3) fractional crystallization of parent magma, and 4) magma mixing of mafic magmas with dacitic/rhyolitic magmas. Volcanic rocks series ranging from basaltic andesite to dacite (SiO 2 ranges from 53.8 to 63.0 wt.%) from the eastern Manus Basin were detected for major and trace element compositions to understand their origin. Low H 2 O contents, positive correlations of La-SiO 2 and Yb-SiO 2 , oxygen isotope data and the indistinct change of trace element concentrations in oscillatory zoning of plagioclase phenocrysts rule out the models in which silicic lava results from direct melting of hydrous mantle, partial melting of altered oceanic crust or gabbros, and magma mixing, respectively. Besides, the geochemical data of whole rock and melt inclusions indicate that fractional crystallization plays a dominant role in generating the intermediate lava with subduction features.
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abstractThere has been much recent interest in the origin of intermediate lava and several hypotheses are: 1) direct melting of the mantle under water-saturated conditions, 2) partial melting of altered crust, 3) fractional crystallization of parent magma, and 4) magma mixing of mafic magmas with dacitic/rhyolitic magmas. Volcanic rocks series ranging from basaltic andesite to dacite (SiO 2 ranges from 53.8 to 63.0 wt.%) from the eastern Manus Basin were detected for major and trace element compositions to understand their origin. Low H 2 O contents, positive correlations of La-SiO 2 and Yb-SiO 2 , oxygen isotope data and the indistinct change of trace element concentrations in oscillatory zoning of plagioclase phenocrysts rule out the models in which silicic lava results from direct melting of hydrous mantle, partial melting of altered oceanic crust or gabbros, and magma mixing, respectively. Besides, the geochemical data of whole rock and melt inclusions indicate that fractional crystallization plays a dominant role in generating the intermediate lava with subduction features.
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doi10.1007/s11802-017-3142-x
pages389-402
date2017-06-01