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Characteristics of silicon and oxygen isotopic compositions of basalts near East Pacific Rise 13°N

In this study, 13 groups of silicon and oxygen isotopes and major elements of the basalts near the East Pacific Rise 13°N are used to study the fractionation of silicon and oxygen isotopes. Among these data, Δ 30 Si values of basalts vary from −0.4‰ to 0.2‰ with a mean value of Δ 30 Si of (−0.18±0.2... Full description

Journal Title: Acta Oceanologica Sinica 2013, Vol.32(12), pp.104-108
Main Author: Wang, Xiaoyuan
Other Authors: Zhao, Huijing , Zeng, Zhigang , Yin, Xuebo , Chen, Shuai , Ma, Yao
Format: Electronic Article Electronic Article
Language: English
Subjects:
ID: ISSN: 0253-505X ; E-ISSN: 1869-1099 ; DOI: 10.1007/s13131-013-0396-z
Link: http://dx.doi.org/10.1007/s13131-013-0396-z
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recordid: springer_jour10.1007/s13131-013-0396-z
title: Characteristics of silicon and oxygen isotopic compositions of basalts near East Pacific Rise 13°N
format: Article
creator:
  • Wang, Xiaoyuan
  • Zhao, Huijing
  • Zeng, Zhigang
  • Yin, Xuebo
  • Chen, Shuai
  • Ma, Yao
subjects:
  • silicon and oxygen isotopes
  • basalt
  • East Pacific Rise near 13°N
ispartof: Acta Oceanologica Sinica, 2013, Vol.32(12), pp.104-108
description: In this study, 13 groups of silicon and oxygen isotopes and major elements of the basalts near the East Pacific Rise 13°N are used to study the fractionation of silicon and oxygen isotopes. Among these data, Δ 30 Si values of basalts vary from −0.4‰ to 0.2‰ with a mean value of Δ 30 Si of (−0.18±0.22)‰. The δ 18 O values range from 4.1‰ to 6.4‰ with a mean Δ 18 O value of (+5.35±0.73)‰. Since the δ 30 Si values increase in the series of basalt-basaltic andesite-andesite, and δ 18 O values display a positive correlation with the SiO 2 content, we propose that the fractionation of silicon and oxygen isotopes is influenced by the SiO 2 content in igneous rocks. Compared with the igneous rocks from Manus Basin with clinopyroxene as their dominant mineral phase, MORBs in this study containing olivine and plagioclase as primary minerals have lower Δ 18 O and Δ 30 Si values, indicating that the fractionation of silicon and oxygen isotopes is also affected by different Si-O bridges in silicate minerals. Furthermore, our samples from the EPR are defined as E-MORB based on K/Ti ratios. Probably, the difference in Δ 30 Si and Δ 18 O between our samples and a normal MORB are cause by the enriched components in E-MORBs.
language: eng
source:
identifier: ISSN: 0253-505X ; E-ISSN: 1869-1099 ; DOI: 10.1007/s13131-013-0396-z
fulltext: fulltext
issn:
  • 1869-1099
  • 18691099
  • 0253-505X
  • 0253505X
url: Link


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titleCharacteristics of silicon and oxygen isotopic compositions of basalts near East Pacific Rise 13°N
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subjectsilicon and oxygen isotopes ; basalt ; East Pacific Rise near 13°N
descriptionIn this study, 13 groups of silicon and oxygen isotopes and major elements of the basalts near the East Pacific Rise 13°N are used to study the fractionation of silicon and oxygen isotopes. Among these data, Δ 30 Si values of basalts vary from −0.4‰ to 0.2‰ with a mean value of Δ 30 Si of (−0.18±0.22)‰. The δ 18 O values range from 4.1‰ to 6.4‰ with a mean Δ 18 O value of (+5.35±0.73)‰. Since the δ 30 Si values increase in the series of basalt-basaltic andesite-andesite, and δ 18 O values display a positive correlation with the SiO 2 content, we propose that the fractionation of silicon and oxygen isotopes is influenced by the SiO 2 content in igneous rocks. Compared with the igneous rocks from Manus Basin with clinopyroxene as their dominant mineral phase, MORBs in this study containing olivine and plagioclase as primary minerals have lower Δ 18 O and Δ 30 Si values, indicating that the fractionation of silicon and oxygen isotopes is also affected by different Si-O bridges in silicate minerals. Furthermore, our samples from the EPR are defined as E-MORB based on K/Ti ratios. Probably, the difference in Δ 30 Si and Δ 18 O between our samples and a normal MORB are cause by the enriched components in E-MORBs.
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abstractIn this study, 13 groups of silicon and oxygen isotopes and major elements of the basalts near the East Pacific Rise 13°N are used to study the fractionation of silicon and oxygen isotopes. Among these data, Δ 30 Si values of basalts vary from −0.4‰ to 0.2‰ with a mean value of Δ 30 Si of (−0.18±0.22)‰. The δ 18 O values range from 4.1‰ to 6.4‰ with a mean Δ 18 O value of (+5.35±0.73)‰. Since the δ 30 Si values increase in the series of basalt-basaltic andesite-andesite, and δ 18 O values display a positive correlation with the SiO 2 content, we propose that the fractionation of silicon and oxygen isotopes is influenced by the SiO 2 content in igneous rocks. Compared with the igneous rocks from Manus Basin with clinopyroxene as their dominant mineral phase, MORBs in this study containing olivine and plagioclase as primary minerals have lower Δ 18 O and Δ 30 Si values, indicating that the fractionation of silicon and oxygen isotopes is also affected by different Si-O bridges in silicate minerals. Furthermore, our samples from the EPR are defined as E-MORB based on K/Ti ratios. Probably, the difference in Δ 30 Si and Δ 18 O between our samples and a normal MORB are cause by the enriched components in E-MORBs.
copBerlin/Heidelberg
pubSpringer Berlin Heidelberg
doi10.1007/s13131-013-0396-z
pages104-108
date2013-12