Characteristics of silicon and oxygen isotopic compositions of basalts near East Pacific Rise 13&#176;N

WANG Xiaoyuan; ZHAO Huijing; ZENG Zhigang; YIN Xuebo; CHEN Shuai; MA Yao

doi:10.1007/s13131-013-0396-z

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Article Navigation > Acta Oceanologica Sinica > 2013 > 32(12): 104-108

WANG Xiaoyuan, ZHAO Huijing, ZENG Zhigang, YIN Xuebo, CHEN Shuai, MA Yao. Characteristics of silicon and oxygen isotopic compositions of basalts near East Pacific Rise 13°N[J]. Acta Oceanologica Sinica, 2013, 32(12): 104-108. doi: 10.1007/s13131-013-0396-z

Citation:

WANG Xiaoyuan, ZHAO Huijing, ZENG Zhigang, YIN Xuebo, CHEN Shuai, MA Yao. Characteristics of silicon and oxygen isotopic compositions of basalts near East Pacific Rise 13°N[J]. Acta Oceanologica Sinica, 2013, 32(12): 104-108. doi: 10.1007/s13131-013-0396-z

Citation:

WANG Xiaoyuan, ZHAO Huijing, ZENG Zhigang, YIN Xuebo, CHEN Shuai, MA Yao. Characteristics of silicon and oxygen isotopic compositions of basalts near East Pacific Rise 13°N[J]. Acta Oceanologica Sinica, 2013, 32(12): 104-108. doi: 10.1007/s13131-013-0396-z

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

doi: 10.1007/s13131-013-0396-z

1.
Seafloor Hydrothermal Activity Laboratory of the Key Laboratory of Marine Geology and Environment, Institute of Oceanology, Chinese Academy of Sciences, Qingdao 266071, China
2.
Seafloor Hydrothermal Activity Laboratory of the Key Laboratory of Marine Geology and Environment, Institute of Oceanology, Chinese Academy of Sciences, Qingdao 266071, China;Graduate University of Chinese Academy of Sciences, Beijing 100049, China

Received Date: 2013-05-14
Rev Recd Date: 2013-08-24

Abstract

Abstract

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, δ³⁰Si values of basalts vary from -0.4‰ to 0.2‰ with a mean value of δ³⁰Si of (-0.18±0.22)‰. The δ¹⁸O values range from 4.1‰ to 6.4‰ with a mean δ¹⁸O value of (+5.35±0.73)‰. Since the δ³⁰Si values increase in the series of basalt-basaltic andesite- andesite, and δ¹⁸O values display a positive correlation with the SiO₂ content, we propose that the fractionation of silicon and oxygen isotopes is influenced by the SiO₂ 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 δ¹⁸O and δ³⁰Si 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 δ³⁰Si and δ¹⁸O between our samples and a normal MORB are cause by the enriched components in E-MORBs.
- silicon and oxygen isotopes,
- basalt,
- East Pacific Rise near 13°,
- N

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