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

CORC > 海洋研究所 > 中国科学院海洋研究所 > 海洋地质与环境重点实验室

	Characteristics of silicon and oxygen isotopic compositions of basalts near East Pacific Rise 13 degrees N
	Wang Xiaoyuan 1; Zhao Huijing 1,2; Zeng Zhigang 1; Yin Xuebo 1; Chen Shuai 1; Ma Yao1,2
刊名	ACTA OCEANOLOGICA SINICA
	2013-12-01
卷号	32 期号:12 页码:104-108
关键词	silicon and oxygen isotopes basalt East Pacific Rise near 13 degrees N
ISSN号	0253-505X
通讯作者	Zeng, ZG
中文摘要	In this study, 13 groups of silicon and oxygen isotopes and major elements of the basalts near the East Pacific Rise 13 degrees N are used to study the fractionation of silicon and oxygen isotopes. Among these data, delta Si-30 values of basalts vary from -0.4 parts per thousand to 0.2 parts per thousand with a mean value of delta Si-30 of (-0.18 +/- 0.22)parts per thousand. The delta O-18 values range from 4.1 parts per thousand to 6.4 parts per thousand with a mean delta O-18 value of (+5.35 +/- 0.73)parts per thousand. Since the delta Si-30 values increase in the series of basalt-basaltic andesite- andesite, and delta O-18 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 delta O-18 and delta Si-30 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 delta Si-30 and delta O-18 between our samples and a normal MORB are cause by the enriched components in E-MORBs.
英文摘要	In this study, 13 groups of silicon and oxygen isotopes and major elements of the basalts near the East Pacific Rise 13 degrees N are used to study the fractionation of silicon and oxygen isotopes. Among these data, delta Si-30 values of basalts vary from -0.4 parts per thousand to 0.2 parts per thousand with a mean value of delta Si-30 of (-0.18 +/- 0.22)parts per thousand. The delta O-18 values range from 4.1 parts per thousand to 6.4 parts per thousand with a mean delta O-18 value of (+5.35 +/- 0.73)parts per thousand. Since the delta Si-30 values increase in the series of basalt-basaltic andesite- andesite, and delta O-18 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 delta O-18 and delta Si-30 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 delta Si-30 and delta O-18 between our samples and a normal MORB are cause by the enriched components in E-MORBs.
学科主题	Oceanography
WOS标题词	Science & Technology ; Physical Sciences
类目[WOS]	Oceanography
研究领域[WOS]	Oceanography
关键词[WOS]	MID-ATLANTIC RIDGE ; PROCESSES BENEATH ; CORE FORMATION ; NAZCA PLATE ; MANTLE ; FRACTIONATION ; HETEROGENEITY ; GEOCHEMISTRY ; SIGNATURES ; EVOLUTION
收录类别	SCI
原文出处	10.1007/s13131-013-0396-z
语种	英语
WOS记录号	WOS:000328528400013
公开日期	2014-07-17
内容类型	期刊论文
源URL	[http://ir.qdio.ac.cn/handle/337002/16292]
专题	海洋研究所_海洋地质与环境重点实验室
作者单位	1.Chinese Acad Sci, Inst Oceanol, Seafloor Hydrothermal Activ Lab, Key Lab Marine Geol & Environm, Qingdao 266071, Peoples R China 2.Chinese Acad Sci, Grad Univ, Beijing 100049, Peoples R China
推荐引用方式 GB/T 7714	Wang Xiaoyuan,Zhao Huijing,Zeng Zhigang,et al. Characteristics of silicon and oxygen isotopic compositions of basalts near East Pacific Rise 13 degrees N[J]. ACTA OCEANOLOGICA SINICA,2013,32(12):104-108.
APA	Wang Xiaoyuan,Zhao Huijing,Zeng Zhigang,Yin Xuebo,Chen Shuai,&Ma Yao.(2013).Characteristics of silicon and oxygen isotopic compositions of basalts near East Pacific Rise 13 degrees N.ACTA OCEANOLOGICA SINICA,32(12),104-108.
MLA	Wang Xiaoyuan,et al."Characteristics of silicon and oxygen isotopic compositions of basalts near East Pacific Rise 13 degrees N".ACTA OCEANOLOGICA SINICA 32.12(2013):104-108.