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

IOCAS-IR

	Characteristics of silicon and oxygen isotopic compositions of basalts near East Pacific Rise 13°N
	WANG Xiaoyuan ; ZHAO Huijing ; ZENG Zhigang ; YIN Xuebo ; CHEN Shuai ; MA Yao
发表期刊	Acta Oceanologica Sinica
ISSN	0253-505X
	2013-12-15
出版年	2013
卷号	v.32 期号:12 页码:106-110
文献类型	CNKI期刊论文
摘要	In this study,13 groups of silicon and oxygen isotopes and major elements of the basalts near the East Pacific Rise 13°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 ofδ30Si of(0.18±0.22)‰.Theδ18O values range from 4.1‰ to 6.4‰ with a meanδ18O value of(+5.35±0.73)‰.Since theδ30Si values increase in the series of basalt-basaltic andesite-andesite,andδ18O values display a positive correlation with the SiO2content,we propose that the fractionation of silicon and oxygen isotopes is influenced by the SiO2content 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 lowerδ18O andδ30Si 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 inδ30Si andδ18O between our samples and a normal MORB are cause by the enriched components in E-MORBs.
关键词	silicon and oxygen isotopes basalt East Pacific Rise near 13°N
CNKI专辑号	A;
CNKI专辑名称	基础科学;
CNKI专题号	A010;A011;
CNKI专题名称	海洋学;地质学;
分类号	P736.3
收录类别	中科院核心 ; 中科院扩展
语种	英文;
资助项目(基金）	The National Key Basic Research Program of China under contract No.2013CB429700 ; National Special Fund for the 12th Five Year Plan of COMRA under contract Nos DY125-12-R-02 and DY125-11-R-05 ; Shandong Province Natural Science Foundation of China for Distinguished Young Scholars under contract No.JQ200913 ; the National Natural Science Foundation of China under contract Nos 40830849,40976027 and 40906029
文献类型	CNKI期刊论文
条目标识符	http://ir.qdio.ac.cn/handle/337002/190622
专题	中国科学院海洋研究所
作者单位	1.SeafloorHydrothermalActivityLaboratoryoftheKeyLaboratoryofMarineGeologyandEnvironment,InstituteofOceanology,ChineseAcademyofSciences 2.GraduateUniversityofChineseAcademyofSciences
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°N. 2013.