Iron Isotope Behavior During Melt-Peridotite Interaction in Supra-subduction Zone Ophiolite From Northern Tibet

doi:10.1029/2019JB018823

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	Iron Isotope Behavior During Melt-Peridotite Interaction in Supra-subduction Zone Ophiolite From Northern Tibet
	Zhang, Long 1; Sun, Wei-dong 2,3; Zhang, Zhao-Feng 1; An, Yajun 1; Liu, Fang 1
刊名	JOURNAL OF GEOPHYSICAL RESEARCH-SOLID EARTH
	2020-02-01
卷号	125 期号:2 页码:17
ISSN号	2169-9313
DOI	10.1029/2019JB018823
通讯作者	Zhang, Long(zhanglong@gig.ac.cn) ; Sun, Wei-dong(weidongsun@qdio.ac.cn)
英文摘要	Melt-peridotite interaction has the ability to modify the delta Fe-56 of peridotite. However, iron isotopic fractionation during melt-peridotitc interaction is not well understood at present. In this study, we present high-precision iron isotopic data for serpentinized and carbonated peridotite from the Yushigou supra-subduction zone ophiolite in the North Qilian orogen of northern Tibet, to provide insights into iron isotope behavior during melt-peridotite interaction in the mantle wedge. High-Cr and high-Al dunites coexist with harzburgitc in the Yushigou ophiolite. The high-Cr and high-Al dunites were produced by interaction of peridotite with boninitic melt and tholeiitic melt, respectively. Serpentinization and carbonation have negligible influence on delta Fe-56 of the peridotite. The harzburgite mostly has delta Fe-56 ranging from 0.055 +/- 0.029 parts per thousand to 0.056 +/- 0.030 parts per thousand, which overlaps with delta Fe-56 of abyssal peridotite. The high-Al dunite is enriched in FcO, but it has delta Fe-56 (0.004 +/- 0.034 parts per thousand-0.083 +/- 0.064 parts per thousand) similar to the harzburgitc. In contrast, the high-Cr dunite displays a large range in delta Fe-56 from -0.173 +/- 0.017 parts per thousand, to 0.173 +/- 0.057 parts per thousand. Moreover, delta Fe-56 of the high-Cr dunite is negatively correlated with its FeO content, which is ascribed to kinetic iron isotopic fractionation during melt-peridotite interaction. Surprisingly, distinct iron isotope behavior during melt-peridotitc interaction recorded by the Yushigou peridotitc can well explain the large variation of FeO and delta Fe-56 in abyssal peridotite and mantle wedge peridotite on a global scale.
资助项目	Strategic Priority Research Program of the Chinese Academy of Sciences[XDB18000000] ; National Key R&D Program of China[2016YFC0600408] ; Natural Science Foundation of China[41703029] ; China Postdoctoral Science Foundation[2016LH00023]
WOS研究方向	Geochemistry & Geophysics
语种	英语
出版者	AMER GEOPHYSICAL UNION
WOS记录号	WOS:000530895200017
内容类型	期刊论文
源URL	[http://ir.qdio.ac.cn/handle/337002/167382]
专题	海洋研究所_深海极端环境与生命过程研究中心
通讯作者	Zhang, Long; Sun, Wei-dong
作者单位	1.Chinese Acad Sci, Guangzhou Inst Geochem, State Key Lab Isotope Geochem, Guangzhou, Peoples R China 2.Chinese Acad Sci, Ctr Deep Sea Res, Inst Oceanol, Qingdao, Peoples R China 3.Qingdao Natl Lab Marine Sci & Technol, Lab Marine Mineral Resources, Qingdao, Peoples R China
推荐引用方式 GB/T 7714	Zhang, Long,Sun, Wei-dong,Zhang, Zhao-Feng,et al. Iron Isotope Behavior During Melt-Peridotite Interaction in Supra-subduction Zone Ophiolite From Northern Tibet[J]. JOURNAL OF GEOPHYSICAL RESEARCH-SOLID EARTH,2020,125(2):17.
APA	Zhang, Long,Sun, Wei-dong,Zhang, Zhao-Feng,An, Yajun,&Liu, Fang.(2020).Iron Isotope Behavior During Melt-Peridotite Interaction in Supra-subduction Zone Ophiolite From Northern Tibet.JOURNAL OF GEOPHYSICAL RESEARCH-SOLID EARTH,125(2),17.
MLA	Zhang, Long,et al."Iron Isotope Behavior During Melt-Peridotite Interaction in Supra-subduction Zone Ophiolite From Northern Tibet".JOURNAL OF GEOPHYSICAL RESEARCH-SOLID EARTH 125.2(2020):17.