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Iron Isotope Behavior During Melt-Peridotite Interaction in Supra-subduction Zone Ophiolite From Northern Tibet
Zhang, Long1; Sun, Wei-dong2,3; Zhang, Zhao-Feng1; An, Yajun1; Liu, Fang1
2020-02-01
Source PublicationJOURNAL OF GEOPHYSICAL RESEARCH-SOLID EARTH
ISSN2169-9313
Volume125Issue:2Pages:17
Corresponding AuthorZhang, Long(zhanglong@gig.ac.cn) ; Sun, Wei-dong(weidongsun@qdio.ac.cn)
AbstractMelt-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.
DOI10.1029/2019JB018823
Indexed BySCI
Language英语
Funding ProjectStrategic 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 Research AreaGeochemistry & Geophysics
WOS SubjectGeochemistry & Geophysics
WOS IDWOS:000530895200017
PublisherAMER GEOPHYSICAL UNION
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Document Type期刊论文
Identifierhttp://ir.qdio.ac.cn/handle/337002/167383
Collection深海极端环境与生命过程研究中心
Corresponding AuthorZhang, Long; Sun, Wei-dong
Affiliation1.Chinese Acad Sci, Guangzhou Inst Geochem, State Key Lab Isotope Geochem, Guangzhou, Peoples R China
2.Qingdao Natl Lab Marine Sci & Technol, Lab Marine Mineral Resources, Qingdao, Peoples R China
3.Chinese Acad Sci, Ctr Deep Sea Res, Inst Oceanol, Qingdao, Peoples R China
Corresponding Author AffilicationInstitute of Oceanology, Chinese Academy of Sciences
Recommended Citation
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.
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