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Triple oxygen isotope constraints on the origin of ocean island basalts
Xiaobin Cao;  Huiming Bao;  Caihong Gao;  Yun Liu;  Fang Huang;  Yongbo Peng;  Yining Zhang
2019
发表期刊Acta Geochim
页码1-8
摘要

Understanding the origin of ocean island basalts (OIB) has important bearings on Earth’s deep mantle. Although it is widely accepted that subducted oceanic crust, as a consequence of plate tectonics, contributes material to OIB’s formation, its exact fraction in OIB’s mantle source remains ambiguous largely due to uncertainties associated with existing geochemical proxies. Here we show, through theoretical calculation, that unlike many known proxies, triple oxygen isotope compositions (i.e. D17O) in olivine samples are not affected by crystallization and partial melting. This unique feature, therefore, allows olivine D17O values to identify subducted oceanic crusts in OIB’s mantle source. Furthermore, the fractions of subducted ocean sediments and hydrothermally altered oceanic crust in OIB’s mantle source can be quantified using their characteristic D17O values. Based on published D17O data, we estimated the fraction of subducted oceanic crust to be as high as 22.3% in certain OIB, but the affected region in the respective mantle plume is likely to be limited.

关键词Triple Oxygen Isotope helium Isotope ocean Island Basalts mantle Plume mantle Heterogeneity crustal Recycling
收录类别EI
语种英语
文献类型期刊论文
条目标识符http://ir.gyig.ac.cn/handle/42920512-1/10622
专题矿床地球化学国家重点实验室
作者单位1.Department of Geology and Geophysics, Louisiana State University, Baton Rouge, LA 70803, USA
2.State Key Laboratory of Ore Deposit Geochemistry, Institute of Geochemistry, Chinese Academy of Sciences, Guiyang 550002, China
3.CAS Key Laboratory of Crust-Mantle Materials and Environments, School of Earth and Space Sciences, USTC, Hefei 230026, China
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Xiaobin Cao;Huiming Bao;Caihong Gao;Yun Liu;Fang Huang;Yongbo Peng;Yining Zhang. Triple oxygen isotope constraints on the origin of ocean island basalts[J]. Acta Geochim,2019:1-8.
APA Xiaobin Cao;Huiming Bao;Caihong Gao;Yun Liu;Fang Huang;Yongbo Peng;Yining Zhang.(2019).Triple oxygen isotope constraints on the origin of ocean island basalts.Acta Geochim,1-8.
MLA Xiaobin Cao;Huiming Bao;Caihong Gao;Yun Liu;Fang Huang;Yongbo Peng;Yining Zhang."Triple oxygen isotope constraints on the origin of ocean island basalts".Acta Geochim (2019):1-8.
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