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Sub-arc mantle heterogeneity in oxygen isotopes: evidence from Permian mafic-ultramafic intrusions in the Central Asian Orogenic Belt
Xue, Shengchao1,2; Li, Chusi1,3; Qin, Kezhang2; Yao, Zhuosen2,4; Ripley, Edward M.3
2018-11-01
发表期刊CONTRIBUTIONS TO MINERALOGY AND PETROLOGY
ISSN0010-7999
卷号173期号:11页码:13
摘要Integrated zircon-olivine O-Hf isotope data have been successfully used to unravel the nature of the source mantle for the early Permian post-collisional mafic-ultramafic intrusive rocks in the southern margin of the Central Asian Orogenic Belt in NW China. Olivine crystals with forsterite (Fo) contents varying from 91 to 87mol% from the Permian Pobei mafic-ultramafic complex in the region yield highly elevated O-18 from 6.0 to 7.2 parts per thousand. These values are much higher than typical mantle values (5.3 parts per thousand) and are apparently at odds with the mantle-like epsilon(Nd)(t) values of whole rocks (4.9-5.4). Magmatic zircon crystals from troctolite and gabbroic rocks show divergent oxygen and hafnium isotopic compositions: mantle-like epsilon(Hf)(t) values from 5.1 to 11.9 and crust-like O-18 values from 7.6 to 10.1 parts per thousand. The observed increase of O-18 values from olivine (an early crystallizing phase) to zircon (a late crystallizing phase) in the mafic-ultramafic rocks is generally consistent with an AFC process. However, this process cannot fully explain the highly elevated O-18 values (6-7 parts per thousand) for the most primitive olivine containing Fo as high as mantle olivine (>90mol%) and the mantle-like Hf isotope composition of zircon. Mixing calculation indicates that such highly unusual isotope compositions can be explained by the previous source mantle contamination with subducted sediment-derived melts and slab-derived fluids. Our results show that the combination of zircon O-Hf isotopes and olivine oxygen isotopes is more effective than the data of zircon or olivine alone to distinguish the effect of AFC process from source contamination. The results from this study provide a new line of evidence that the sub-arc mantle is not homogeneous in oxygen isotopes.
关键词Zircon O-Hf isotopes Olivine oxygen isotopes Mafic-ultramafic rock Subducted sediment Slab-derived fluids Central Asian Orogenic Belt
DOI10.1007/s00410-018-1521-y
资助者China Postdoctoral Science Foundation ; China Postdoctoral Science Foundation ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; China Postdoctoral Science Foundation ; China Postdoctoral Science Foundation ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; China Postdoctoral Science Foundation ; China Postdoctoral Science Foundation ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; China Postdoctoral Science Foundation ; China Postdoctoral Science Foundation ; National Natural Science Foundation of China ; National Natural Science Foundation of China
关键词[WOS]U-PB AGE ; NW-CHINA ; GEOCHEMICAL CONSTRAINTS ; CONTINENTAL-CRUST ; TRACE-ELEMENT ; POSTCOLLISIONAL MAGMATISM ; ZIRCON MEGACRYSTS ; WORKING REFERENCE ; EASTERN TIANSHAN ; DEEP SUBDUCTION
语种英语
资助项目China Postdoctoral Science Foundation[2016M600109] ; National Natural Science Foundation of China[41030424] ; National Natural Science Foundation of China[41472075]
资助者China Postdoctoral Science Foundation ; China Postdoctoral Science Foundation ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; China Postdoctoral Science Foundation ; China Postdoctoral Science Foundation ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; China Postdoctoral Science Foundation ; China Postdoctoral Science Foundation ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; China Postdoctoral Science Foundation ; China Postdoctoral Science Foundation ; National Natural Science Foundation of China ; National Natural Science Foundation of China
WOS研究方向Geochemistry & Geophysics ; Mineralogy
WOS类目Geochemistry & Geophysics ; Mineralogy
WOS记录号WOS:000448146100003
出版者SPRINGER
引用统计
文献类型期刊论文
条目标识符http://ir.iggcas.ac.cn/handle/132A11/89132
专题矿产资源研究院重点实验室
通讯作者Li, Chusi
作者单位1.China Univ Geosci, State Key Lab Geol Proc & Mineral Resources, Beijing 100083, Peoples R China
2.Chinese Acad Sci, Inst Geol & Geophys, Key Lab Mineral Resources, Beijing 100029, Peoples R China
3.Indiana Univ, Dept Earth & Atmospher Sci, Bloomington, IN 47405 USA
4.Univ Chinese Acad Sci, Beijing 100049, Peoples R China
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Xue, Shengchao,Li, Chusi,Qin, Kezhang,et al. Sub-arc mantle heterogeneity in oxygen isotopes: evidence from Permian mafic-ultramafic intrusions in the Central Asian Orogenic Belt[J]. CONTRIBUTIONS TO MINERALOGY AND PETROLOGY,2018,173(11):13.
APA Xue, Shengchao,Li, Chusi,Qin, Kezhang,Yao, Zhuosen,&Ripley, Edward M..(2018).Sub-arc mantle heterogeneity in oxygen isotopes: evidence from Permian mafic-ultramafic intrusions in the Central Asian Orogenic Belt.CONTRIBUTIONS TO MINERALOGY AND PETROLOGY,173(11),13.
MLA Xue, Shengchao,et al."Sub-arc mantle heterogeneity in oxygen isotopes: evidence from Permian mafic-ultramafic intrusions in the Central Asian Orogenic Belt".CONTRIBUTIONS TO MINERALOGY AND PETROLOGY 173.11(2018):13.
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