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Melt Penetration in Oceanic Lithosphere: Li Isotope Records from the Pozanti-Karsanti Ophiolite in Southern Turkey

文献类型：期刊论文

作者Su, Ben-Xun1,2; Chen, Chen1,2; Pang, Kwan-Nang3; Sakyi, Patrick Asamoah4; Uysal, Ibrahim5; Avci, Erdi6; Liu, Xia1,7; Zhang, Peng-Fei8
刊名JOURNAL OF PETROLOGY
出版日期2018
卷号59期号:1页码:191-205
关键词chromite Li isotopes melt penetration olivine ophiolite subduction
ISSN号0022-3530
DOI10.1093/petrology/egy023
文献子类Article
英文摘要Understanding melt penetration in ophiolites is important in revealing the formation and evolution of the oceanic lithosphere, as well as the formation of chromite deposits. We conducted in situ Li isotope analysis of olivine grains from the harzburgite, podiform chromitite and dunite envelope of the mantle sequence, and dunite and wehrlite cumulates from the crustal sequence of the PozantiKarsanti ophiolite. Olivine in the different rocks has variable and distinctive Li concentrations (0.95 to 2.01 ppm) and d 7 Li isotopic compositions (-5.43 to 16.65 &). The olivine in the refractory harzburgite of the Pozanti-Karsanti ophiolite extends from MOR-peridotite-like compositions to lower d 7 Li values and higher Li concentrations, suggesting ingressive Li diffusion via melt penetration. The Li isotopic compositions of the olivine in the dunite envelope and podiform chromitite represent the compositions of their parental melts and thus their sources. The dunite envelope has d 7 Li values beyond MORB and OIB variations and overlaps the arc lava range, suggesting an affinity with arc magmatism. The podiform chromitite, on the other hand, shows wider d 7 Li variation and overall lower values, falling in the ranges of granulite and eclogite. The parental melts of the podiform chromitite might: (1) originate from partial melting of a dehydrated and metamorphosed subducted slab or (2) may initially have had the same isotopic composition as the associated dunite, but later experienced compositional modification by fluids. The Li isotopic compositions of the dunite and wehrlite cumulates fall between the OIB and arc fields, supporting a subduction origin for these ultramafic cumulates and their arc-like parental magmas. The Pozanti-Karsanti ophiolite records various melt penetration agents during its formation and evolution. The melts display progressive compositional variations, mainly between OIB and immature and mature oceanic island arc magmatism, pointing to their correlation with subduction initiation. The distinctive Li isotopic compositions of the Pozanti-Karsanti, Luobusa and Trinity ophiolites suggest that the generation and compositions of penetrating melts in oceanic lithosphere and subsequent formation of chromite deposits are strongly controlled by tectonic setting. Consequently, Li isotope systematics can be used as an indicator of the tectonic setting and mineralization of ophiolites.
WOS关键词PODIFORM CHROMITE DEPOSITS ; PERIDOTITE XENOLITHS ; MANTLE METASOMATISM ; OROGENIC ECLOGITES ; LUOBUSA OPHIOLITE ; LITHIUM ISOTOPES ; ROCK INTERACTION ; BONINITIC MELT ; RIDGE BASALTS ; FRACTIONATION
WOS研究方向Geochemistry & Geophysics
语种英语
WOS记录号WOS:000433240400008
出版者OXFORD UNIV PRESS
资助机构National Natural Science Foundation of China(91755205 ; National Natural Science Foundation of China(91755205 ; State Key Laboratory of Lithospheric Evolution(201701) ; State Key Laboratory of Lithospheric Evolution(201701) ; 41772055) ; 41772055) ; National Natural Science Foundation of China(91755205 ; National Natural Science Foundation of China(91755205 ; State Key Laboratory of Lithospheric Evolution(201701) ; State Key Laboratory of Lithospheric Evolution(201701) ; 41772055) ; 41772055) ; National Natural Science Foundation of China(91755205 ; National Natural Science Foundation of China(91755205 ; State Key Laboratory of Lithospheric Evolution(201701) ; State Key Laboratory of Lithospheric Evolution(201701) ; 41772055) ; 41772055) ; National Natural Science Foundation of China(91755205 ; National Natural Science Foundation of China(91755205 ; State Key Laboratory of Lithospheric Evolution(201701) ; State Key Laboratory of Lithospheric Evolution(201701) ; 41772055) ; 41772055)
源URL[http://ir.iggcas.ac.cn/handle/132A11/88241]  
专题地质与地球物理研究所_中国科学院矿产资源研究重点实验室
通讯作者Su, Ben-Xun
作者单位1.Chinese Acad Sci, Inst Geol & Geophys, Key Lab Mineral Resources, Beijing 100029, Peoples R China
2.Univ Chinese Acad Sci, Beijing 100049, Peoples R China
3.Acad Sinica, Inst Earth Sci, Taipei, Taiwan
4.Univ Ghana, Dept Earth Sci, POB LG 58, Legon, Ghana
5.Karadeniz Tech Univ, Dept Geol Engn, TR-61080 Trabzon, Turkey
6.Istanbul Univ, Dept Geol Engn, TR-34320 Istanbul, Turkey
7.Chendu Univ Technol, Coll Earth Sci, Chengdu 610059, Sichuan, Peoples R China
8.Univ Hong Kong, Dept Earth Sci, Pokfulam Rd, Hong Kong, Hong Kong, Peoples R China
推荐引用方式
GB/T 7714		 Su, Ben-Xun,Chen, Chen,Pang, Kwan-Nang,et al. Melt Penetration in Oceanic Lithosphere: Li Isotope Records from the Pozanti-Karsanti Ophiolite in Southern Turkey[J]. JOURNAL OF PETROLOGY,2018,59(1):191-205.
APA Su, Ben-Xun.,Chen, Chen.,Pang, Kwan-Nang.,Sakyi, Patrick Asamoah.,Uysal, Ibrahim.,...&Zhang, Peng-Fei.(2018).Melt Penetration in Oceanic Lithosphere: Li Isotope Records from the Pozanti-Karsanti Ophiolite in Southern Turkey.JOURNAL OF PETROLOGY,59(1),191-205.
MLA Su, Ben-Xun,et al."Melt Penetration in Oceanic Lithosphere: Li Isotope Records from the Pozanti-Karsanti Ophiolite in Southern Turkey".JOURNAL OF PETROLOGY 59.1(2018):191-205.

入库方式： OAI收割

来源：地质与地球物理研究所

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