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Distinctive melt activity and chromite mineralization in Luobusa and Purang ophiolites, southern Tibet: constraints from trace element compositions of chromite and olivine
Su, BX (Su, Benxun)1,2,3; Zhou, MF (Zhou, Meifu)4; Jing, JJ (Jing, Jiejun)1,2,3; Robinson, PT (Robinson, Paul T.)1,4; Chen, C (Chen, Chen)1,2,3; Xiao, Y (Xiao, Yan)3,5; Liu, X (Liu, Xia)1,2,3; Shi, RD (Shi, Rendeng)6; Lenaz, D (Lenaz, Davide)7; Hu, Y (Hu, Yan)8
Source PublicationSCIENCE BULLETIN
2019
Volume64Issue:2Pages:108-121
DOI10.1016/j.scib.2018.12.018
Abstract

To investigate the factors controlling the mineralization in ophiolites we systematically compared the petrology and mineral compositions of the harzburgites/lherzolites, dunites and chromitites in the Luobusa and Purang ophiolites. Generally, the petrological features and trace element compositions of chromite and olivine in peridotite and chromitite are distinctly different between the two ophiolites. In Luobusa, boninitic melts are inferred to have interacted with the harzburgites and modified the distributions of some trace elements (e.g., Ni, Mn and V) in chromite and olivine. The subsequently formed dunites and chromitites experienced significant elemental exchange. In contrast, the Purang ophiolite contains a wider range of chromitite compositions and records diverse melt activities, such as the growth of relatively abundant secondary clinopyroxene. The metasomatic melts were enriched in Al and depleted in Si, Na and highly incompatible trace elements (e.g., Nb, Zr). Such melts resemble MORB-like melts proposed in the literature but are assumed to be more hydrous than typical MORB because of presence of hydrous minerals. The parental magmas of the Purang dunites and intermediate chromitites are inferred to be compositionally intermediate between boninitic and MORB-like melts. In addition, the more refractory nature of the Luobusa harzburgites facilitated a high Cr concentration gradient with the interacting melts, making it easier to increase Cr in the melts. Crystallization of clinopyroxene and amphibole in the Purang ophiolite accommodated significant amounts of Cr and water, respectively, and negatively affected Cr concentration and chromite crystallization. The concentration of chromite to form chromitites requires the presence of focused melt channels. (C) 2018 Science China Press. Published by Elsevier B.V. and Science China Press. All rights reserved.

Subject AreaScience & Technology
WOS IDWOS:000460872100007
Language英语
Indexed BySCI
KeywordZangbo Suture Zone Pozanti-karsanti Ophiolite Izu-bonin-mariana Podiform Chromitites Oceanic Lithosphere Upper-mantle Transition Zone Ortho-pyroxene High-al High-cr
WOS Research AreaScience & Technology - Other Topics
WOS SubjectMultidisciplinary Sciences
Cooperation Status国际
ISSN2095-9273
Department大陆碰撞与高原隆升
URL查看原文
PublisherELSEVIER SCIENCE BV
SubtypeArticle
Citation statistics
Cited Times:25[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Identifierhttp://ir.itpcas.ac.cn/handle/131C11/9425
Collection图书馆
Corresponding AuthorSu, BX (Su, Benxun)
Affiliation1.Chinese Acad Sci, Key Lab Mineral Resources, Inst Geol & Geophys, Beijing 100029, Peoples R China;
2.Univ Chinese Acad Sci, Beijing 100049, Peoples R China;
3.Chinese Acad Sci, Inst Earth Sci, Beijing 100029, Peoples R China;
4.[Zhou, Meifu; Robinson, Paul T.] Univ Hong Kong, Dept Earth Sci, Hong Kong, Peoples R China;
5.Chinese Acad Sci, State Key Lab Lithospher Evolut, Inst Geol & Geophys, Beijing 100029, Peoples R China;
6.Chinese Acad Sci, Key Lab Continental Collis & Plateau Uplift, Inst Tibetan Plateau Res, Beijing 100101, Peoples R China;
7.Univ Trieste, Dept Math & Geosci, Via Weiss 8, I-34127 Trieste, Italy;
8.Univ Washington, Dept Earth & Space Sci, Seattle, WA 98195 USA.
Recommended Citation
GB/T 7714
Su, BX ,Zhou, MF ,Jing, JJ ,et al. Distinctive melt activity and chromite mineralization in Luobusa and Purang ophiolites, southern Tibet: constraints from trace element compositions of chromite and olivine[J]. SCIENCE BULLETIN,2019,64(2):108-121.
APA Su, BX .,Zhou, MF .,Jing, JJ .,Robinson, PT .,Chen, C .,...&Hu, Y .(2019).Distinctive melt activity and chromite mineralization in Luobusa and Purang ophiolites, southern Tibet: constraints from trace element compositions of chromite and olivine.SCIENCE BULLETIN,64(2),108-121.
MLA Su, BX ,et al."Distinctive melt activity and chromite mineralization in Luobusa and Purang ophiolites, southern Tibet: constraints from trace element compositions of chromite and olivine".SCIENCE BULLETIN 64.2(2019):108-121.
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