IGGCAS OpenIR  > 矿产资源研究院重点实验室
Subduction initiation-induced rapid emplacement of garnet-bearing peridotites at a nascent forearc: Petrological and Os-Li isotopic evidence from the Purang ophiolite, Tibet
Gong, Xiao-Han1; Xu, Ji-Feng2; Shi, Ren-Deng3,4; Su, Ben-Xun5; Huang, Qi-Shuai3; Huang, Xiao-Xiao6
2022-03-01
Source PublicationGEOLOGICAL SOCIETY OF AMERICA BULLETIN
ISSN0016-7606
Volume134Issue:3-4Pages:722-738
AbstractGarnet-bearing peridotites commonly occur in the deeper parts of mature or thickened oceanic lithosphere, and are rarely exhumed and emplaced onto the seafloor. The Purang ophiolitic peridotites in south Tibet contain rare symplectite pseudomorphs after garnet, offering a unique window into the still poorly understood evolution of the deep oceanic lithosphere. Here, integrated petrologic and Os-Li isotopic data are used to constrain the evolution and dynamics of emplacement for these garnet peridotite protoliths. The Purang peridotites show wide variations of chemical compositions (spinel Cr#: 0.2-0.8) and Os model ages (up to 2.0 Ga), thus representing a piece of heterogeneous oceanic mantle lithosphere. Dunite channels show two distinctive groups of Cr# of spinels and Os-isotope compositions, with the low-to medium-Cr# (0.2-0.6) and high-Cr# (0.7-0.8) dunites reflecting the reaction of host lherzolites/harzburgites with percolating mid-ocean ridge basalt-like and boninitic melts, respectively. This confirms recent subduction initiation-related melt percolation in the Purang peridotites. Coexisting olivines and pyroxenes in the peridotites show systematic Li elemental and isotopic disequilibrium, suggesting fast cooling of the peridotites to Li closure temperature shortly after the melt percolations, likely during exhumation of the peridotites onto the seafloor. This supports a close link between subduction initiation and tectonic emplacement of the Purang peridotites. Combined with other geological evidence, we suggest the Purang peridotites may originate from the deep part of old, thick oceanic lithosphere of the NeoTethys. This thick oceanic lithosphere was progressively weakened and thinned likely during widespread plume-lithosphere interaction, triggering the transformation of garnet peridotite protoliths to spinel peridotites. Subsequently, initiation of a new subduction zone along the lithospheric weakness caused rapid ascent and emplacement of the Purang peridotites at a nascent forearc.
DOI10.1130/B35960.1
Funding OrganizationNational Key Research and Development Project of China ; National Key Research and Development Project of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; Second Tibetan Plateau Scientific Expedition and Research Program ; Second Tibetan Plateau Scientific Expedition and Research Program ; Ministry of Science and Technology, China ; Ministry of Science and Technology, China ; National Key Research and Development Project of China ; National Key Research and Development Project of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; Second Tibetan Plateau Scientific Expedition and Research Program ; Second Tibetan Plateau Scientific Expedition and Research Program ; Ministry of Science and Technology, China ; Ministry of Science and Technology, China ; National Key Research and Development Project of China ; National Key Research and Development Project of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; Second Tibetan Plateau Scientific Expedition and Research Program ; Second Tibetan Plateau Scientific Expedition and Research Program ; Ministry of Science and Technology, China ; Ministry of Science and Technology, China ; National Key Research and Development Project of China ; National Key Research and Development Project of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; Second Tibetan Plateau Scientific Expedition and Research Program ; Second Tibetan Plateau Scientific Expedition and Research Program ; Ministry of Science and Technology, China ; Ministry of Science and Technology, China
WOS KeywordIZU-BONIN-MARIANA ; YARLUNG-ZANGBO SUTURE ; MELT-ROCK INTERACTION ; PLASMA-MASS SPECTROMETRY ; SUPRA-SUBDUCTION ; OCEANIC LITHOSPHERE ; MANTLE XENOLITHS ; SOUTHERN TIBET ; LUOBUSA OPHIOLITE ; XIGAZE OPHIOLITE
Language英语
Funding ProjectNational Key Research and Development Project of China[2020YFA0714800] ; National Natural Science Foundation of China[41802046] ; Second Tibetan Plateau Scientific Expedition and Research Program[STEP 2019QZKK0801] ; Ministry of Science and Technology, China[BP0719021]
Funding OrganizationNational Key Research and Development Project of China ; National Key Research and Development Project of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; Second Tibetan Plateau Scientific Expedition and Research Program ; Second Tibetan Plateau Scientific Expedition and Research Program ; Ministry of Science and Technology, China ; Ministry of Science and Technology, China ; National Key Research and Development Project of China ; National Key Research and Development Project of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; Second Tibetan Plateau Scientific Expedition and Research Program ; Second Tibetan Plateau Scientific Expedition and Research Program ; Ministry of Science and Technology, China ; Ministry of Science and Technology, China ; National Key Research and Development Project of China ; National Key Research and Development Project of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; Second Tibetan Plateau Scientific Expedition and Research Program ; Second Tibetan Plateau Scientific Expedition and Research Program ; Ministry of Science and Technology, China ; Ministry of Science and Technology, China ; National Key Research and Development Project of China ; National Key Research and Development Project of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; Second Tibetan Plateau Scientific Expedition and Research Program ; Second Tibetan Plateau Scientific Expedition and Research Program ; Ministry of Science and Technology, China ; Ministry of Science and Technology, China
WOS Research AreaGeology
WOS SubjectGeosciences, Multidisciplinary
WOS IDWOS:000764822800002
PublisherGEOLOGICAL SOC AMER, INC
Citation statistics
Document Type期刊论文
Identifierhttp://ir.iggcas.ac.cn/handle/132A11/105006
Collection矿产资源研究院重点实验室
Corresponding AuthorXu, Ji-Feng; Shi, Ren-Deng
Affiliation1.China Univ Geosci, Sch Ocean Sci, Beijing 100083, Peoples R China
2.China Univ Geosci, State Key Lab Geol Proc & Mineral Resources, Beijing, Peoples R China
3.Chinese Acad Sci, Inst Tibetan Plateau Res, Key Lab Continental Collis & Plateau Uplift, Beijing 100101, Peoples R China
4.Chinese Acad Sci, Ctr Excellence Tibetan Plateau Earth Sci, Beijing 100101, Peoples R China
5.Chinese Acad Sci, Inst Geol & Geophys, Key Lab Mineral Resources, Beijing 100029, Peoples R China
6.North China Univ Water Resources & Elect Power, Coll Geosci & Engn, Zhengzhou, Peoples R China
Recommended Citation
GB/T 7714
Gong, Xiao-Han,Xu, Ji-Feng,Shi, Ren-Deng,et al. Subduction initiation-induced rapid emplacement of garnet-bearing peridotites at a nascent forearc: Petrological and Os-Li isotopic evidence from the Purang ophiolite, Tibet[J]. GEOLOGICAL SOCIETY OF AMERICA BULLETIN,2022,134(3-4):722-738.
APA Gong, Xiao-Han,Xu, Ji-Feng,Shi, Ren-Deng,Su, Ben-Xun,Huang, Qi-Shuai,&Huang, Xiao-Xiao.(2022).Subduction initiation-induced rapid emplacement of garnet-bearing peridotites at a nascent forearc: Petrological and Os-Li isotopic evidence from the Purang ophiolite, Tibet.GEOLOGICAL SOCIETY OF AMERICA BULLETIN,134(3-4),722-738.
MLA Gong, Xiao-Han,et al."Subduction initiation-induced rapid emplacement of garnet-bearing peridotites at a nascent forearc: Petrological and Os-Li isotopic evidence from the Purang ophiolite, Tibet".GEOLOGICAL SOCIETY OF AMERICA BULLETIN 134.3-4(2022):722-738.
Files in This Item:
There are no files associated with this item.
Related Services
Recommend this item
Bookmark
Usage statistics
Export to Endnote
Google Scholar
Similar articles in Google Scholar
[Gong, Xiao-Han]'s Articles
[Xu, Ji-Feng]'s Articles
[Shi, Ren-Deng]'s Articles
Baidu academic
Similar articles in Baidu academic
[Gong, Xiao-Han]'s Articles
[Xu, Ji-Feng]'s Articles
[Shi, Ren-Deng]'s Articles
Bing Scholar
Similar articles in Bing Scholar
[Gong, Xiao-Han]'s Articles
[Xu, Ji-Feng]'s Articles
[Shi, Ren-Deng]'s Articles
Terms of Use
No data!
Social Bookmark/Share
Add to CiteULike Add to Connotea Add to Del.icio.us Add to Digg Add to Reddit Add to Technorati
All comments (0)
No comment.
 

Items in the repository are protected by copyright, with all rights reserved, unless otherwise indicated.