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Radiolarian-based study on the fabric and the formation process of the Early Cretaceous melange near Zhongba, Yarlung-Tsangpo Suture Zone, southern Tibet
Li, Xin (李鑫)1,2; Matsuoka, Atsushi3; Li, Yalin4; Wei, Yushuai4; Wang, Chengshan4
2019
Source PublicationISLAND ARC
ISSN1038-4871
Volume28Issue:1Pages:21
Abstract

The Yarlung-Tsangpo Suture Zone (YTSZ), as the southernmost and youngest among the sutures that subdivides the Tibetan Plateau into several east-west trending blocks, marks where the Neo-Tethys was consumed as the Indian continent moved northward and collided against the Eurasian continent. Melanges in the YTSZ represent the remnants of the oceanic plate through subduction and collision. Melanges are characterized by a highly sheared volcanoclastic or siliceous mudstone matrix including blocks of chert, claystone, and basalt. Detailed radiolarian analyses are conducted on the melange near Zhongba County. Macroscopic, mesoscopic, and microscopic observations are combined in order to elucidate the relationships among age, lithology, and structure of blocks in the melange. Reconstructed ocean plate stratigraphy includes Lower Jurassic limestone within the chert sequence accumulated at a depth near the CCD (Unit 2), Upper Jurassic thin-bedded chert interbedded with claystone deposited in the wide ocean basin (Unit 3), and Lower Cretaceous chert with siliceous mudstone (Units 4 and 5), representing the middle parts of ocean plate stratigraphy. The results highlight the fabric of brecciated chert on mesoscopic scale, which is thought to be due to localized overpressure. The formation of mesoscopic and microscopic block-in-matrix fabrics in the melange is proposed for the chert and siliceous mudstone bearing different extents of consolidation and competence during the progressive deformation of accreted sediments at shallow-level subduction.

KeywordBreccia Melange Ocean Plate Stratigraphy Radiolarian Assemblage Sem Observation
DOI10.1111/iar.12282
Language英语
WOS KeywordLate Jurassic Radiolarians ; Accretionary Prism ; Xialu-chert ; Evolution ; Ophiolite ; Fauna ; Deformation ; Assemblages ; Terrane ; History
Funding ProjectChinese Academy of Sciences (CAS) Pioneer Hundred Talents Program ; Project of the State Key Laboratory of Palaeobiology and Stratigraphy[20182108] ; Japan Society for the Promotion of Science KAKENHI[15K05329] ; Japan Society for the Promotion of Science KAKENHI[15H02142] ; National Natural Science Foundation of China[41572188] ; Project of China Geological Survey[1212011086037] ; Project of China Geological Survey[1212011121229]
WOS Research AreaGeology
WOS SubjectGeosciences, Multidisciplinary
WOS IDWOS:000454747400005
Funding OrganizationChinese Academy of Sciences (CAS) Pioneer Hundred Talents Program ; Project of the State Key Laboratory of Palaeobiology and Stratigraphy ; Japan Society for the Promotion of Science KAKENHI ; National Natural Science Foundation of China ; Project of China Geological Survey
PublisherWILEY
Citation statistics
Document Type期刊论文
Identifierhttp://ir.nigpas.ac.cn/handle/332004/16137
Collection中国科学院南京地质古生物研究所
Corresponding AuthorLi, Xin (李鑫)
Affiliation1.Chinese Acad Sci, Nanjing Inst Geol & Palaeontol, State Key Lab Palaeobiol & Stratig, 39 East Beijing Rd, Nanjing 210008, Jiangsu, Peoples R China
2.Chinese Acad Sci, Ctr Excellence Life & Paleoenvironm, 39 East Beijing Rd, Nanjing 210008, Jiangsu, Peoples R China
3.Niigata Univ, Dept Geol, Fac Sci, Niigata 9502181, Japan
4.China Univ Geosci, Dept Earth Sci & Resources, Beijing 100083, Peoples R China
First Author AffilicationNanjing Institute of Geology and Palaeonotology,CAS
Corresponding Author AffilicationNanjing Institute of Geology and Palaeonotology,CAS
Recommended Citation
GB/T 7714
Li, Xin ,Matsuoka, Atsushi,Li, Yalin,et al. Radiolarian-based study on the fabric and the formation process of the Early Cretaceous melange near Zhongba, Yarlung-Tsangpo Suture Zone, southern Tibet[J]. ISLAND ARC,2019,28(1):21.
APA Li, Xin ,Matsuoka, Atsushi,Li, Yalin,Wei, Yushuai,&Wang, Chengshan.(2019).Radiolarian-based study on the fabric and the formation process of the Early Cretaceous melange near Zhongba, Yarlung-Tsangpo Suture Zone, southern Tibet.ISLAND ARC,28(1),21.
MLA Li, Xin ,et al."Radiolarian-based study on the fabric and the formation process of the Early Cretaceous melange near Zhongba, Yarlung-Tsangpo Suture Zone, southern Tibet".ISLAND ARC 28.1(2019):21.
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