Petrology and geochemistry of mafic rocks from mélange and flysch units adjacent to the Yarlung Zangbo Suture Zone, southern Tibet

Dupuis, C; Hébert, Réjean; Dubois-Côté, V.; Wang, C.S.; Li, Y.L.; Li, Z.J.

doi:10.1016/j.chemgeo.2004.10.005

Cited by 74 publications

(60 citation statements)

References 71 publications

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“…However, improved age constraints from radiolarian biostratigraphy and geochronology indicate that it formed largely in the late Middle to mid-Late Jurassic. The occurrence of other intraoceanic supra subduction zone rocks along the YTSZ, such as the midCretaceous ophiolites of the Dazhuqu terrane (Aitchison et al 2000(Aitchison et al , 2004Ziabrev et al 2003b;Dubois-Cote et al 2005;Dupuis et al 2005aDupuis et al , 2005b, and evidence from tomographic imaging for an extensive subducted slab beneath India ( Van der Voo et al 1999) suggest the existence of a long-lived, intraoceanic subduction system within Tethys.…”

Section: Discussionmentioning

confidence: 99%

Shoshonites in Southern Tibet Record Late Jurassic Rifting of a Tethyan Intraoceanic Island Arc

Aitchison¹,

McDermid²,

Ali³

et al. 2007

The Journal of Geology

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JSTOR is a not-for-profit service that helps scholars, researchers, and students discover, use, and build upon a wide range of content in a trusted digital archive. We use information technology and tools to increase productivity and facilitate new forms of scholarship. For more information about JSTOR, please contact support@jstor.org. A B S T R A C TDetailed field mapping combined with a petrologic and geochemical investigation of the Zedong terrane within the Yarlung Tsangpo suture zone provides insights to the evolution of now mostly subducted portions of Tethys during the Late Jurassic. The terrane is dominated by volcanic rocks of shoshonitic affinity, which were erupted in a submarine oceanic island arc setting. The volcanic island arc was built on a basement of oceanic crust, and the shoshonites locally overlie a thin section of pillowed island arc tholeiites and red ribbon-bedded radiolarian cherts. Geochemistry of the shoshonites suggests that their development occurred in a setting analogous to that of Late Miocene to Early Pliocene Fiji and was associated with an arc rifting. We speculate that this event may have been a far-field response to developments associated with Gondwana breakup.

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Section: Discussionmentioning

confidence: 99%

Shoshonites in Southern Tibet Record Late Jurassic Rifting of a Tethyan Intraoceanic Island Arc

Aitchison¹,

McDermid²,

Ali³

et al. 2007

The Journal of Geology

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“…Finally, the Bainang terrane is separated from the Indian terrane to the south by a major thrust fault (Aitchison et al, 2000). Dupuis et al (2005) provide geochemical data for the mafic flysch rocks hosted by the Indian terrane in this area.…”

Section: Comparison Of Ree Geochemistry With Local Source Rocksmentioning

confidence: 99%

Loess sedimentation in Tibet: provenance, processes, and link with Quaternary glaciations

Sun

Muhs

et al. 2007

Quaternary Science Reviews

159

104

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Well-preserved loess deposits are found on the foothills of mountains along the middle reaches of the Yarlung Zangbo River in southern Tibet. Optically stimulated luminescence (OSL) dating is used to determine loess ages by applying the single-aliquot regeneration technique. Geochemical, mineralogical, and granulometric measurements were carried out to allow a comparison between loess from Tibet and the Chinese Loess Plateau. Our results demonstrate that (i) the loess deposits have a basal age of 13-11 ka, suggesting they accumulated after the last deglaciation, (ii) loess in southern Tibet has a ''glacial'' origin, resulting from eolian sorting of glaciofluvial outwash deposits from braided river channels or alluvial fans by local near-surface winds, and (iii) the present loess in the interior of Tibet has accumulated since the last deglaciation when increased monsoonal circulation provided an increased vegetation cover that was sufficient for trapping eolian silt. The lack of full-glacial loess is either due to minimal vegetation cover or possibly due to the erosion of loess as glaciofluvial outwash during the beginning of each interglacial. Such processes would have been repeated during each glacial-interglacial cycle of the Quaternary. r

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“…And the result represents the age of the sea floor spreading of Tethys, which suggests the presence of mature oceanic basin in this region at about 128 Ma. The ophiolitic mélange south to it indicates that the Tiding ophiolite formed in a back-arc basin or an oceanic island setting [13] . This age is consistent with the formation age of 126±1.5 Ma for the Dgzhuka ophiolite as dated by the SHRIMP zircon U-Pb method for the Dgzhuka quartz diorite [7] .…”

Section: Discussionmentioning

confidence: 99%

SHRIMP zircon U-Pb dating for gabbro from the Tiding ophiolite in Tibet

et al. 2006

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Petrology and geochemistry of mafic rocks from mélange and flysch units adjacent to the Yarlung Zangbo Suture Zone, southern Tibet

Cited by 74 publications

References 71 publications

Shoshonites in Southern Tibet Record Late Jurassic Rifting of a Tethyan Intraoceanic Island Arc

Shoshonites in Southern Tibet Record Late Jurassic Rifting of a Tethyan Intraoceanic Island Arc

Loess sedimentation in Tibet: provenance, processes, and link with Quaternary glaciations

SHRIMP zircon U-Pb dating for gabbro from the Tiding ophiolite in Tibet

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