Petrological and geochemical evidence for the origin of the Yarlung Zangbo ophiolites, southern Tibet

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

doi:10.1016/j.chemgeo.2004.10.004

Cited by 132 publications

(57 citation statements)

References 41 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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“…Indeed, many residues have ratios of light to heavy REE that are too high to be explained in term of residue of equilibrium partial melting ( [Prinzhofer and Allegre, 1985] and [Nicolas, 1989]). U-shaped REE patterns are not only observed in the New Caledonia ophiolite, but also in parts of the Othris ophiolite (Barth et al, 2008), the Yarlung Zangbo ophiolite (Dubois-Cote et al, 2005), and the Trinity ophiolite (Gruau et al, 1998). At least three distinct mechanisms have been proposed to account for U-shaped patterns; (i) sequential disequilibrium melting (Prinzhofer and Allegre, 1985), (ii) mantle metasomatism (e.g.…”

Section: U-shaped Pattern In Harzburgitesmentioning

confidence: 99%

Multiple melting stages and refertilization as indicators for ridge to subduction formation: The New Caledonia ophiolite

Ulrich

Picard

Guillot

et al. 2010

Lithos

125

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The origin of the New Caledonia ophiolite (South West Pacific), one of the largest in the world, is controversial. This nappe of ultramafic rocks (300 km long, 50 km wide and 2 km thick) is thrust upon a smaller nappe (Poya terrane) composed of basalts from mid-ocean ridges (MORB), back arc basins (BABB) and ocean islands (OIB). This nappe was tectonically accreted from the subducting plate prior and during the obduction of the ultramafic nappe.The bulk of the ophiolite is composed of highly depleted harzburgites (± dunites) with characteristic U-shaped bulk-rock rare-earth element (REE) patterns that are attributed to their formation in a forearc environment. In contrast, the origin of spoon-shaped REE patterns of lherzolites in the northernmost klippes was unclear. Our new major element and REE data on whole rocks, spinel and clinopyroxene establish the abyssal affinity of these lherzolites. Significant LREE enrichment in the lherzolites is best explained by partial melting in a spreading ridge, followed by near in-situ refertilization from deeper mantle melts. Using equilibrium melting equations, we show that melts extracted from these lherzolites are compositionally similar to the MORB of the Poya terrane. This is used to infer that the ultramafic nappe and the mafic Poya terrane represent oceanic lithosphere of a single marginal basin that formed during the late Cretaceous. In contrast, our spinel data highlights the strong forearc affinities of the most depleted harzburgites whose compositions are best modeled by hydrous melting of a source that had previously experienced depletion in a spreading ridge. The New Caledonian boninites probably formed during this second stage of partial melting.The two melting events in the New Caledonia ophiolite record the rapid transition from oceanic accretion to convergence in the South Loyalty Basin during the Late Paleocene, with initiation of a new subduction zone at or near the ridge axis.

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“…These formations could not be traced to the east of Ladakh sector in Lhasa and southern Tibet region and remain a peculiarity of the northwestern Himalaya. However, tectonic models proposing two subduction zones in general assume two sutures along the entire south Asian boundary (Brookfield and Reynolds, 1981;Rai, 1983;Reynolds et al, 1983;Coward and Butler, 1985;Petterson and Windley, 1985;Srimal, 1986;Sharma, 1987;Treloar et al, 1989;Searle et al, 1997;Weinberg and Dunlap, 2000;Dunlap and Wysoczanski, 2002;Robertson and Collins, 2002;Dubois-Cote et al, 2005;Dupuis et al, 2005). This has resulted in various attempts of correlating older sutures present in Lhasa-Tibet block with the Shyok suture (Dunlap and Wysoczanski, 2002;Lacassin et al, 2004).…”

Section: Introductionmentioning

confidence: 99%

40Ar–39Ar dating of volcanic rocks of the Shyok suture zone in north–west trans-Himalaya: Implications for the post-collision evolution of the Shyok suture zone

Bhutani

Pande

Venkatesan

2009

Journal of Asian Earth Sciences

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Petrological and geochemical evidence for the origin of the Yarlung Zangbo ophiolites, southern Tibet

Cited by 132 publications

References 41 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

Multiple melting stages and refertilization as indicators for ridge to subduction formation: The New Caledonia ophiolite

40Ar–39Ar dating of volcanic rocks of the Shyok suture zone in north–west trans-Himalaya: Implications for the post-collision evolution of the Shyok suture zone

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