Coesite in Himalayan eclogite and implications for models of India-Asia collision

O’Brien, Patrick J.; Zotov, Ν.; Law, Richard D.; Khan, Muhammad Asif; Jan, M.Q.

doi:10.1130/0091-7613(2001)029<0435:ciheai>2.0.co;2

Cited by 257 publications

(169 citation statements)

References 17 publications

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“…and Kaghan areas, have demonstrated that the continental crust of the entire northwestern part of the Indian plate was subducted beneath the Kohistan-Ladakh arc to a minimum depth of 90 km (O'Brien et al, 2001;Mukherjee and Sachan, 2003). Chronologic investigations show that the UHP metamorphism occurred in the Early Eocene (de Sigoyer et al, 2000;Kaneko et al, 2003;Leech et al, 2005;Parrish et al, 2006).…”

Section: Introductionmentioning

confidence: 99%

Timing of granulite-facies metamorphism in the eastern Himalayan syntaxis and its tectonic implications

Xu¹,

Zhang²,

Parrish³

et al. 2010

Tectonophysics

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This is a PDF file of an unedited manuscript that has been accepted for publication. As a service to our customers we are providing this early version of the manuscript. The manuscript will undergo copyediting, typesetting, and review of the resulting proof before it is published in its final form. Please note that during the production process errors may be discovered which could affect the content, and all legal disclaimers that apply to the journal pertain. constrainted to be between 490 and ~600 Ma. Our data suggest that the granulite terrane in the eastern Himalayan syntaxis has an affinity with the Greater Himalayan Series. The HP granulite-facies metamorphic events in the eastern Himalayan syntaxis are distinct from ultrahigh pressure (UHP) metamorphic events in the western Himalayan syntaxis in both age and depth of burial. However, the metamorphic history of the eastern and western Himalayan syntaxises becomes similar after ~24 Ma. The Namche Barwa granulites appear to result from the underthrusting of the Indian plate lithologies beneath the Lhasa block during progressive collisional processes, followed by extrusion and/or exhumation that result from a slab breakoff of the Indian plate during the Miocene. A C C E P T E D M A N U S C R I P T ACCEPTED MANUSCRIPT

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Section: Introductionmentioning

confidence: 99%

Timing of granulite-facies metamorphism in the eastern Himalayan syntaxis and its tectonic implications

Xu¹,

Zhang²,

Parrish³

et al. 2010

Tectonophysics

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“…P-wave tomography identifies high-velocity zones beneath the Himalayan collision zone that can be traced to >1000 km deep in the mantle; these must be stilldescending slabs of subducted Tethys oceanic and Indian continental lithosphere (Van der Voo et al 1999). We also have direct evidence that at least some Indian continental crust is deeply subducted, because ultra-high pressure (UHP) metamorphic terranes -which contain metamorphic coesite, diamond, unusual Si-rich garnets, and/or K-bearing pyroxenes -are known from near Nanga Parbat and Tso Morai in the Himalayas (O'Brien et al 2001;Kaneko et al 2003;Leech et al 2005). UHP minerals demonstrate that these continental fragments descended to at least 90-140 km depth (Ernst 2006).…”

Section: Continent Subductionmentioning

confidence: 99%

Yin and yang of continental crust creation and destruction by plate tectonic processes

Stern

Scholl

2010

International Geology Review

202

107

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Earth's continental crust today is both created and destroyed by plate tectonic processes, a balance that is encapsulated by the traditional Chinese concept of yin-yang, whereby dualities act in concert as well as in opposition. Yin-yang conceptualizations of crustal growth and destruction are mostly related to plate tectonics; both occur mostly at subduction zones, by arc magmatic creation and by subduction removal. Crust is also created and destroyed by processes unrelated to plate tectonics, including losses by lower crust foundering and additions at hotspots. At present, creation and destruction of continental crust is either in balance (∼3.2 km 3 /year, or 3.2 AU) or more crust is being destroyed than created; the uncertainty comes from unknown deep losses of continental crust at collision zones and due to lower crustal foundering. The yinyang creation-destruction balance changes over a supercontinent cycle, with crustal growth being greatest during supercontinent break-up due to high magmatic flux at new arcs and crustal destruction being greatest during supercontinent amalgamation due to subduction of continental material and increased sediment flux due to orogenic uplift. These conclusions challenge the widely held view that continental crust volume has increased over time due to plate tectonic activity; it is just as likely that this volume has decreased.

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“…1), consists of Proterozoic orthogneiss and overlying metasedimentary rocks including Neoproterozoic-Lower Paleozoic biotite metagraywacke with intercalated garnet and/or kyanite metapelites (Treloar et al, 2003) and Upper Paleozoic-Mesozoic calc-paragneiss and schist with intercalated Permian amphibolite (Spencer et al, 1995). Coesite-bearing eclogite experienced peak conditions of ~3.0 GPa and 770 ºC (O'Brien et al, 2001) whereas coesite-free rocks record peak conditions of ~2.4 GPa and 610 ºC (Lombardo et al, 2000). Retrogression took place under blueschist-amphibolite and later greenschist-facies conditions (Guillot et al, 2008).…”

Section: Himalayamentioning

confidence: 99%

High-pressure Tethyan Himalaya rocks along the India-Asia suture zone in southern Tibet

Laskowski¹,

Kapp²,

Vervoort³

et al. 2016

Lithosphere

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This study documents an early Cenozoic continental high-pressure (HP) metamorphic complex along the Yarlung (India-Asia) suture zone in southern Tibet. The complex is exposed in the Lopu Range, located ~600 km west of Lhasa city. HP rocks in the core of the complex have Indian passive margin (Tethyan Himalaya Sequence) protoliths and are exposed in the footwall of a top-to-the-north, normal-sense shear zone.

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Coesite in Himalayan eclogite and implications for models of India-Asia collision

Cited by 257 publications

References 17 publications

Timing of granulite-facies metamorphism in the eastern Himalayan syntaxis and its tectonic implications

Timing of granulite-facies metamorphism in the eastern Himalayan syntaxis and its tectonic implications

Yin and yang of continental crust creation and destruction by plate tectonic processes

High-pressure Tethyan Himalaya rocks along the India-Asia suture zone in southern Tibet

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