Evidence for pre-Cretaceous history and partial Neogene (19–9Ma) reequilibration in the Karakorum (NW Himalayan Syntaxis) from 40Ar–39Ar amphibole dating

Rolland, Yann; Villa, Igor M.; Guillot, Stéphane; Mahéo, Gweltaz; Pêcher, Arnaud

doi:10.1016/j.jseaes.2005.04.008

Cited by 19 publications

(12 citation statements)

References 56 publications

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“…Tangtse granite exhibits zoned zircons, with inherited core U-Pb ages of 106 Ma (Searle et al, 1999), overgrown by magmatic zircon with ages of 18 Ma. The inherited zircon age of the Tangse granite is within the range of the paleontological and radiometric age of Shyok Suture Zone formations (Aptian-Albian; Rolland et al, 2000Rolland et al, , 2006b, which is in agreement with the Shyok volcanics being a source for the Tangtse Granite. In contrast, the Baltoro granite zircon shows Precambrian inheritance (Parrish and Tirrul, 1989), and is therefore unlikely correlated with the Tangtse Granite.…”

Section: Exhumation Of the Pangong Massifsupporting

confidence: 77%

Syn-kinematic emplacement of the Pangong metamorphic and magmatic complex along the Karakorum Fault (N Ladakh)

Rolland

Mahéo

Pêcher

et al. 2009

Journal of Asian Earth Sciences

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Section: Exhumation Of the Pangong Massifsupporting

confidence: 77%

Syn-kinematic emplacement of the Pangong metamorphic and magmatic complex along the Karakorum Fault (N Ladakh)

Rolland

Mahéo

Pêcher

et al. 2009

Journal of Asian Earth Sciences

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“…10c, d) and EMP analyses show higher Ca/K ratios in the rim (actinolite) v. the in the (hornblende) core of minerals. Therefore, it is likely that the amphibole rim contributes more to the low temperature steps, while the core contributes more to the high temperature steps, as featured in Villa et al (2000) and Rolland et al (2006). Such process of amphibole recrystallization may explain the large range in obtained ages within the same sample.…”

Section: Ree Geochemistrymentioning

confidence: 99%

The Armenian Ophiolite: insights for Jurassic back-arc formation, Lower Cretaceous hot spot magmatism and Upper Cretaceous obduction over the South Armenian Block

Rolland

Galoyan

Sosson

et al. 2010

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Similar geological, petrological, geochemical and age features are found in various Armenian ophiolitic massifs (Sevan, Stepanavan and Vedi). These data argue for the presence of a single large ophiolite unit obducted on the South Armenian Block (SAB). Lherzolite Ophiolite type rock assemblages evidence a Lower–Middle Jurassic slow-spreading rate. The lavas and gabbros have a hybrid geochemical composition intermediate between arc and Mid Ocean Ridge Basalt (MORB) signatures which suggest they were probably formed in a back-arc basin. This oceanic sequence is overlain by pillowed alkaline lavas emplaced in marine conditions. Their geochemical composition is similar to plateau-lavas. Finally, this thickened oceanic crust is overlain by Upper Cretaceous calc-alkaline lavas likely formed in a supra-subduction zone environment. The age of the ophiolite is constrained by 40Ar/39Ar dating experiments provided a magmatic crystallization age of 178.7±2.6 Ma, and further evidence of greenschist facies crystallization during hydrothermal alteration until c. 155 Ma. Thus, top-to-the-south obduction likely initiated along the margin of the back-arc domain, directly south of the Vedi oceanic crust, and was transported as a whole on the SAB in the Coniacian times (88–87 Ma). Final closure of the basin is Late Cretaceous in age (73–71 Ma) as dated by metamorphic rocks

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“…By ~24 Ma, doming occurs in the western Himalayan syntaxis and its adjacent area, involving the Indian crust and the Karakorum (Asian) margin (Rolland et al, 2001(Rolland et al, , 2006a(Rolland et al, , 2006b). In the core of domes, some granulites are found which have ages in the range of ~20- Ar amphibole dating by Rolland et al (2006b).…”

Section: Accepted M Manuscriptmentioning

confidence: 99%

“…In the core of domes, some granulites are found which have ages in the range of ~20- Ar amphibole dating by Rolland et al (2006b). The phase of metamorphism may have initiated as early as 25 Ma in the Baltoro area (Rolland et al, 2001).…”

Section: Accepted M Manuscriptmentioning

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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Evidence for pre-Cretaceous history and partial Neogene (19–9Ma) reequilibration in the Karakorum (NW Himalayan Syntaxis) from 40Ar–39Ar amphibole dating

Cited by 19 publications

References 56 publications

Syn-kinematic emplacement of the Pangong metamorphic and magmatic complex along the Karakorum Fault (N Ladakh)

Syn-kinematic emplacement of the Pangong metamorphic and magmatic complex along the Karakorum Fault (N Ladakh)

The Armenian Ophiolite: insights for Jurassic back-arc formation, Lower Cretaceous hot spot magmatism and Upper Cretaceous obduction over the South Armenian Block

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

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