Contrasting CW and CCW tectono-metamorphic belts in the eastern Himalayan syntaxis: quantification of P–T–t paths and tectonic interpretation

Tian, Z.; Brown, Michael; Zhang, Z.; Piccoli, Philip M.; Dong, Xin

doi:10.1016/j.gr.2019.08.016

Cited by 15 publications

(12 citation statements)

References 128 publications

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“…While zircon rims in granitic glacial float from the NBM as young as ~1 Ma have been dated, the volumes of such granites and the petrological significance of such dates are unknown ( 59 ). Existing petrochronology of migmatites from the NBM does not show evidence of Pleistocene metamorphism and melting ( 60 – 62 ). Further mapping, geochronology, and quantification of leucogranite volumes in both syntaxes and constraints on the modal abundance of muscovite in the source rocks for these melts ( 15 ) are necessary.…”

Section: Discussionmentioning

confidence: 99%

Section: Onset Of Ultrafast Exhumation: the Role Of Crustal Weakening...mentioning

confidence: 95%

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A modern pulse of ultrafast exhumation and diachronous crustal melting in the Nanga Parbat Massif

et al. 2022

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We combine monazite petrochronology with thermal modeling to evaluate the relative roles of crustal melting, surface denudation, and tectonics in facilitating ultrafast exhumation of the Nanga Parbat Massif in the western Himalayan syntaxis. Our results reveal diachronous melting histories between samples and a pulse of ultrafast exhumation (9 to 13 mm/year) that began ~1 Ma and was preceded by several million years of slower, but still rapid, exhumation (2 to 5 mm/year). Recent studies show that an exhumation pulse of similar timing and magnitude occurred in the eastern Himalayan syntaxis. A synchronous exhumation pulse in both Himalayan syntaxes suggests that neither erosion by rivers and/or glaciers nor a pulse of crustal melting was a primary trigger for accelerated exhumation. Rather, our results, combined with those of recent studies in the eastern syntaxis, imply that larger-scale tectonic processes impose the dominant control on the current tempo of rapid exhumation in the Himalayan syntaxes.

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Section: Discussionmentioning

confidence: 99%

Section: Onset Of Ultrafast Exhumation: the Role Of Crustal Weakening...mentioning

confidence: 95%

A modern pulse of ultrafast exhumation and diachronous crustal melting in the Nanga Parbat Massif

et al. 2022

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“…The upper (northern) unit occurs as a NE‐SW striking belt within the northwestern part of the GHS and includes three tectonic slices that are separated by ductile shear zones or detachment and thrust faults (DF 1 and DF 2 ; Figures 1b and 1c). The upper GHS unit consists of gneiss, schist, amphibolite, marble, calc‐silicate rock and high‐pressure (HP) granulite and experienced an extended period of upper amphibolite‐facies to granulite‐facies metamorphism and partial melting from ∼50 to ∼3 Ma (Booth et al., 2004, 2009; L. Ding et al., 2001; Peng et al., 2018, 2022; Tian et al., 2016, 2020; Z. M. Zhang et al., 2012, 2015; Z. M. Zhang, Ding, Palin, et al., 2022). The lower (southern) GHS unit is composed mainly of migmatitic amphibolite and orthogneiss and underwent upper amphibolite‐facies metamorphic and partial melting.…”

Section: Background and Samplesmentioning

confidence: 99%

Intraoceanic Subduction System Within the Neo‐Tethys: Evidence From Late Cretaceous Arc Magmatic Rocks of the Eastern Himalaya

Zhang,

An,

Palin

et al. 2023

Geochem Geophys Geosyst

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The tectonic evolution of the Neo‐Tethys Ocean remains highly controversial, with several models existing in the community that conflict with each other. Here, we present new geochronologic and geochemical data for orthogneisses and amphibolites from the Greater Himalayan Sequence, eastern Himalayan orogen, which indicate that these rocks have Cenozoic metamorphic ages (∼52–3 Ma), but were derived from Late Cretaceous (∼89 Ma) magmas with arc‐like and depleted mantle geochemical signatures. Considering that northern India was a passive continental margin during the Mesozoic, and the previously reported Late Cretaceous magmatic rocks in the eastern Himalaya formed in a continental rifting setting, we suggest that the studied Late Cretaceous arc‐type magmatic rocks formed in an intraoceanic arc setting within the Neo‐Tethys, and accreted onto the passive margin of the Indian continent prior to the terminal continental collision. When combined with the existence of Late Mesozoic and intraoceanic arc‐type magmatic rocks in the western Himalaya, we suggest that a huge Late Cretaceous subduction system operated within the eastern Neo‐Tethys Ocean. This study supports two subduction zones having been responsible for the consumption and closure of the Neo‐Tethys basin, and a two‐stage collision history between India, Asia, and the intermediate island arc system. Our data therefore provide important constraints on the evolution of the Neo‐Tethys Ocean and India‐Asia collisional orogeny in southern Tibet.

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“…1b; Booth et al, 2004;Dong et al, 2010;Zhang et al, 2010a;Guo et al, 2011Guo et al, , 2012Guo et al, , 2019Guo et al, , 2020Lin et al, 2013;Zhang et al, 2013Zhang et al, , 2015aZhang et al, , 2020. The Nyingchi Complex is composed of amphibolite, migmatite, orthogneiss, paragneiss, schist, marble, and minor granulites (Zhang et al, 2010b(Zhang et al, , 2015aGuo et al, 2012Guo et al, , 2013Tian et al, 2020). The protoliths of the Nyingchi Complex include Paleoproterozoic, Early Paleozoic, Mesozoic magmatic rocks (Guo et al, 2011(Guo et al, , 2013(Guo et al, , 2017Dong et al, 2020a), and Neoproterozoic, Paleozoic-Cenozoic sedimentary rocks.…”

Section: Geological Background and Samplesmentioning

confidence: 99%

“…40 Ma to ca. 10 Ma (Ding et al, 2001;Liu et al, 2007;Booth et al, 2009;Xu et al, 2010;Zhang et al, 2010bZhang et al, , 2015bZhang et al, , 2018Su et al, 2012;Zeng et al, 2012;Liu and Zhang, 2014;Tian et al, 2019Tian et al, , 2020. It is unclear whether the large range in metamorphic ages represents long-lived or multistage HP metamorphism.…”

Section: Introductionmentioning

confidence: 99%

Tracing high-pressure metamorphism in the eastern Himalayan syntaxis using detrital zircon and monazite from modern stream sediments

et al. 2022

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The timing of high-pressure (HP) metamorphism in the eastern Himalayan syntaxis is important for understanding the India-Asia collisional processes, but it remains elusive. To reveal the metamorphic history of the eastern Himalayan syntaxis, we performed a study of geochronology, trace elements, and mineral inclusions of detrital zircon and monazite from modern stream sediments in the eastern Himalayan syntaxis. Detrital zircon comprise magmatic and metamorphic domains with different zoning. Inherited magmatic zircon domains have high Th/U, low (Dy/Yb)N, and retain ages of 1798−360 Ma. Metamorphic zircon domains with low Th/U, high (Dy/Yb)N, and inclusions of garnet, kyanite, and/or clinopyroxene probably formed under HP conditions. They yield age groups of 49−35 Ma, 33−17 Ma, and 12−7 Ma. The low Th/U and low (Dy/Yb)N metamorphic zircon domains probably formed during retrogression and yield age groups of 27−16 Ma and 10−6 Ma. Detrital monazite yield age distributions similar to those of the low (Dy/Yb)N metamorphic zircon except for the 821−402 Ma inherited cores. The (Dy/Yb)N of 31.6−5.7 Ma monazite decreases with increasing Y content, which indicates that it likely formed under the retrograde stage during garnet breakdown. Based on the oldest metamorphic ages, the initial India-Asia collision occurred no later than 50−44 Ma in the eastern Himalayan syntaxis. The multimodal age patterns of the metamorphic zircon and monazite indicate that the Indian continent underwent multistage HP and retrograde metamorphism in the eastern Himalayan syntaxis. The nearly contemporaneous HP and retrograde metamorphism indicate that the Indian continent continued subducting while the earlier HP metamorphic slices detached and exhumed.

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Contrasting CW and CCW tectono-metamorphic belts in the eastern Himalayan syntaxis: quantification of P–T–t paths and tectonic interpretation

Cited by 15 publications

References 128 publications

A modern pulse of ultrafast exhumation and diachronous crustal melting in the Nanga Parbat Massif

A modern pulse of ultrafast exhumation and diachronous crustal melting in the Nanga Parbat Massif

Intraoceanic Subduction System Within the Neo‐Tethys: Evidence From Late Cretaceous Arc Magmatic Rocks of the Eastern Himalaya

Tracing high-pressure metamorphism in the eastern Himalayan syntaxis using detrital zircon and monazite from modern stream sediments

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