A Single Dras‐Kohistan‐Ladakh Arc Revealed by Volcaniclastic Records

Andjić, Goran; Zhou, Renjie; Jonell, Tara N.; Aitchison, Jonathan C.

doi:10.1029/2021gc010042

Cited by 15 publications

(9 citation statements)

References 172 publications

(283 reference statements)

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“…Andjić et al. (2022) argued that a single Dras‐Kohistan‐Ladakh arc formed above a south‐dipping intraoceanic subduction zone and accreted to Eurasia during the Early Cretaceous, after which it evolved above a north‐dipping subduction zone. Based on global tectonic reconstructions and seismic tomography, Yan et al.…”

Section: Discussionmentioning

confidence: 99%

“…Following the Borneo block colliding with the Sundaland margin, the subduction polarity reversed from south-to north-directed at the Woyla Arc. Andjić et al (2022) argued that a single Dras-Kohistan-Ladakh arc formed above a south-dipping intraoceanic subduction zone and accreted to Eurasia during the Early Cretaceous, after which it evolved above a north-dipping subduction zone. Based on global tectonic reconstructions and seismic tomography, Yan et al (2023) reported that a south-dipping intraoceanic subduction system within the Neo-Tethys allowed reasonable geological reconstructions during the Jurassic-Cretaceous period.…”

Section: Large-scale Intraoceanic Subduction System Across the Neo-te...mentioning

confidence: 99%

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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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Section: Discussionmentioning

confidence: 99%

Section: Large-scale Intraoceanic Subduction System Across the Neo-te...mentioning

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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“…However, we propose that the gabbroic rocks of Nidar, Chilas, and Kargil were formed along the parallel oceanic arc system within the Neo‐Tethys. More recently Andjić et al (2022) advocated a single Dras‐Kohistan‐Ladakh arc based on volcaniclastic records. Considering the comparable whole‐rock geochemical data, it can be deduced that the Cretaceous oceanic island arc system was geographically much more extensive within the Neo‐Tethys, spreading further east to Ladakh.…”

Section: Discussionmentioning

confidence: 99%

Petrogenetic, geochemical, and geochronological constraints on magmatic evolution of the Chilas Complex gabbros, Kohistan arc, NW Himalaya

et al. 2022

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The Kohistan Arc preserves an exquisite and ideal petrogenetic record for studying mafic magmatism in an arc environment. Here we report the geochronological, mineralogical, and geochemical data of the gabbros from the Chilas Complex of Kohistan in order to understand their genesis, timing, role in crustal thickening, and tectonic evolution in Neo‐Tethys. The mineral composition of orthopyroxene (Opx) in gabbros displays transitional to metamorphic behaviour with high amount of Al2O3 (0.59–2.66 wt.%), suggesting the influence of subsolidus re‐equilibration during cooling or magmatic crystallization. Thermobarometric constraints propose the crystallization of Chilas gabbros around 892–985°C and ≤1.5 GPa pressure coupled with high H2O content (5.6%–7.7%). Geochemical modelling and isotopic peculiarities such as (87Sr/86Sr)i (0.000018–0.704140) and 206Pb/204Pb (18.526–18.554) suggest that the source of gabbros was depleted, likely controlled by peridotite melts and experienced insignificant crustal contamination. Relatively lower ratios of Nb/Yb (0.89–3.32) and TiO2/Yb (0.14–0.79) imply that the garnet was not a residual phase during the partial melting of a mantle source. The Chilas gabbros with depletion in Nb and Ta, enrichment in light rare earth element (LREE)s, the lower Ce/Pb ratios, plot of Th/La versus Th, and negative anomalies of Eu provide a consistent clue regarding the negligible participation of recycled components. Zircon U–Pb concordant ages of 83–86 Ma indicate the timing of emplacement and a Cretaceous magmatic event in the Chilas Complex. We infer that the Cretaceous magmatic flare‐up is a significant crustal growth event of Kohistan and consider the underplating of mantle‐derived magmas as one of the primary reasons for the crustal thickening based on zircon Hf isotopic signatures. The average chemical composition of Kohistan Complex provides support for the generation of andesitic magmas in arcs and the “andesite model” of continental crustal growth. We propose the similar petrogenesis for the Nidar, Kargil, and Chilas gabbros linking the formation of these variants within Neo‐Tethys based on identical magmatic records.

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“…The younger mafic dykes trending NW-SE in the Tirit granitoids may be related to the activity on the strike-slip Karakoram fault. Evaluating the complex and competing versions of this history, however, requires a more detailed (and expanded) study (Andjić et al 2022).…”

Section: Tectonic Significancementioning

confidence: 99%

“…Evaluating the complex and competing versions of this history, however, requires a more detailed (and expanded) study (Andjić et al . 2022).…”

Section: Tectonic Significancementioning

confidence: 99%

Nature of the Shyok (Northern) Suture Zone between India and Asia: petrology, geochemistry and origin of the Tirit granitoids and associated dykes (Nubra Valley Ladakh Himalaya, NW India)

et al. 2023

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The Shyok Suture Zone is an oceanic remnant of the Neo-Tethyan ocean sandwiched between the Ladakh Batholiths to the south and Karakoram Batholith to the north. The Tirit granitoids in this suture are dark-coloured, relatively rich in ferromagnesian minerals and range from granodiorite–tonalite to gabbro–diorite in composition. Mafic igneous enclaves are quite common and they are intruded by NW–SE parallel doleritic and aplitic dykes. The Tirit granitoids have a wide range of major oxide compositions (SiO2 = 52.1–72.11 wt %, TiO2 = 0.21–1.23 wt %, Al2O3 = 11.42–13.52 wt %, MgO = 1.69–10.69 wt % and CaO = 3.24–9.31 wt %) and show calc-alkaline, metaluminous, I-type characteristics, transitional between primitive and mature arc continental plutons. Rare earth elements (REE) show considerable enrichment in light REE (LREE) as compared to the heavy REE (HREE). Late Cretaceous U/Pb dates (74–68 Ma) show that they formed during the pre-collision northward movement of India. The Tirit dykes are only slightly younger and probably part of the same episode.

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A Single Dras‐Kohistan‐Ladakh Arc Revealed by Volcaniclastic Records

Abstract: Table S4. Whole-rock geochemical compositions of the Jurutze and Nindam formations (Zanskar Gorge, Ladakh, India). File S1. Compilation of references used for comparison in detrital zircon and whole-rock geochemical plots.

Cited by 15 publications

References 172 publications

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

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

Petrogenetic, geochemical, and geochronological constraints on magmatic evolution of the Chilas Complex gabbros, Kohistan arc, NW Himalaya

Nature of the Shyok (Northern) Suture Zone between India and Asia: petrology, geochemistry and origin of the Tirit granitoids and associated dykes (Nubra Valley Ladakh Himalaya, NW India)

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