Paleomagnetic investigation of the Early Permian Panjal Traps of NW India; regional tectonic implications

Stojanovic, D.; Aitchison, Jonathan C.; Ali, Jason R.; Ahmad, Talat; Dar, Reyaz Ahmad

doi:10.1016/j.jseaes.2015.09.028

Cited by 20 publications

(4 citation statements)

References 64 publications

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“…Plates rotate rigidly across the globe surface with Africa as the center for relative motion. The commonly accepted versions of Gondwana configuration are adopted with updated paleo-positions of Lhasa, Sibumasu, and the estimated space for greater India 44 59 65 67 68 69 . Afghanistan moved in pair with Iran after 290 Ma 12 16 19 66 , Sibumasu moved in pair with Qiantang after 289 Ma 67 70 71 72 .…”

Section: Methodsmentioning

confidence: 99%

The initial break-up of Pangæa elicited by Late Palæozoic deglaciation

Yeh

Shellnutt

2016

Sci Rep

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The break-up of Pangæa was principally facilitated by tensional plate stress acting on pre-existing suture zones. The rifting of Pangæa began during the Early Permian along the southern Tethys margin and produced the lenticular-shaped continent known as Cimmeria. A mantle-plume model is ascribed to explain the rift-related volcanism but the NW-SE oriented Cimmerian rifts do not correlate well with pre-existing suture zones or ‘structural heterogeneities’ but appear to have a pertinent spatial and temporal association with Late Palæozoic glacial-interglacial cycles. Mantle potential temperature estimates of Cimmerian rift-related basalts (1410 °C ± 50 °C) are similar to ambient mantle conditions rather than an active mantle-plume rift as previously suggested. Moreover, we find that the distribution of glacial deposits shows significant temporal and spatial concurrence between the glacial retreat margins and rifting sites. We conclude that the location and timing of Cimmerian rifting resulted from the exploitation of structural heterogeneities within the crust that formed due to repeated glacial-interglacial cycles during the Late Palæozoic. Such effects of continental deglaciation helped to create the lenticular shape of Cimmeria and Neotethys Ocean suggesting that, in some instances, climate change may directly influence the location of rifting.

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Section: Methodsmentioning

confidence: 99%

The initial break-up of Pangæa elicited by Late Palæozoic deglaciation

Yeh

Shellnutt

2016

Sci Rep

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“…The characteristics of basalts from the southern Qiangtang and Tethyan Himalaya suggest the presence of crustal contamination [e.g., Zhu et al , ; Zhai et al , ]. The Panjal Traps basalts in the Kashmir Valley are considered to be derived from ocean island basalt (OIB)‐like mantle contaminated to varying degrees by continental crustal components [e.g., Chauvet et al , ; Shellnutt et al , ; Rehman et al , ; Stojanovic , ]. The occurrence of negative Nb anomalies is generally suggestive of crustal contamination.…”

Section: Discussionmentioning

confidence: 99%

“…The geochemical characteristics of whole-rock and hornblende analyses suggest that the protoliths of the Nagqu amphibolites are akin to N-MORB. Journal of Geophysical Research: Solid Earth 10.1002/2016JB013693 Chauvet et al, 2008;Shellnutt et al, 2014;Rehman et al, 2016;Stojanovic, 2016]. The occurrence of negative Nb anomalies is generally suggestive of crustal contamination.…”

Section: Petrogenesis Of the Nagqu Mafic Rocksmentioning

confidence: 99%

Early Permian mafic dikes in the Nagqu area, central Tibet, China, associated with embryonic oceanic crust of the Meso‐Tethys Ocean

Chen

Shi

et al. 2017

JGR Solid Earth

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During the latest Carboniferous to Early Permian, a possible mantle plume initiated continental rifting along the northern Gondwana margin, which subsequently developed into the Meso‐Tethys Ocean. However, the nature and timing of the embryonic oceanic crust of the Meso‐Tethys Ocean remain poorly understood. Here we present for the first time a combined analysis of petrological, geochronological, geochemical, and Sr‐Nd isotopic data for mafic rocks from the Nagqu area, central Tibet. Zircons from the mafic rocks yield a concordant age of ~277.8 ± 1.8 Ma, which is slightly younger than the age of mantle plume activity (~300–279 Ma), as represented by the large igneous province (LIP) on the northern Gondwana margin. Geochemical features suggest that the Nagqu mafic rocks, which display normal mid‐ocean ridge basalt affinities, are different from those of the LIP, which display oceanic island basalt‐type affinities. The Nagqu mafic rocks result from a relatively high degree of melting of depleted asthenospheric mantle. Combined with observations from previous studies, we suggest that the late Early Permian Nagqu magmatism fully records processes of early stage rifting and incipient formation of oceanic crust. Moreover, the patterns of magmatism are consistent with patterns of rift‐related sedimentation that records the transition from predominantly continental to marine deposition in the region during the Carboniferous‐Permian. We therefore suggest that rifting of the eastern Cimmerian and northern Gondwana continents started at ~277.8 Ma, and the rifting culminated in the opening of the Meso‐Tethys Ocean.

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“…The timing of the opening of the Neotethys remains an open question. Based on the late Carboniferous-early Permian large igneous provinces in the Indian and Australian blocks, as well as coeval extensive basalts and mafic dikes in southern Tibet, the Pangea supercontinent was suggested to have broken up during the early Permian, which triggered the initial opening of the Neotethys (Chauvet et al, 2008;Garzanti et al, 1999;Lapierre et al, 2004;Stojanovic et al, 2016;Veevers and Tewari, 1995).…”

Section: Opening Timing Of the Neotethysmentioning

confidence: 99%

Identification of a new source for the Triassic Langjiexue Group: Evidence from a gabbro-diorite complex in the Gangdese magmatic belt and zircon microstructures from sandstones in the Tethyan Himalaya, southern Tibet

Zhao

et al. 2019

Geosphere

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Considerable debate persists as to the Triassic paleogeographic framework of the Neotethys and the origin of the Late Triassic Langjiexue Group in the Tethyan Himalaya. Triassic magmatic rocks in the Gangdese belt and Late Triassic Langjiexue sediments play a pivotal role in addressing these issues. Geochronological, petrological, and geochemical analyses have been performed on the Middle Triassic gabbro-diorite complex (with crystallization ages of ca. 244–238 Ma) from the Gangdese belt. These plutonic rocks are characterized by relatively low MgO and high Al2O3 contents, calc-alkaline trends, and depletion of Nb, Ta, and Ti, resembling low-MgO high-alumina basalts or basaltic andesites. These plutonic rocks exhibit depleted whole-rock εNd(t) values of ∼+5 and zircon εHf(t) values peaking at ∼+14. These features resemble those of rocks in a subduction-related arc setting. We also completed detrital zircon U-Pb dating and microstructure analysis for the sandstones of the Langjiexue Group in the Tethyan Himalaya. Zircon grains with ages >300 Ma are dominated by preweathered and weathered surfaces as well as fairly rounded to completely rounded scales, indicating a high degree of polycyclicity. In contrast, 300–200 Ma ones are characterized by fresh surfaces and completely unrounded to poorly rounded scales, indicating nearby sources. Collectively, our data, combined with published results, support that the subduction initiation of the Neotethys began no later than the Middle Triassic. Arc-affinity magmatic rocks supplied some materials to the Langjiexue Group. This scenario sheds new light on the provenance of the Langjiexue Group and the Triassic paleogeography of the Neotethyan realm.

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Paleomagnetic investigation of the Early Permian Panjal Traps of NW India; regional tectonic implications

Cited by 20 publications

References 64 publications

The initial break-up of Pangæa elicited by Late Palæozoic deglaciation

The initial break-up of Pangæa elicited by Late Palæozoic deglaciation

Early Permian mafic dikes in the Nagqu area, central Tibet, China, associated with embryonic oceanic crust of the Meso‐Tethys Ocean

Identification of a new source for the Triassic Langjiexue Group: Evidence from a gabbro-diorite complex in the Gangdese magmatic belt and zircon microstructures from sandstones in the Tethyan Himalaya, southern Tibet

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