Late Mesoproterozoic to early Neoproterozoic evolution of the Meghalaya gneissic complex, NE India: significance in Rodinia assembly

Neogi, Sudipta; Pal, T. K.; Bandyopadhyay, Debaditya

doi:10.1080/00206814.2022.2140210

Cited by 4 publications

(4 citation statements)

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“…Notably, the temporal spread of their emplacement (2.1–1.46 Ga) coincides with the compressional orogeny in the southern mobile belt CITZ. Extensive research on the metamorphic evolution of the CITZ, ADFBs, Eastern Ghats Mobile Belts and MGC suggests a prolonged subduction accretion orogeny operating along the margins of the north and south Indian cratons, Western Australia and East Antarctica from 2.5 to 1.5 Ga ago (Bhowmik, 2019; Neogi et al, 2022).…”

Section: Discussionmentioning

confidence: 99%

“…The reported prolonged plume magmatism (spanning approxi- East Antarctica from 2.5 to 1.5 Ga ago (Bhowmik, 2019;Neogi et al, 2022).…”

Section: Spatial and Temporal Significancementioning

confidence: 98%

“…An accelerating voltage of 15 kV and 12 nA current with a 1‐μ beam diameter was set for the silicate analysis. A more detailed analytical description can be seen in Neogi et al (2022). The results are provided in Table 1.…”

Section: Analytical Techniquesmentioning

confidence: 99%

“…The Columbia supercontinent was formed by subduction accretion between the continents and has the highest packing density at 1.5 Ga (Bhowmik, 2019; Meert & Santosh, 2017). The 1500‐km long mobile belt (Aravalli‐Delhi Fold Belt [ADFB], Central Indian Tectonic Zone [CITZ], Chottanagpur Gneissic Complex [CGC], and Meghalaya Gneissic Complex [MGC]) in central India records long‐lived crustal reworking during the Columbia Orogeny (Bhowmik, 2019; Neogi et al, 2022). However, the impact of the Columbia Orogeny on the participating Indian continents (Aravalli, Bundelkhand, Bastar and Singhbhum cratons) has received little attention.…”

Section: Introductionmentioning

confidence: 99%

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Proterozoic mafic dyke swarms of Bundelkhand Craton, North India: A connection to Columbia supercontinent

Raju,

Bodas,

Anshu

et al. 2024

Geological Journal

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The present paper addresses petrography, geochemistry and Ar‐Ar geochronology of a significant number of mafic dykes from the Paleo‐ to Neoarchean Bundelkhand Craton in central India. The majority of the dykes are NW‐SE oriented (with a few NE‐SW and ENE‐WSW) with tholeiitic, sub‐alkaline and basalt to basaltic andesite composition. The trace element geochemistry of these dykes indicates an island arc setting during emplacement. The Ar‐Ar mineral dating (plagioclase) of three representative dykes reveals an emplacement age between 1.53 and 1.46 Ga. This finding and earlier reports (2.1–1.73 Ga) point to sustained mafic magmatism throughout the Bundelkhand Craton in a preferred structural orientation between 2.1 and 1.46 Ga. Mafic magmatism was episodic and can be linked to the perpetual subduction accretion processes between the central Indian Archean continents during the development of the Columbia supercontinent. The mafic dykes were emplaced at 45° to the maximum compression direction (E‐W), that is, along the line of no finite longitudinal strain. This time equivalent widespread NW‐SE and NE‐SW trending mafic dyke system is also relatable along the adjacent continents (Singhbhum, Bastar) and thus opened up a new paradigm for the dyke's emplacement across the Indian cratons.

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Section: Discussionmentioning

confidence: 99%

“…The reported prolonged plume magmatism (spanning approxi- East Antarctica from 2.5 to 1.5 Ga ago (Bhowmik, 2019;Neogi et al, 2022).…”

Section: Spatial and Temporal Significancementioning

confidence: 98%

Section: Analytical Techniquesmentioning

confidence: 99%