New evidence for a thin crust and magmatic underplating beneath the Cambay rift basin, Western India through modelling of EIGEN-6C4 gravity data

Chouhan, Avinash Kumar; Choudhury, Pallabee; Pal, Sanjit Kumar

doi:10.1007/s12040-019-1335-y

Cited by 27 publications

(10 citation statements)

References 46 publications

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“…Seismic data does not support a contiguous presence of the RVF southwards into the Cambay Basin, as all overlying Tertiary formations onlap onto the Tharad and Diyodar Ridges of granites (Dolson et al, 2015; Rao & Tewari, 2005; Thiagaran et al, 2001), separating the Barmer from the Cambay Basin, where typical Deccan basaltic and rhyolitic volcanics underlie the Tertiary sedimentary fill of the Cambay Basin (Chouhan et al, 2020; Dixit et al, 2010; Mishra et al, 2019; Tewari et al, 1995). The RVF is therefore considered to be distinct from the Deccan volcanics of the Cambay Basin.…”

Section: Discussionmentioning

confidence: 99%

Syn‐rift volcanism in the Barmer Basin: An intra‐basin extrusive complex at the northern limit of the Deccan volcanic province in India

Burley

Gould²,

Taylor

et al. 2022

Geological Journal

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The Raageshwari Volcanic Formation (RVF) is a volcanic complex in the southern part of the Barmer Basin, NW India, localized around a large rift centre horst block, the Central Basin High. The RVF comprises an initial sequence of acid igneous rocks, which are of ignimbritic origin, termed the Agni Member, overlain by a stacked sequence of basaltic lava flows interbedded with subordinate pyroclastic deposits, the Prithvi Member. Seismic data confirms that the volcanic complex has a conical overall geometry and a layered internal structure produced by successive and extensive flows of basalt and ignimbrite, very similar to that observed in the main Deccan lava outcrops along the western margin of India. U–Pb zircon ages near the top of the Agni Member in the Raageshwari‐26 well give an age of 68+/−2 Ma for a tephrite pyroclastic unit, whilst Ar–Ar analysis of a distal basalt containing phenocrysts of biotite from the Saraswati‐4 well gave an older robust Ar–Ar plateau age of 73.7 ± 1.4 Ma. A typical Deccan age of 67.9 ± 1.7 Ma was obtained from the isolated unaltered basaltic andesite in well NE‐South‐1. Due to depositional on‐lap onto the Central Basin High, the overlying alluvial Dandlawas and Fatehgarh formations are absent on the crest of the Central Basin High and Barmer Hill Formation lake sediments rest directly on the basalts. This relationship indicates that the volcanic cone was a structural or topographic high during deposition onto which the Fatehgarh and Barmer Hill formations lake sediments eventually on‐lapped. The RVF of the Barmer Basin along with the Deccan volcanics in the Cambay Basin, Narmada Rift and in Saurasthra are all developed within fault‐bounded rift basins, in which deep seated faults extend beneath the Deccan volcanic sequence. They are associated with thermal anomalies and thinned continental crust and the presence of a linear low velocity zone at ~100 km depth in the upper mantle region beneath the Barmer and Cambay basins. This is interpreted to be the position of the “conduit” through which plume head material passed through the upper mantle before arriving at the base of the Indian lithosphere. The RVF therefore appears to be an early eruption of differentiated ultrabasic magma from a shallow, secondary magma chamber produced by partial crustal melting.

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Section: Discussionmentioning

confidence: 99%

Syn‐rift volcanism in the Barmer Basin: An intra‐basin extrusive complex at the northern limit of the Deccan volcanic province in India

Burley

Gould²,

Taylor

et al. 2022

Geological Journal

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“…The majority of the studies has focused on seismology, magnetotelluric and crustal deformation to find the possible reasons for the seismicity over the KRB (Rai et al 2004;Singh and Singh 2005;Chopra et al 2008Chopra et al , 2014Choudhury et al 2012;Rastogi et al 2012;Rastogi 2003, 2013;Seshu et al 2016;Gayatri et al 2017Gayatri et al , 2018Mandal 2020). Chouhan et al (2020a; and Kayal et al 2002 provided evidence of intrusive mafic body in the lower crustal depth in the region of KMF and SWF. The magnetotelluric studies also suggest the presence of a fluid reservoir beneath the Kutch Basin at a depth of 35-40 km (Gayatri et al 2017;Nagar et al 2020).…”

Section: Tectonic Framework and Structural Stylementioning

confidence: 98%

Introduction to Geology of the Kachchh (Kutch) Basin, Western India

2021

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“…Such interactions modify the underlying crustal structure, resulting in crustal thinning and magmatic emplacements as intrusive bodies within upper crustal layers and/or at the crust-upper mantle boundary. The magmatic bodies occurring at the base of the crust, known as underplating, play a significant role in crustal growth and evolution, thereby providing insights into the orogenies forming the current tectonic setup (Thybo and Nielsen, 2009;Thybo and Artemieva, 2013;Chouhan et al, 2020). Various tectonic settings, such as rift basins, collisional zones, volcanic provinces, and cratons affected by plumes, are attributed to the presence of underplated layers.…”

Section: Introductionmentioning

confidence: 99%

“…Extension tectonics can be associated with rifting either at far-off continental margins or initiated by uplift due to an upwelling mantle plume. The formation of intracratonic rift basins is generally credited to such extension tectonics, often accompanied by magmatic activities and formation of depressions, hosting sedimentary sequences deposited in different environments interlayered with volcanic formations, that cause underplating at the crust-mantle boundary (Thybo and Nielsen, 2009;Thybo and Artemieva, 2013;Chouhan et al, 2020). The pro-cess of underplating leads to the formation of materials with high density and with properties of high magnetic susceptibility at the deep crustal levels.…”

Section: Introductionmentioning

confidence: 99%

Magmatic underplating associated with Proterozoic basin formation: insights from gravity study over the southern margin of the Bundelkhand Craton, India

Mukherjee,

Mandal

2024

Solid Earth

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Abstract. Extension tectonics responsible for intracratonic rift basin formation are often the consequences of active or passive tectonic regimes. The present work puts forth a plume-related rifting mechanism for the creation and evolution of two Proterozoic sedimentary basins outlining the Bundelkhand Craton, namely the Bijawar and Vindhyan basins. Using global gravity data, a regional-scale study is performed over the region encompassing the southern boundary of the Bundelkhand Craton consisting of the Bijawar Basin, Vindhyan Basin, and Deccan basalt outcrops. The gravity highs in the central part of the complete Bouguer anomaly and the upward-continued regional anomaly, derived from global gravity grid data, suggest that the Vindhyan sedimentary basin overlies a deeper high-density crustal source. The deepest interface as obtained from the radially averaged power spectrum analysis is observed to occur at a depth of ∼30.3 km, indicating that the sources responsible for the observed gravity signatures occur at larger depths. The 3D inversion of complete Bouguer anomaly data based on Parker–Oldenburg's algorithm revealed the Moho depth of ∼32 km below the Vindhyan Basin, i.e., south of the craton. The 2D crustal models along two selected profiles showcase a thick underplated layer with a maximum thickness of ∼12 km beneath the southern part of the Bundelkhand Craton. The inferred large E–W-trending underplating and deciphered shallower Moho beneath the regions south of the exposed Bundelkhand Craton point to crustal thinning compensated for magmatic emplacement due to a Paleoproterozoic plume activity below the craton margin.

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New evidence for a thin crust and magmatic underplating beneath the Cambay rift basin, Western India through modelling of EIGEN-6C4 gravity data

Cited by 27 publications

References 46 publications

Syn‐rift volcanism in the Barmer Basin: An intra‐basin extrusive complex at the northern limit of the Deccan volcanic province in India

Syn‐rift volcanism in the Barmer Basin: An intra‐basin extrusive complex at the northern limit of the Deccan volcanic province in India

Introduction to Geology of the Kachchh (Kutch) Basin, Western India

Magmatic underplating associated with Proterozoic basin formation: insights from gravity study over the southern margin of the Bundelkhand Craton, India

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