Seismically constrained two-dimensional crustal thermal structure of the cambay basin

Thiagarajan, S.; Ramana, D. V.; N., S.

doi:10.1007/bf02702225

Cited by 14 publications

(6 citation statements)

References 14 publications

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“…The crustal thermal structure across the Trans European suture zone in the area of the POLONAISE 97 seismic experiment is presented in Majorowicz et al (2003). Thiagarajan et al (2001) presented the crustal thermal structure of the northern Cambay basin along the Tharad-Degam DSS profile. The crustal thermal structure of Godavari graben and the coastal basin along the Paloncha-Narsapur and KallurPolavaram DSS profiles is given by Ramana et al (2003).…”

Section: Introductionmentioning

confidence: 99%

A tentative 2D thermal model of central India across the Narmada-Son Lineament (NSL)

Rai

Thiagarajan

2006

Journal of Asian Earth Sciences

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Section: Introductionmentioning

confidence: 99%

A tentative 2D thermal model of central India across the Narmada-Son Lineament (NSL)

Rai

Thiagarajan

2006

Journal of Asian Earth Sciences

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“…The observed conductivity anomalies in the eastern part of the profiles (2-4) suggest localized structure and could be attributed to the sediments plus mid-crustal conductivity anomaly related to fluids released by metamorphic reaction at the lower crustal level that is reflected as a low velocity zone in seismic studies carried out in Cambay basin (Kaila et al 1990;Thiagarajan et al 2001;Dixit et al 2010).…”

Section: Discussionmentioning

confidence: 94%

Frequency characteristics of geomagnetic induction anomalies in Saurashtra region

Kumar

Rao

et al. 2017

J Earth Syst Sci

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Magnetovariational studies were carried out along four different EW profiles in Saurashtra region in different phases, during January 2007-March 2012. Transient geomagnetic field variations (X, Y horizontal field and Z vertical field components) recorded along these profiles are analyzed to infer the electrical conductivity distribution of the region. The vertical field transfer functions which depict the characteristics of electrical conductivity distribution are presented in the form of induction arrows. From the spatial distribution of these arrows, it is inferred that the sediments filling the offshore basins have more conductivity than those basins in Saurashtra region. Z /H pseudo sections along the four profiles in conjunction with tectonics and other geophysical methods permit to infer that the conductivity anomaly in the eastern part of the profiles is associated with the crustal/lithosphere thinning. The possible cause for these anomalies may be explained in terms of partial melts associated with mafic intrusions, related to Deccan and pre-Deccan volcanism. High resistive block related to underplating mantle material has been reflected in 1D models of long period magnetotelluric data and its thickness reduces from west to east. Lithosphere-asthenosphere boundary varies from 80 to 100 km.

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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: 98%

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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Seismically constrained two-dimensional crustal thermal structure of the cambay basin

Cited by 14 publications

References 14 publications

A tentative 2D thermal model of central India across the Narmada-Son Lineament (NSL)

A tentative 2D thermal model of central India across the Narmada-Son Lineament (NSL)

Frequency characteristics of geomagnetic induction anomalies in Saurashtra region

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

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