Gravity and magnetic signatures of volcanic plugs related to Deccan volcanism in Saurashtra, India and their physical and geochemical properties

Chandrasekhar, D. V.; Mishra, D. C.; Rao, Gang; Rao, J. Mallikharjuna

doi:10.1016/s0012-821x(02)00712-4

Cited by 64 publications

(43 citation statements)

References 24 publications

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“…Thus, the intrusions in this area look different from other alkaline intrusion studies discussed in our introduction. Some of those studies (Bott and Tantrigoda, 1987;Arzamastsev et al, 2000;Rugenski et al, 2001;Chandrasekhar et al, 2002) modeled the alkaline complexes as relatively narrow vertical cylinders at greater depths, and others as sub-vertical concentric bodies widening downwards. Spheres and cylinders with comparable lateral and vertical dimensions were found, in agreement with the field exposures and the idea that at least some part of these intrusions were emplaced as crystal mushes, assembling as sphere-like bodies at the Precambrian/Phanerozoic unconformity.…”

Section: Discussionmentioning

confidence: 99%

“…The main magnetic anomalies resemble magnetic dipoles. Density measurements range from 2.8 to 3.4 g/cm 3 and susceptibility ranges from 0.02 to 0.05 SI, with strong remnant magnetization (Dindi and Swain, 1988;Arzamastsev et al, 2000;Chandrasekhar et al, 2002). Dutra and Marangoni (2009) measured densities from 2.6 to 3.1 g/cm 3 and susceptibility from 0.01 to 0.06 SI for fresh rock outcrops in the Goiás Alkaline Province.…”

Section: Introductionmentioning

confidence: 96%

“…Forward modeling of the gravity or magnetic signal of alkaline intrusive complexes have been done by Bott and Tantrigoda (1987) in the intrusive complex located at Mull in NW Scotland, by Dindi and Swain (1988) in the Jombo Alkaline Complex, a large complex in Kenya, by Arzamastsev et al (2000) in Kola Alkaline Province in the northeastern Scandinavian Shield, by Rugenski et al (2001) who modeled the Pariquera-Açu alkaline complex emplaced in southeast Brazil, and by Chandrasekhar et al (2002) who studied volcanic plugs associated with the Deccan Volcanic Province in Saurashtra, India. These complexes display strong gravity and magnetic anomalies.…”

Section: Introductionmentioning

confidence: 99%

“…Authors have used geometrical forms resembling cone trunks or plugs for density models in 2.5D or 3D forward modeling (Bott and Tantrigoda, 1987;Chandrasekhar et al, 2002). The body depths in the works mentioned above range from 6 km with a density contrast of 0.4 g/cm 3 to 12 km with lower density contrasts (0.3 g/cm 3 ).…”

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Investigation of the Goiás Alkaline Province, Central Brazil: Application of gravity and magnetic methods

Dutra¹,

Marangoni²,

Junqueira-Brod

2012

Journal of South American Earth Sciences

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Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 96%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Investigation of the Goiás Alkaline Province, Central Brazil: Application of gravity and magnetic methods

Dutra¹,

Marangoni²,

Junqueira-Brod

2012

Journal of South American Earth Sciences

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“…Chandrasekhar et al 2002;Rymer and Brown 1986). Thus, to provide insights into their internal structure and post-shield evolution, many gravity surveys have been undertaken on ocean island volcanoes, for example, in Hawaiiian chain (Kauahikaua et al 2000;Zucca et al 1982) or La Re´union (Rousset et al 1989;Malengrau et al 1999), Gala´pagos (Canales et al 2002) and Azores (Camacho et al 1997;Montesinos et al 2003).…”

Section: Introductionmentioning

confidence: 99%

Using a genetic algorithm for 3-D inversion of gravity data in Fuerteventura (Canary Islands)

Montesinos¹,

Arnoso²,

Vieira³

2005

Int J Earth Sci (Geol Rundsch)

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The use of genetic algorithms in geophysical inverse problems is a relatively recent development and offers many advantages in dealing with the non-linearity inherent in such applications. We have implemented a genetic algorithm to efficiently invert a set of gravity data. Employing several fixed density contrasts, this algorithm determines the geometry of the sources of the anomaly gravity field in a 3-D context. The genetic algorithms, based on Darwin's theory of evolution, seek the optimum solution from an initial population of models, working with a set of parameters by means of modifications in successive iterations or generations. This searching method traditionally consists of three operators (selection, crossover and mutation) acting on each generation, but we have added a further one, which smoothes the obtained models. In this way, we have designed an efficient inversion gravity method, confirmed by both a synthetic example and a real data set from the island of Fuerteventura. In the latter case, we identify crustal structures related to the origin and evolution of the island. The results show a clear correlation between the sources of gravity field in the model and the three volcanic complexes recognized in Fuerteventura by other geological studies.

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Two distinct shear wave splitting directions in the northwestern Deccan Volcanic Province

et al. 2013

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[1] The northwestern Deccan Volcanic Province in India has witnessed several tectonic episodes resulting in the formation of rift zones, wide spread magmatism, and deep-seated faults that are host to some deadly intraplate earthquakes. In this study, we attempt to decipher the mantle deformation beneath the region using the SKS splitting technique applied to high-quality data from a regional network comprising 44 broadband seismic stations sited on diverse tectonic environments. The first measurements of 461 (312 SKS and 149 SKKS) splitting parameters from 117 earthquake sources reveal two major trends, one coinciding with the absolute plate motion (APM) of the Indian plate and the other roughly oriented in the E-W direction. Forward modeling of the dependence of the splitting parameters on incoming polarization assuming horizontal axis of symmetry brings out two layers of anisotropy beneath the study region with the fast axis azimuths oriented N22 ı E in the bottom layer and N77 ı E in the top layer. While stronger anisotropy (ıt 1.2 s) in the bottom layer is related to asthenospheric flow, a weaker anisotropy (ıt 0.5 s) in the upper layer could represent anisotropy frozen in the lithosphere due to deformation related to widespread magmatism in this plume affected region.

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Gravity and magnetic signatures of volcanic plugs related to Deccan volcanism in Saurashtra, India and their physical and geochemical properties

Cited by 64 publications

References 24 publications

Investigation of the Goiás Alkaline Province, Central Brazil: Application of gravity and magnetic methods

Investigation of the Goiás Alkaline Province, Central Brazil: Application of gravity and magnetic methods

Using a genetic algorithm for 3-D inversion of gravity data in Fuerteventura (Canary Islands)

Two distinct shear wave splitting directions in the northwestern Deccan Volcanic Province

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