Mechanics of mafic dyke swarms in the Deccan Large Igneous Province: Palaeostress field modelling

Ju, Wei; Hou, Guiting; Hari, K.R.

doi:10.1016/j.jog.2013.02.002

Cited by 50 publications

(18 citation statements)

References 81 publications

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“…After this, due to rapid drift of the Indian plate rotating at 1.0°/Ma, the secondary magmatic chambers were formed in two phases. The first phase is when the reunion hotspot is under Nasik-Pune region and the second phase is when the hotspot is underneath west coast (Chenet et al 2007, Wei et al 2013. The intrusive bodies delineated in our model are formed during the terminal phase of the reunion hotspot.…”

Section: Discussionmentioning

confidence: 97%

“…The intrusive bodies present in the study region are formed during the second phase of the reunion hotspot activity. At about 67 Ma, the flood volcanism from the Plume head of the reunion hotspot started which resulted in the formation of the primary magmatic chamber formed at the crust-mantle boundary as an under-plated layer (Bhattacharji et al 1996;Wei, Hou and Hari 2013). After this, due to rapid drift of the Indian plate rotating at 1.0°/Ma, the secondary magmatic chambers were formed in two phases.…”

Section: Discussionmentioning

confidence: 99%

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3D upper crustal density structure of the Deccan Syneclise, Central India

Prasad

Singh

Tiwari

2018

Geophysical Prospecting

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A constrained 3D density model of the upper crust along a part of the Deccan Syneclise is carried out based on the complete Bouguer anomaly data. Spectral analysis of the complete Bouguer gravity anomaly map of the study region suggests two major sources: short wavelength anomalies (<100 km) caused primarily due to the density inhomogeneities at shallow crustal level and long wavelength anomalies (>100 km) produced due to the sources deeper than the upper crust. A residual map of the short wavelength anomalies is prepared from the complete Bouguer anomaly using Butterworth high‐pass filter (100 km cut‐off wavelength). Utilizing the constraints from deep resistivity sounding, magnetotellurics and deep seismic sounding studies, 2.5D density models have been generated along 39 profiles of this region. The mismatch between the calculated response of the a priori 2.5D model with the residual (short wavelength) gravity anomalies is minimized by introducing high‐density intrusive bodies (≥2.81 g/cm3) in the basement. With these 2.5D density models, the initial geometry of our 3D density model, which includes alluvium, Deccan trap, Mesozoic sediment and high‐density intrusive bodies in the basement up to a depth of 7 km (upper crust), is generated. In the final 3D model, Deccan trap extends from 200 m to nearly 1700 m below the 90–150 m thick Quaternary sediment. Further down, the sub‐trappean Mesozoic sediment is present at a depth range of 600–3000 m followed by the basement. The derived 3D density model also indicates six intrusive bodies of density 2.83 g/cm3 in the basement at an average depth of about 4–7 km that best fits the residual gravity anomaly of the study area.

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Section: Discussionmentioning

confidence: 97%

Section: Discussionmentioning

confidence: 99%

3D upper crustal density structure of the Deccan Syneclise, Central India

Prasad

Singh

Tiwari

2018

Geophysical Prospecting

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“…Three major dyke systems have been identified from the DLIP which are the Narmada-Tapi dyke swarm, the Nasik-Pune dyke swarm, and the West Coast dyke swarm (Ju, Hou, & Hari, 2013;Vanderkluysen, Mahoney, Hooper, Sheth, & Ray, 2011). The Narmada-Tapi dyke swarm strikes ENE-WSW parallel to the Narmada-Tapti valleys (Kumar & Shrivastava, 2009).…”

Section: Geological Backgroundmentioning

confidence: 99%

Tholeiitic basalts of Deccan large igneous province, India: An overview

2019

Self Cite

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The Deccan large igneous province (DLIP) of Peninsular India is predominantly composed of tholeiitic basalts with a minor amount of alkaline, carbonatite, and silicic rocks. The tholeiitic basalts of DLIP are enriched in incompatible trace elements and divisible into low‐Ti basalts (TiO2 < 2.5; Ti/Y < 500) and high‐Ti basalts (TiO2 > 2.5; Ti/Y > 500). Despite variable total REE content, both low‐Ti and high‐Ti basalts exhibit almost similar geochemical patterns in the chondrite‐ and primitive‐ mantle‐normalized diagrams. The mantle potential temperature (Tp) of high‐Ti tholeiites estimated at Ca.1368°C, which is consistent with an ambient mantle temperature (1300–1400°C) whereas the Tp of low‐Ti tholeiites is around 1553°C, which indicates its derivation from the mantle plume axis. Extensive assimilation of the crustal components into the ascending plume have masked the nature and compositional characteristics of both high‐ and low‐Ti basalts. The low‐Ti basalts indicate significant contamination with crustal components than the high‐Ti basalts. The geochemical and isotopic compositions indicate the involvement of multiple mantle components. In general, the differentiated tholeiites of DLIP are the products of plume and depleted sections of the mantle with or without contributions from the continental crust. The main phase of Deccan magmatism intensely affected the atmosphere and hydrosphere, which was a possible trigger for the mass extinction event at the K–Pg boundary.

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“…Understanding and interpretation of where and when fractures would develop within a geological structure along with their orientation and intensity can be important to both exploration and production planning activities. The geological factors controlling development of the fractures include proximity to faults, position on folds, differential stress, lithology and their combination and layer thickness [5]- [11]. Many studies have found that fractures often develop around fault zones and anticlinal core, and that fracture spacing is positively correlated with regional differential stress [12] [13] [14].…”

Section: Introductionmentioning

confidence: 99%

Geomechanical Modeling of Stress and Fracture Distribution during Contractional Fault-Related Folding

Gu¹

2017

GEP

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Understanding and predicting the distribution of fractures in the deep tight sandstone reservoir are important for both gas exploration and exploitation activities in Kuqa Depression. We analyzed the characteristics of regional structural evolution and paleotectonic stress setting based on acoustic emission tests and structural feature analysis. Several suites of geomechanical models and experiments were developed to analyze how the geological factors influenced and controlled the development and distribution of fractures during folding. The multilayer model used elasto-plastic finite element method to capture the stress variations and slip along bedding surfaces, and allowed large deformation. The simulated results demonstrate that this novel Quasi-Binary Method coupling composite failure criterion and geomechanical model can effectively quantitatively predict the developed area of fracture parameters in fault-related folds. High-density regions of fractures are mainly located in the fold limbs during initial folding stage, then gradually migrate from forelimb to backlimb, from limbs to hinge, from deep to shallow along with the fold uplift. Among these factors, the fold uplift and slip displacement along fault have the most important influence on distributions of fractures and stress field, meanwhile the lithology and distance to fault have also has certain influences. When the uplift height exceeds approximately 55 percent of the total height of fold the facture density reaches a peak, which conforms to typical top-graben fold type with large amplitude and high-density factures in the top. The overall simulated results match well with core observation and FMI results both in the whole geometry and fracture distribution.

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Mechanics of mafic dyke swarms in the Deccan Large Igneous Province: Palaeostress field modelling

Cited by 50 publications

References 81 publications

3D upper crustal density structure of the Deccan Syneclise, Central India

3D upper crustal density structure of the Deccan Syneclise, Central India

Tholeiitic basalts of Deccan large igneous province, India: An overview

Geomechanical Modeling of Stress and Fracture Distribution during Contractional Fault-Related Folding

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