Offshore Extension of Deccan Traps in Kachchh, Central Western India: Implications for Geological Sequestration Studies

Pandey, Dhananjai K.; Pandey, Anju; Rajan, S.

doi:10.1007/s11053-010-9133-x

Cited by 12 publications

(9 citation statements)

References 17 publications

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“…Because the Deccan Traps have been very precisely dated onshore (Baksi, 1994;Courtillot et al, 2000;Chenet et al, 2008), the relationship between opening of Laxmi Basin and emplacement of the Deccan Traps will be revealed if the basin crust can be dated. This would further improve our knowledge of whether or not and how far Deccan Flood Basalts extend offshore (Pandey et al, 2010(Pandey et al, , 2011. The potential cause behind the failure of rifting in Laxmi Basin shortly after the opening in the more clearly oceanic Gop Basin (Yatheesh et al, 2009;Chatterjee et al, 2013) is also not yet fully understood.…”

Section: Reconstruct Changes In Erosion and Weathering Intensity Overmentioning

confidence: 97%

“…The source of the mass transport deposit must be the Indian continental margin because it preserves a suitable sequence of Cenozoic shallow-water and slope deposits (Biswas, 1987;Whiting et al, 1994). Even the Deccan volcanic rock clasts can be derived from mass transport offshore because the province is known to extend out under the continental shelf (Karisiddaiah and Iyer, 1991;Pandey et al, 2011). In any case, suitable sources are not present on any other topographic high adjacent to Laxmi Basin (i.e., Laxmi Ridge or Panikkar Ridge).…”

Section: Mass Sediment Transportmentioning

confidence: 99%

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Pandey

Clift

Kulhanek

et al. 2015

International Ocean Discovery Program Preliminary Report

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The Indian (southwest) summer monsoon is one of the most intense climatic phenomena on Earth. Its long-term development has been linked to the growth of high topography in South and Central Asia. The Indian continental margin, adjoining the Arabian Sea, offers a unique opportunity to investigate tectonic-climatic interactions and the net impact of these processes on weathering and erosion of the western Himalaya. During International Ocean Discovery Program Expedition 355, two sites (U1456 and U1457) were drilled in Laxmi Basin in the eastern Arabian Sea to document the coevolution of mountain building, weathering, erosion, and climate over a range of timescales. In addition, recovering basement from the eastern Arabian Sea provides constraints on the early rifting history of the western continental margin of India with special emphasis on continental breakup between India and the Seychelles and its relationship to the plume-related volcanism of the Deccan Plateau.Drilling and coring operations during Expedition 355 recovered sediment from Sites U1456 and U1457 in the Laxmi Basin, penetrating 1109.4 and 1108.6 m below seafloor (mbsf ), respectively. Drilling reached sediment dated to 13.5-17.7 Ma (late early to early middle Miocene) at Site U1456, although with a large hiatus between the lowermost sediment and overlying deposits dated to <10.9 Ma. At Site U1457, a much longer hiatus occurs near the base of the cored section, spanning from 10.9 to ~62 Ma. At both sites, hiatuses span ~8.2-9.2 and ~3.6-5.6 Ma, with a possible condensed section spanning ~2.0-2.6 Ma, although the total duration for each hiatus is slightly different between the two sites.A major submarine fan draining the western Himalaya and Karakoram must have been supplying sediment to the eastern Arabian Sea since at least ~17 Ma. Sand mineral assemblages indicate that the Greater Himalayan Crystalline Sequence was fully exposed to the surface by this time. Most of the recovered sediment appears to be derived from the Indus River and includes minerals that are unique to the Indus Suture Zone, in particular glaucophane and hypersthene, most likely originating from the structural base of the Kohistan arc. Pliocene sandy intervals at Site U1456 were deposited in lower fan "sheet lobe" settings, with intervals of basin plain turbidites separated by hemipelagic muddy sections deposited during the Miocene. Site U1457 is more distal in facies, reflecting its more marginal setting. No major active lobe appears to have affected the Laxmi Basin since the Middle Pleistocene (~1.2 Ma).We succeeded in recovering sections spanning the 8 Ma climatic transition, when monsoon intensity is believed to have changed strongly, although the nature of this change awaits postcruise analysis. We also recovered sediment from a large mass transport deposit measuring ~330 and ~190 m thick at Sites U1456 and U1457, respectively. This section includes an upper sequence of slump-folded muddy and silty rocks, as well as underlying calcarenites and limestone breccias, to...

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Section: Reconstruct Changes In Erosion and Weathering Intensity Overmentioning

confidence: 97%

Section: Mass Sediment Transportmentioning

confidence: 99%

Untitled

Pandey

Clift

Kulhanek

et al. 2015

International Ocean Discovery Program Preliminary Report

View full text Add to dashboard Cite

show abstract

“…Because the Deccan Traps have been very precisely dated onshore (Baksi, 1994;Courtillot et al, 2000;Chenet et al, 2008), the relationship between opening of Laxmi Basin and emplacement of the Deccan Traps will be revealed if the basin crust can be dated. This would further improve our knowledge of whether or not, and how far, Deccan Flood Basalts extend offshore (Pandey et al, 2010(Pandey et al, , 2011. The potential cause behind the failure of rifting in Laxmi Basin to progress to seafloor spreading shortly after the opening in the more clearly oceanic Gop Basin (Yatheesh et al, 2009;Chatterjee et al, 2013) is also not yet fully understood.…”

Section: To Reconstruct Changes In Erosion and Weathering Intensity Overmentioning

confidence: 98%

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Pandey¹,

Clift²,

Kulhanek³

2016

Proceedings of the International Ocean Discovery Program

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“…Map showing location of geophysical data in the study area bounded by red polygon. Dark red solid circle on onshore represents drilled-well Suthari (Pandey et al 2011). Black solid circle: offshore drilled-well BS-1, red solid stars: drilled-wells in western offshore, purple solid triangles: refraction stations on the continental shelf and slope region (Rao 1967(Rao , 1970, blue solid triangles: refraction stations in the eastern basin (Naini and Talwani 1983), green solid triangles: refraction stations in the western basin (Naini and Talwani 1983).…”

Section: Structural Frameworkmentioning

confidence: 99%

“…P-wave velocity derived from earthquake data (Krishna 2004) and from dispersion of short-period Love wave data (Tandon 1973), is utilized in this study. In addition, sonic log and litholog data of a drilled-well (Suthari) (Pandey et al 2009(Pandey et al , 2011…”

Section: Onshore Datamentioning

confidence: 99%

Extension of flood basalt on the northwestern continental margin of India

Kumar

Chaubey

2019

J Earth Syst Sci

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The Deccan Continental Flood Basalt (DCFB) in central western India is a large igneous province that covers almost one-sixth area of India. It is erupted in less than 1 million years during the magnetic chron 29 r (∼65.6-64.8 Ma) through the Cretaceous-Tertiary boundary. It is believed that nearly an equivalent area of flood basalt, adjoining the DCFB, is submerged on the northwestern continental margin of India (NWCMI). Onshore information on the DCFB is widely reported in geological and geophysical studies. However, knowledge on the offshore extent of flood basalt is poorly known because of paucity of marine geophysical data and lack of an appropriate approach to determine the flood basalt. To fill this gap in knowledge, P-wave velocity in flood basalt as a proxy, drilled wells results, and published seaward dipping reflectors are used to delineate flood basalt extent on the NWCMI. The results of the study reveal that P-wave velocity in the flood basalt varies from 4.1 to 5.2 km/s. Apart from some isolated basement-high features, it is found that flood basalt lies below sediment and carpets the entire NWCMI extending up to the Laxmi-Laccadive ridges. The depth of occurrence of flood basalt ranges from 800 to 7400 m, with a maximum thickness of ∼3900 m in the eastern part of the Laxmi basin. The article presents preliminary results about the extension of flood basalt on the western continental margin of India which may be useful for researchers and Indian oil industries planning exploration activities in Mesozoic sediment of the margin for hydrocarbon prospects.

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Offshore Extension of Deccan Traps in Kachchh, Central Western India: Implications for Geological Sequestration Studies

Cited by 12 publications

References 17 publications

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Extension of flood basalt on the northwestern continental margin of India

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