Early Tertiary seafloor spreading magnetic anomalies and paleo-propagators in the northern Arabian Sea

Chaubey, A.K.; Bhattacharya, G.C.; Murty, G.P.S.; Srinivas, K.; Ramprasad, T.; Rao, D. Gopala

doi:10.1016/s0012-821x(97)00178-7

Cited by 56 publications

(28 citation statements)

References 25 publications

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“…Widely observed highly reliable imprints of large scale ridge propagation in the area (Miles and Roest, 1993;Chaubey et al, 1998Chaubey et al, , 2002Dyment, 1998;Miles et al, 1998;Royer et al, 2002) indeed strengthen this inference.…”

Section: Discussionmentioning

confidence: 63%

“…Additional time constraints come from the adjacent Arabian Basin, where the seafloor spreading history is well established (e.g., Chaubey et al, 1998Chaubey et al, , 2002Dyment, 1998;Royer et al, 2002). Fig.…”

Section: Interpretation Of Magnetic Anomalies In the Gop Basinmentioning

confidence: 99%

“…The conjugate Arabian and Eastern Somali basins (Northwestern Indian Ocean) have been formed by seafloor spreading along the Carlsberg Ridge since early Tertiary time; the Laxmi and Laccadive ridges mark the landward boundary of this oceanic crust in the Arabian Basin (McKenzie and Sclater, 1971;Norton and Sclater, 1979;Naini and Talwani, 1982;Schlich, 1982;Bhattacharya et al, 1992;Chaubey et al, 1993Chaubey et al, , 1998Chaubey et al, , 2002Miles and Roest, 1993;Miles et al, 1998;Dyment, 1998;Royer et al, 2002). However, between the Laxmi Ridge and the India-Pakistan continental shelf is a wide region of deep offshore, whose genesis and evolution still remains to be confidently established.…”

Section: Introductionmentioning

confidence: 99%

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Early oceanic opening off Western India–Pakistan margin: The Gop Basin revisited

Yatheesh

Bhattacharya

Dyment

2009

Earth and Planetary Science Letters

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The Deccan Traps, one of the best known examples of rapid flood basalt, are considered as marking of the inception of a mantle plume on the Indian continental lithosphere. Their emplacement may be associated with the continental break-up of India and the Seychelles block and later formation of a new spreading centre, the Carlsberg Ridge, while spreading progressively ceased in the Mascarene Basin. Whether rifting, continental break-up, and seafloor spreading predated or were the consequence of the Deccan Traps emplacement is still a matter of debate. This issue is further complicated by the presence of a continental sliver, the Laxmi Ridge, and large basins lying landward of the Laxmi Ridge, such as the Laxmi and Gop basins, where nature of the crust is still ambiguous. The present study attempts to decipher the tectonic setting and the imprints of plume-ridge interaction in the Gop Basin, where the crust has been interpreted as either volcanics-intruded thinned continental crust or oceanic crust formed by a now extinct spreading centre. Based on interpretation of an updated compilation of marine geophysical data, the present study supports the oceanic nature of the crust underlying the Gop Basin and proposes the Palitana Ridge as the extinct spreading centre in this region. The prominent but short sequence of fairly linear magnetic anomalies in the Gop Basin does not allow a unique identification; it can be reasonably explained either as A31r-A25r (~69.3 -56.4 Ma) or as A29r-A25r (~64.8 -56.4 Ma) sequence. The variations of the spreading rates assumed by both these models suggest that spreading in the Gop Basin significantly slowed around 65 Ma, contemporaneous with the magmatic outburst of the Reunion plume on the adjacent western Indian mainland. Subsequently, the Gop Basin spreading centre was waning whereas a new spreading centre was developing further south, close to the (relatively) southward migrating plume. In this last stage, the Gop Basin spreading centre was associated with an abundant magmatism, probably supplied from the plume region.

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Section: Discussionmentioning

confidence: 63%

Section: Interpretation Of Magnetic Anomalies In the Gop Basinmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Early oceanic opening off Western India–Pakistan margin: The Gop Basin revisited

Yatheesh

Bhattacharya

Dyment

2009

Earth and Planetary Science Letters

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“…Previous studies using magnetic anomalies from the oceanic crust describe the juxtaposition of India and the Seychelles immediately before the onset of extensional tectonics (Chaubey et al, 1998;Royer et al, 2002). However, most plate tectonic reconstruction models for this region suggest a wide deepwater offshore region (Laxmi Basin, Gop Rift, and offshore Indus Basin) of ~300 km width between the Seychelles and the Indian subcontinent before the onset of seafloor spreading Royer et al, 2002).…”

Section: Background Geological Settingmentioning

confidence: 98%

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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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“…Chatterjee et al (2013) discuss India's long voyage from Gondwana to Asia and document the complex nature of breakup of Seychelles and Laxmi Ridge. The controversies in delineating the crustal structure below the Laxmi Ridge led to diverse conclusions like the ridge acts as a transitional boundary between rifted transitional type of crust lying landward and an oceanic crust on the other side (Naini and Talwani 1982;Kolla and Coumes 1990;Miles and Roest 1993) or LR is flanked on both sides by crusts that are oceanic in nature (Bhattacharya et al 1994;Malod et al 1997;Chaubey et al 1998). Earlier studies (Naini and Talwani 1982;Kolla and Coumes 1990;Miles and Roest 1993) considered the Laxmi Ridge to be a continental sliver with deep faulted basement.…”

Section: Introductionmentioning

confidence: 99%

A relook into the crustal architecture of Laxmi Ridge, northeastern Arabian Sea from geopotential data

et al. 2015

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In this study, we undertake analysis of ship-borne gravity-magnetic and satellite-derived free-air gravity (FAG) data to derive the crustal structure of Laxmi Ridge and adjacent areas. 2D and 3D crustal modelling suggests that the high resolution FAG low associated with the ridge is due to underplating and that it is of continental nature. From Energy Spectral Analysis, five-depth horizons representing interface between different layers are demarcated that match those derived from 2D models. Magnetic sources from EMAG2 data, various filtered maps and absence of underplating in the EW section suggest that the EW and NW-SE segment of the Laxmi Ridge is divided by the Girnar fracture zone and probably associated with different stages of evolution. From the derived inclination parameters, we infer that the region to the north of Laxmi Ridge, between Laxmi and Gop Basins, is composed of volcanic/basaltic flows having Deccan affinity, which might have been emplaced in an already existing crust. The calculated inclination parameters derived from the best fit 2D model suggests that the rifting in the Gop Basin preceded the emplacement of the volcanics in the region between Laxmi and Gop Basins. The emplacement of volcanic/basaltic flows may be associated with the passage of India over the Reunion hotspot.

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Early Tertiary seafloor spreading magnetic anomalies and paleo-propagators in the northern Arabian Sea

Cited by 56 publications

References 25 publications

Early oceanic opening off Western India–Pakistan margin: The Gop Basin revisited

Early oceanic opening off Western India–Pakistan margin: The Gop Basin revisited

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A relook into the crustal architecture of Laxmi Ridge, northeastern Arabian Sea from geopotential data

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