Evidence for seafloor spreading in the Laxmi Basin, northeastern Arabian Sea

Bhattacharya, G.C.; Chaubey, A.K.; Murty, G.P.S.; Srinivas, K.; Sarma, K.V.L.N.S.; Subrahmanyam, V.; Krishna, K. S.

doi:10.1016/0012-821x(94)90216-x

Cited by 106 publications

(115 citation statements)

References 16 publications

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“…If the Palitana Ridge is an extinct spreading centre, the low-density body inferred under the fossil axis would resemble similar bodies postulated by Jonas et al (1991). Free-air short wavelength gravity anomaly lows atop broader gravity highs appear to be the general signature of extinct spreading centres as, for example, in the Coral Sea (Weissel and Watts, 1979), in the Laxmi Basin (Bhattacharya et al, 1994a).…”

Section: Interpretation Of Gravity Anomalies In the Gop Basinmentioning

confidence: 74%

“…The ~2 km high (with respect to the nearby basement depth), ~20 km wide Palitana Ridge is probably a construction associated with later stages of the volcanic activity, quite similar to the Hellas seamount on the Wharton fossil spreading centre (Hebert et al, 1999) and the Guadalupe Island on the Guadalupe fossil spreading centre (Batiza, 1977). The three major seamounts atop the inferred fossil spreading centre (the Panikkar Ridge) in the nearby Laxmi Basin (Bhattacharya et al, 1994a(Bhattacharya et al, , 1994b, is another possible example of such strong magmatism at fossil ridges. This abundant magmatism in both the Gop and Laxmi basins most likely reflects a relationship with the nearby Reunion hotspot.…”

Section: Geodynamic Consequencesmentioning

confidence: 82%

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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: Interpretation Of Gravity Anomalies In the Gop Basinmentioning

confidence: 74%

Section: Geodynamic Consequencesmentioning

confidence: 82%

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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“…• rifting between Madagascar and India during the Late Cretaceous, • short span of rifting between Seychelles-Laxmi Ridge and India around K-T boundary, and • rifting between Seychelles and Laxmi Ridge during the Early Tertiary (Norton and Sclater 1979;Courtillot et al 1988;White and McKenzie 1989;Bhattacharya et al 1994;Storey 1995; and volcanics of St. Mary Islands (85.6 ± 0.9 Ma) off southwest India. Numerous basaltic flows and intrusives related to Marion hotspot volcanism are also reported from the southwest India (Radhakrishna et al 1994;Kumar et al 2001;Pande et al 2001).…”

Section: Introductionmentioning

confidence: 97%

“…It is not yet conclusively established whether this rift event had led to establishment of seafloor spreading in the Laxmi Basin. Therefore, nature of crust underneath the Laxmi Basin and the adjacent offshore Indus Basin is still being debated to be either oceanic or stretched continental crust (Naini and Talwani 1983;Miles et al 1998;Bhattacharya et al 1994;Talwani and Reif 1998;Todal and Eldholm 1998;Krishna et al 2006;Collier et al 2009;Yatheesh et al 2009).…”

Section: Introductionmentioning

confidence: 98%

Seaward dipping reflectors along the SW continental margin of India: Evidence for volcanic passive margin

et al. 2010

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Multi-channel seismic reflection profiles across the southwest continental margin of India (SWCMI) show presence of westerly dipping seismic reflectors beneath sedimentary strata along the western flank of the Laccadive Ridge -northernmost part of the Chagos-Laccadive Ridge system. Velocity structure, seismic character, 2D gravity model and geographic locations of the dipping reflectors suggest that these reflectors are volcanic in origin, which are interpreted as Seaward Dipping Reflectors (SDRs).The SDRs; 15 to 27 km wide overlain by ∼ 1 km thick sediment; are observed at three locations and characterized by stack of laterally continuous, divergent and off-lapping reflectors. Occurrence of SDRs along western flank of the Laccadive Ridge adjacent to oceanic crust of the Arabian Basin and 2D crustal model deduced from free-air gravity anomaly suggest that they are genetically related to incipient volcanism during separation of Madagascar from India.We suggest that (i) SWCMI is a volcanic passive margin developed during India-Madagascar breakup in the Late Cretaceous, and (ii) continent-ocean transition lies at western margin of the Laccadive Ridge, west of feather edge of the SDRs. Occurrence of SDRs on western flank of the Laccadive Ridge and inferred zone of transition from continent to ocean further suggest continental nature of crust of the Laccadive Ridge.

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“…Oceanic crust is also likely to be present in the Gop Rift (e.g. Bhattacharya et al 1994;Minshull et al 2008), but in our interpretation this crust must taper out near the western tip of Laxmi Ridge. Finally, we explore the possible tectonic setting of this inferred earlier extension episode that separated the Murray Ridge from the Saurashtra High.…”

Section: Nature and Origin Of The Lithosphere In The Northeast Arabiamentioning

confidence: 99%

Crustal structure of the Murray Ridge, northwest Indian Ocean, from wide-angle seismic data

Minshull¹,

Edwards

Flueh

2015

Geophysical Journal International

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Evidence for seafloor spreading in the Laxmi Basin, northeastern Arabian Sea

Cited by 106 publications

References 16 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

Seaward dipping reflectors along the SW continental margin of India: Evidence for volcanic passive margin

Crustal structure of the Murray Ridge, northwest Indian Ocean, from wide-angle seismic data

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