New gravity map of the western Galicia margin: The Spanish exclusive economic zone project

Carbó, A.; Muñoz, Araceli; Druet, M.; Llanes, P.; Álvarez, Jesús de la Ascensión Salas

doi:10.1029/2004eo520002

Cited by 2 publications

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“…Even in subsequent ages (in early Tertiary) the Réunion hot spot had shown its influence on spreading segments of Carlsberg Ridge and propagated in westward and eastward up to 46 Ma [ Chaubey et al , 1998; Dyment , 1998]. The gravity anomalies and crustal structure of the western continental margin of India (Figure 11) are comparable to that of western Galicia margin, off Spanish coast [ Carbo et al , 2004]. The Galicia margin consists of Iberian Abyssal Plain, Galicia Bank, and Interior Galicia Basin similar to Western Basin, Laxmi Ridge, and Laxmi Basin, respectively, of the western continental margin of India.…”

Section: Nature Of the Crust Below The Laxmi Basin: Continental Or Ocmentioning

confidence: 99%

“…The Galicia margin consists of Iberian Abyssal Plain, Galicia Bank, and Interior Galicia Basin similar to Western Basin, Laxmi Ridge, and Laxmi Basin, respectively, of the western continental margin of India. Carbo et al [2004] have attributed a relative gravity high of the Interior Galicia Basin to the extremely stretched continental crust, where Moho is observed at a minimum depth of 14 km below sea level. The Laxmi Basin is also underlain by extremely stretched continental crust with a thickness of about 14 km excluding water slab (Figure 11).…”

Section: Nature Of the Crust Below The Laxmi Basin: Continental Or Ocmentioning

confidence: 99%

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Nature of the crust in the Laxmi Basin (14°–20°N), western continental margin of India

2006

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The nature of the crust in the Laxmi Basin, western margin of India, is an uncertain issue; more importantly, this has implications on paleogeographic reconstructions of the western Indian Ocean. We have analyzed three geophysical data sets and modeled gravity and magnetic anomalies for determining nature of the crust. Basement of the Laxmi Basin includes numerous highs, which make the basement uneven and shallower compared to the Western Basin. The Laxmi Basin is characterized by a broad gravity high and a narrower prominent gravity low within it, while within the basin the broad anomaly gradually increases toward north. The Panikkar Ridge is associated with the gravity low, which is comparable, at least in sign, to known negative gravity anomaly of the Laxmi Ridge. Intrusive structures mapped in the Laxmi Basin coincide with significant magnetic anomalies, which were earlier interpreted as seafloor‐spreading anomalies. Model studies reveal that the Laxmi Basin consists of ∼14 km thick stretched continental crust, in which magmatic bodies have been emplaced, whereas the Panikkar Ridge remains less altered stretched continental crust. The crust of the Laxmi Basin is mostly thinner than crust under the Laxmi Ridge and continental margin. In addition to the rift‐drift‐related stretching of the continental margin, the Laxmi Basin possibly has undergone extra stretching in E‐W direction during the pre‐Tertiary period. At ∼68 Ma Deccan volcanism on western India may have disrupted the initial conditions that were leading to onset of spreading in the basin. Subsequently the Réunion hot spot had emplaced the volcanic material within the stretched thinned continental crust. We interpret the Laxmi Basin as a failed rift, undergone stretching following intraplate kinematics prior to Deccan volcanism.

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Section: Nature Of the Crust Below The Laxmi Basin: Continental Or Ocmentioning

confidence: 99%

Section: Nature Of the Crust Below The Laxmi Basin: Continental Or Ocmentioning

confidence: 99%

Nature of the crust in the Laxmi Basin (14°–20°N), western continental margin of India

2006

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Atypical seismic signals at the Galicia Margin, North Atlantic Ocean, related to the resonance of subsurface fluid-filled cracks

2007

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New gravity map of the western Galicia margin: The Spanish exclusive economic zone project

Cited by 2 publications

References 14 publications

Nature of the crust in the Laxmi Basin (14°–20°N), western continental margin of India

Nature of the crust in the Laxmi Basin (14°–20°N), western continental margin of India

Atypical seismic signals at the Galicia Margin, North Atlantic Ocean, related to the resonance of subsurface fluid-filled cracks

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