Distribution and Origin of Seamounts in the Central Indian Ocean Basin

Das, P.; Iyer, Sridhar D.; Kodagali, V. N.; Krishna, K. S.

doi:10.1080/01490410500204637

Cited by 22 publications

(12 citation statements)

References 28 publications

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“…The area beyond 15 S is again one of medium relief. Das et al (2005) observed the CIOB to be highly deformed in the north and northeast as compared to the southern part, while seamounts are common in the southern area.…”

Section: Physiographic Featuresmentioning

confidence: 92%

“…Spilites are rare on the sea floor and are less abundant vis-à-vis N-MORB. In the CIOB, spilites occur near the Indrani fracture zone at 79 E. This fracture zone has a throw of $300 m towards the east (Kamesh Raju et al, 1993), hosts several seamounts (Das et al, 2005), and was probably reactivated. 'Fresh' and altered spilites were recovered and these are fine to medium grained with albitic plagioclase (few as phenocrysts), clinopyroxene and olivine, while epidote, hematite, chlorite and ore minerals are minor in occurrence.…”

Section: The Volcanics: Types Occurrence Descriptionsmentioning

confidence: 98%

“…There have been sporadic investigations concerning the CIOB seamounts (Mukhopadhyay Jauhari and S. D. Iyer and Khadge, 1990;Kodagali, 1992;Mukhopadhyay and Batiza, 1994). Das et al (2005), based on several multibeam maps, studied in great detail the distribution and origin of seamounts in the basin and identified eight chains of N-S trending seamounts. They suggested the seamount chains to have originated from propagative fractures and were produced between 61 and 52 Ma (chrons A26 to A23) due to the interaction between the conjugate crusts of the CIR and SEIR during the Indo-Eurasian collision.…”

Section: Physiographic Featuresmentioning

confidence: 98%

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A Comprehensive View of Manganese Nodules and Volcanics of the Central Indian Ocean Basin

Jauhari

Iyer

2008

Marine Georesources & Geotechnology

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Section: Physiographic Featuresmentioning

confidence: 92%

Section: The Volcanics: Types Occurrence Descriptionsmentioning

confidence: 98%

Section: Physiographic Featuresmentioning

confidence: 98%

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A Comprehensive View of Manganese Nodules and Volcanics of the Central Indian Ocean Basin

Jauhari

Iyer

2008

Marine Georesources & Geotechnology

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“…They classified these features as seamounts, hills, knolls, plateaus and guyots. Similarly, Das et al (2005) identified several seamounts located in the Central Indian Basin region of latitudes 9°S to 16°S and longitudes 72°E to 80°E.…”

Section: Seamountsmentioning

confidence: 93%

Structure and tectonics of the continental margins of India and the adjacent deep ocean basins: current status of knowledge and some unresolved problems

Yatheesh

2020

Episodes

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March 2020 586 The Indian Ocean and the bordering continental margins are characterized by a number of tectonic features consisting of deep ocean basins, aseismic ridges/ submarine plateaus and seamounts. Marine geophysical studies carried out over these regions for the past four decades have led to an increased understanding of the formation and evolution of these features. The present paper synthesizes an up-to-date compilation of the results of the salient inferences of those studies to describe the structure and tectonic evolution of these features as well as the Indian Ocean in general. A review of the existing knowledge on the structure and tectonics of the continental margins of India and the adjacent ocean basins reveal the existence of several unresolved problems, primarily due to the inherent tectonic complexities or the paucity of adequate data. Some of the major problems that need to be addressed/examined are: the existence and extent of the Prathap and Kori-Comorin ridges; the locations of the continent-ocean boundaries around the continental margins of India; the timing of formation of the deep offshore regions adjacent to the Indian continental margins; the deeper crustal structure and trend of the 85°E Ridge; the crustal configuration as well as the extent of the postulated micro-continental slivers; and the cause of intense seismicity over the Chagos Bank segment of the Laccadive-Chagos Ridge. In addition to addressing these questions, the present paper suggests ways to go forward by acquiring high-resolution and deep penetration multichannel seismic reflection data, seismic refraction data using Ocean Bottom Seismometers (OBS) and closely spaced sea-surface and deep-tow magnetic profiles along with high-resolution seafloor mapping.

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“…Although there are several reports on the occurrence of hydrothermal activity at the intra‐plate seamounts in the Pacific Ocean such as Macdonald, Loihi [ Karl et al , 1988], Vailulu’u (Samoan Hotspot related) [ Staudigel et al , 2004], signatures of hydrothermal mineralization have been reported in only one intra‐plate seamount area in the Indian Ocean [ Iyer et al , 1997]. This is despite the fact that a number of seamounts and abyssal hills are known to exist in the Indian Ocean [ Das et al , 2005; Kamesh Raju , 1993; Mukhopadhyay and Khadge , 1990]. Deep‐sea hydrothermal venting may provide an important source of trace elements to the ocean water [ von Damm et al , 1985] and thereby needs to be considered.…”

Section: Introductionmentioning

confidence: 99%

²¹⁰Pb, ²³⁰Th, and ¹⁰Be in Central Indian Basin seamount sediments: Signatures of degassing and hydrothermal alteration of recent origin

Nath¹,

Borole²,

Aldahan³

et al. 2008

Geophysical Research Letters

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Isotopic (210Pb, 238U‐230Th, 10Be), major and trace elements, and micromorphological and microchemical data, were used to identify recent (∼100 yrs) hydrothermal alteration of a >200 kyr sedimentary record from the flank of a seamount in the Central Indian Basin located at the edge of the 75°30′E fracture zone. Alteration effects are also reflected in 1) the depleted sedimentary organic carbon, 2) dissolution features of radiolarian skeletons, 3) the presence of altered minerals such as smectite and zeolites, and 4) distinctly different magnetic properties in the altered sediments. We interpret a predominant influence of neutral chloride type hydrothermal fluids. This is the first report of recently occurring sediment alteration by shallow circulating sub‐surface fluids along the Indian Ocean intra‐plate seamount environment.

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Distribution and Origin of Seamounts in the Central Indian Ocean Basin

Cited by 22 publications

References 28 publications

A Comprehensive View of Manganese Nodules and Volcanics of the Central Indian Ocean Basin

A Comprehensive View of Manganese Nodules and Volcanics of the Central Indian Ocean Basin

Structure and tectonics of the continental margins of India and the adjacent deep ocean basins: current status of knowledge and some unresolved problems

²¹⁰Pb, ²³⁰Th, and ¹⁰Be in Central Indian Basin seamount sediments: Signatures of degassing and hydrothermal alteration of recent origin

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Distribution and Origin of Seamounts in the Central Indian Ocean Basin

Cited by 22 publications

References 28 publications

A Comprehensive View of Manganese Nodules and Volcanics of the Central Indian Ocean Basin

A Comprehensive View of Manganese Nodules and Volcanics of the Central Indian Ocean Basin

Structure and tectonics of the continental margins of India and the adjacent deep ocean basins: current status of knowledge and some unresolved problems

210Pb, 230Th, and 10Be in Central Indian Basin seamount sediments: Signatures of degassing and hydrothermal alteration of recent origin

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²¹⁰Pb, ²³⁰Th, and ¹⁰Be in Central Indian Basin seamount sediments: Signatures of degassing and hydrothermal alteration of recent origin