Anatomy of a Forearc Submarine Fan: Upper Eocene — Oligocene Andaman Flysch Group, Andaman Islands, India

Chakraborty, Prithwish; Pal, T. K.

doi:10.1016/s1342-937x(05)70347-6

Cited by 45 publications

(38 citation statements)

References 11 publications

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“…For example, the Port Blair formation was redefined as the Andaman Flysch, and some other new formation names have been introduced. More recently, GSI geologists Chatterjee (1967Chatterjee ( , 1984, Parthasarathy (1984), Roy et al (1988), Bandopadhyay and Ghosh (1998), Acharyya et al (1990), Acharyya et al (1997Acharyya et al ( , 1998, Acharyya (1997), Chakraborty and Pal (2001) and Chakraborty et al (1999Chakraborty et al ( , 2002 have published excellent new descriptions and facies interpretations, some of which I will follow in the subsequent discussions.…”

Section: Outer Arc-andaman-nicobar Ridgementioning

confidence: 99%

Tectonics and history of the Andaman Sea region

Curray

2005

Journal of Asian Earth Sciences

553

522

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Section: Outer Arc-andaman-nicobar Ridgementioning

confidence: 99%

Tectonics and history of the Andaman Sea region

Curray

2005

Journal of Asian Earth Sciences

553

522

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“…It is c. 3 km thick, composed of three different lithofacies and overlies and onlaps the Mithakhari Group. The AFG is unconformably overlain by the AG, which are Miocene -Pliocene-aged sediments thought to have been deposited in an outer-shelf to open-marine environment (Chakraborty & Pal 2001). The AG is composed of two major assemblages of turbidites.…”

Section: The Andaman -Nicobar Forearc Basin Systemmentioning

confidence: 99%

Chapter 13 Anatomy of the Andaman–Nicobar subduction system from seismic reflection data

Singh¹,

Moeremans²

2017

Memoirs

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The Andaman–Nicobar subduction system is the northwestern segment of the Sunda subduction system, where the Indian Plate subducts beneath the Sunda Plate in a nearly arc-parallel direction. The entire segment ruptured during the 2004 great Andaman–Sumatra earthquake (Mw=9.3). Using recently acquired high-resolution seismic reflection data, we characterize the shallow structure of the whole Andaman–Nicobar subduction system from west to east, starting from the nature of the subducting plate in the Bay of Bengal to back-arc spreading in the Andaman Sea. We find that the Ninety-East Ridge is overlain by thick continental margin sediments beneath the recent Bengal Fan sediments. The boundary between these two sedimentary units defines the plate interface. We observe evidence of re-activation of fracture zones on the subducting plate beneath the forearc, influencing the morphology of the upper plate. The forearc region, which includes the accretionary wedge, the forearc high and the forearc basin, is exceptionally wide (250 km). We observe an unusually large bathymetric depression within the forearc high. The forearc high is bounded in the east by a normal fault, whereas the forearc basin contains an active backthrust. The forearc basin is floored by the continental crust of Malayan Peninsula origin. The active sliver strike-slip fault lies in a deep basin, created during the rifting of the forearc continental crust and the Malayan Peninsula. The sliver fault connects with the Great Sumatra Fault in the south and with the Sagaing Fault in the north, via the Andaman Sea spreading centre and a large transform fault in the Andaman Sea.

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“…The Oligocene Andaman Flysch, consisting of thick and extensive occurrences of greywacke sandstones, showing the profuse development of Bouma sequences, is interpreted as composed of turbidites formed in forearc submarine fans (Bandopadhyay and Ghosh, 1998a;Chakraborty and Pal, 2001).…”

Section: Introductionmentioning

confidence: 99%

Discovery of abundant pyroclasts in the Namunagarh Grit, South Andaman: evidence for arc volcanism and active subduction during the Palaeogene in the Andaman area

Bandopadhyay

2005

Journal of Asian Earth Sciences

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Anatomy of a Forearc Submarine Fan: Upper Eocene — Oligocene Andaman Flysch Group, Andaman Islands, India

Cited by 45 publications

References 11 publications

Tectonics and history of the Andaman Sea region

Tectonics and history of the Andaman Sea region

Chapter 13 Anatomy of the Andaman–Nicobar subduction system from seismic reflection data

Discovery of abundant pyroclasts in the Namunagarh Grit, South Andaman: evidence for arc volcanism and active subduction during the Palaeogene in the Andaman area

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