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Journal ArticleDOI

The Archipelago Group: current understanding

01 Jan 2017-Geological Society, London, Memoirs (Geological Society of London)-Vol. 47, Iss: 1, pp 153-166
TL;DR: The geology and stratigraphy of the Archipelago Group are reviewed and new data presented to improve understanding in this article, where the Neogene sequences were deposited in wave-and current-agitated shallow-marine intertidal and relatively deeper-water subtidal, nearshore and offshore shelfal environments.
Abstract: The geology and stratigraphy of the Archipelago Group are reviewed and new data presented to improve understanding. Major lithofacies are bioclastic limestones, bioturbated mottled marlstones, micritic limestones, trace fossil-bearing mudstones, quartzose sandstones and reworked volcanic material of Mio-Pliocene and Pleistocene age. The succession overlies the Pre-Neogene submarine fan turbidites and tectonic melanges of ophiolite derivation and Mithakhari rocks, and is overlain by Quaternary deposits of late Pleistocene–Holocene age. The Neogene sequences were deposited in wave- and current-agitated shallow-marine intertidal and relatively deeper-water subtidal, nearshore and offshore shelfal environments. The existing stratigraphic framework is examined and suggestions made for improvement.
Citations
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Journal Article

490 citations

Journal ArticleDOI
TL;DR: In this article, the authors examined the history and distribution of seismicity across the Andaman-Nicobar island arc and Andaman Sea and found that seismic deformation varied along strike from uniform dip-slip on the southern (Sumatran) segment to dipslip and strike-slink components on the andaman and Nicobar segment.
Abstract: This chapter examines the history and distribution of seismicity across the Andaman–Nicobar island arc and Andaman Sea. Fundamental differences between the Andaman section of the subduction zone and the Sumatra–Java section to the south help to explain the nature of the deformation. Magnitudes of displacements varied along-strike from uniform dip-slip on the southern (Sumatran) segment to dip-slip and strike-slip components on the Andaman and Nicobar segment. The Andaman section has a more steeply dipping slab and a thicker sediment cover compared to the Sumatra region where coupling with the overlying plate is stronger. Temporal and spatial patterns of seismicity in the Andaman Sea spreading centre are consistent with normal faulting and c. 25 year cycles of dyke injection are considered responsible for the bulk of the spreading.

4 citations

Journal ArticleDOI
TL;DR: In this paper , the authors studied the provenance of clastic sediments of the Andaman-Nicobar accretionary ridge using petrography, geochemistry, and detrital zircon geochronology.

1 citations

References
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01 Jan 1969

1,375 citations


"The Archipelago Group: current unde..." refers background in this paper

  • ...plesiotumida diagnostic of the late Miocene Zone 17 of Blow (1969) and Zone 17A of Srinivasan & Kennett (1983)....

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  • ...…acquilateralis, Globigerinita glutinata, Globoquadrina altispira, G. conglomerate, Globorotalia cibaoensis, G. menardii, G. obesa, G. cf. scitulla, G. (Tenuitella) anfracta and G. plesiotumida diagnostic of the late Miocene Zone 17 of Blow (1969) and Zone 17A of Srinivasan & Kennett (1983)....

    [...]

Book
01 Jan 2001
TL;DR: In this article, the authors introduce basic concepts and methodologies for the analysis of Siliciclastic Sediments, including Sandstones, Conglomerates and Breccias.
Abstract: Preface to the third edition Preface to the second edition Preface to the first edition 1. Introduction: Basic Concepts And Methodology2. Siliciclastic Sediments I: Sandstones, Conglomerates And Breccias3. Siliciclastic Sediments II: Mudrocks4. Limestones5. Evaporites6. Sedimentary Ironstones And Iron-Formations7. Sedimentary Phosphate Deposits8. Coal, Oil Shale And Petroleum9. Cherts And Siliceous Sediments10. Volcaniclastic Sediments References Index Colour plates fall between p. 118 and p. 119

686 citations


"The Archipelago Group: current unde..." refers background in this paper

  • ...The limestone bed surfaces show full preservation of nereites that has an ichnofacies characteristic of quiet, well-oxygenated settings such as bathyal to abyssal environments (Tucker 2001) (Fig....

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Book
01 Dec 1986

621 citations

Journal ArticleDOI
TL;DR: The Andaman Sea is an active backarc basin lying above and behind the Sunda subduction zone where convergence between the overriding Southeast Asian plate and the subducting Australian plate is highly oblique.

530 citations


"The Archipelago Group: current unde..." refers background in this paper

  • ...Curray (2005) suggested that the shallow-water Neogene sequences were deposited on the top of the Andaman–Nicobar Ridge while the relatively deeper-water facies formed on the flank of the ridge....

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  • ...Bandyopadhyaya et al. (1973) suggested that the entire Archipelago Group was deposited under shallow-marine conditions, reinforced by Curray (2005)....

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Journal Article

490 citations


"The Archipelago Group: current unde..." refers background in this paper

  • ...Chalk is a fine-grained limestone composed largely of coccoliths and associated with deep-marine conditions (Pettijohn et al. 1987)....

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