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Geological framework of the Andaman–Nicobar Islands
P. C. Bandopadhyay,Andrew Carter +1 more
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The Andaman accretionary ridge as discussed by the authors consists of two stratigraphically and structurally distinct terranes, juxtaposed and telescoped into a north-south-trending high-relief fold-thrust belt formed along the obliquely subducting eastern margin of the Indo-Australian oceanic lithospheric plate.Abstract:
The Andaman–Nicobar archipelago that forms the western margin of the Andaman Sea is a sediment-dominated accretionary wedge (outer-arc island) associated with a convergent margin tectonic setting. The Andaman accretionary ridge consists of two stratigraphically and structurally distinct terranes, juxtaposed and telescoped into a north–south-trending high-relief fold-thrust belt formed along the obliquely subducting eastern margin of the Indo-Australian oceanic lithospheric plate. The geology and structure of the ridge reflect the complexity of the evolving tectonics and stratigraphy of an accretionary wedge. Pre-Cretaceous meta-sedimentary rocks, Upper Cretaceous ophiolites and Palaeogene–Neogene sedimentary formations indicate rapid, spatial and temporal changes in lithology, sedimentology, sedimentary and tectonic environments, and palaeogeographic setting. This chapter outlines the current geodynamic setting, evidence for the history of accretion and regional geology and introduces the regional stratigraphic framework.read more
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Impact of the Indian Summer Monsoon variability on the source area weathering in the Indo-Burman ranges during the last 21-kyr - A sediment record from the Andaman Sea
Tyson Sebastian,B. Nagender Nath,M. Venkateshwarlu,Pavan Miriyala,Archana Prakash,P. Linsy,M. Kocherla,Armoury Kazip,A.V. Sijinkumar +8 more
TL;DR: In this article, the authors investigated the role of the Indian Summer Monsoon (ISM) on the weathering patterns in the source regions of the Andaman Sea using environmental magnetic, clay mineralogical and geochemical techniques.
Journal ArticleDOI
Tectonic, diapiric and sedimentary chaotic rocks of the Rakhine coast, western Myanmar
Gregory F. Moore,Lin Thu Aung,Rina Fukuchi,James C. Sample,Eric Hellebrand,Achim J Kopf,Win Naing,Win Min Than,Tin Naing Tun +8 more
TL;DR: The western margin of Myanmar is the northern extension of the active Sunda (India-Eurasia) subduction zone as mentioned in this paper, and the sedimentary and tectonic shear zones contain fragments of Cretaceous ophiolites (chrome-spinel-bearing peridotites and radiolarian cherts).
Journal ArticleDOI
Integrated approaches to identifying cryptic bat species in areas of high endemism: The case of Rhinolophus andamanensis in the Andaman Islands.
TL;DR: In this article, the authors used morphometric, acoustic, and molecular phylogenetic data to show that a horseshoe bat in the Andaman Islands is distinct in all three aspects, supporting its status as a distinct species.
Journal ArticleDOI
Biomass and vegetation carbon stock in mangrove forests of the Andaman Islands, India
P. Ragavan,Sanjeev Kumar,Kandasamy Kathiresan,P. M. Mohan,R. S. C. Jayaraj,K. Ravichandaran,Tikam Singh Rana +6 more
TL;DR: In this article, the authors estimated plant biomass in mangrove forests of the Andaman Islands, India and found that the mean above-ground biomass was 469.20mg/ha (Mg ha−1), while the mean below-ground vegetation carbon stock was 166.78mg/(Mg −1)
References
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Marine gravity anomaly from Geosat and ERS 1 satellite altimetry
TL;DR: In this article, a combination of high-density data from the dense mapping phases of Geosat and ERS 1 along with lower-density but higher-accuracy profiles from their repeat orbit phases is used to construct gravity anomalies from the two vertical deflection grids.
Journal ArticleDOI
Global continental and ocean basin reconstructions since 200 Ma
Maria Seton,Ralph Müller,Sabin Zahirovic,Carmen Gaina,Trond H. Torsvik,Grace E. Shephard,A.S. Talsma,Michael Gurnis,M. Turner,Stefan Maus,Michael T. Chandler +10 more
TL;DR: In this paper, a new type of global plate motion model consisting of a set of continuously-closing topological plate polygons with associated plate boundaries and plate velocities since the break-up of the supercontinent Pangea is presented.
Journal ArticleDOI
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William B. F. Ryan,Suzanne M. Carbotte,Justin O. Coplan,Justin O. Coplan,S. O'Hara,Andrew Melkonian,Robert Arko,Rose Anne Weissel,Vicki Lynn Ferrini,A. M. Goodwillie,Frank O. Nitsche,Juliet Bonczkowski,Richard Zemsky +12 more
TL;DR: The Global Multi-Resolution Topography (GMRT) as discussed by the authors is a collection of bathymetry tiles with digital elevations and shaded relief imagery spanning nine magnification doublings from pole to pole.
Book
Volcanoes of the World
TL;DR: In this paper, the authors present a Chronology of large-volume Holocene Eruptions Fatalities and Evacuations Preliminary List of Pleistocene Volcanoes Preliminary list of Large-Volume Pleistogenic Eruption Gazetteer References VOLCANO DATA Volcano Name Subregion Latitude and Longitude Elevation Population Rock Type Type (Morphology) Volcano Number Status ERUPTION DATA Area of Activity Dates: Start and Stop Uncertainties Dating Techniques Duration Eruptive Characteristics Volcanic Explosivity Index (VEI) Volume of Products (Vol
Journal ArticleDOI
Controls on tectonic accretion versus erosion in subduction zones: Implications for the origin and recycling of the continental crust
Peter D. Clift,Paola Vannucchi +1 more
TL;DR: In this paper, the mass flux through convergent plate margins is documented to the understanding of petrogenesis in arc settings and to the origin of the continental crust, since subduction zones are the only major routes by which material extracted from the mantle can be returned to great depths within the Earth.