Submarine fan deposits: petrography and geochemistry of the Andaman Flysch
P. C. Bandopadhyay, A. Carter, 2017. "Submarine fan deposits: petrography and geochemistry of the Andaman Flysch", The Andaman–Nicobar Accretionary Ridge: Geology, Tectonics and Hazards, P. C. Bandopadhyay, A. Carter
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The Andaman Flysch of Oligocene age comprises basinal-scale deposits of marine turbidites from an axially fed submarine fan. It is intermittently exposed across the entire chain of the Andaman–Nicobar Islands from the northernmost tip of North Andaman to the southernmost part of Great Nicobar. This chapter reviews the field and petrographic attributes, heavy mineral assemblages, major and trace elements, and isotope geochemistry of the most accessible outcrops on the main Andaman islands.
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The Andaman–Nicobar Accretionary Ridge: Geology, Tectonics and Hazards
Rocks exposed across the hundreds of islands that belong to the 800 km long Andaman–Nicobar archipelago provide a condensed window into the active subduction zone that separates the India–Australia plate from the over-riding Burma–Sunda plate. Despite a strategic and seismically active location the Andaman-Nicobar ridge has seen comparatively little research. This Memoir provides the first detailed and comprehensive account of geological mapping and research across the island chain and adjacent ocean basins. Chapters examine models of Cenozoic rifting of the Andaman Sea and the regional tectonic and seismogenic framework. A detailed critical review of the Andaman–Nicobar stratigraphy, supported by new data, includes arc volcanism and a description of Barren Island, India’s only active volcano. Seismic history and hazards and the impacts of the 2004 earthquake and tsunami are also described. The volume ends with an examination of the region’s natural resources and hydrocarbon prospects.