Re-interpretation of the age and environment of deposition of Paleogene turbidites in the Andaman and Nicobar Islands, Western Sunda Arc

Bandopadhyay, P.C.

doi:10.1016/j.jseaes.2011.08.018

Cited by 31 publications

(13 citation statements)

References 32 publications

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“…Late Paleocene patch reefs interstratified with volcaniclastic sandstones have been identified on the Rampur coast of Middle Andaman Island (Bandopadhyay 2012, fig. 8b), and similar-aged limestone deposits interpreted as bioherm and biostroms are found at Tugapur of Middle Andaman (Ray 1982).…”

Section: Coral and Coral Reefsmentioning

confidence: 99%

Chapter 2 Introduction to the geography and geomorphology of the Andaman–Nicobar Islands

Bandopadhyay

Carter

2017

Memoirs

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Section: Coral and Coral Reefsmentioning

confidence: 99%

Chapter 2 Introduction to the geography and geomorphology of the Andaman–Nicobar Islands

Bandopadhyay

Carter

2017

Memoirs

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“…The Ophiolite Group of rocks lies tectonically above the Mithakhari Group with a thrust contact. The details of the individual lithostratigraphic units including their tectonic settings have been described vividly in recent literatures [Bandopadhyay, 2012;Ghosh et al, 2013].…”

Section: Brief Geological Overviewmentioning

confidence: 99%

“…-Outline geological map showing distribution of different lithostratigraphic units along and across the Andaman islands [modified fromBandopadhyay, 2012]. Inset shows major tectonic features of the IndonesiaSumatra-Java arc.…”

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confidence: 99%

Podiform chromitites in lherzolitic mantle rocks (Andaman ophiolite, India): the role of magma/rock interaction and parental melt composition

Ghosh

Bhatta

2014

Bulletin De La Société Géologique De France

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In this study, Alpine-type (ophiolite hosted) podiform chromitites from the lherzolite dominant mantle sequence of the Andaman ophiolite, India are described. The mantle host rocks for the chromitite pods show features of melt-mantle interaction. The chromites of the podiform chromitites have high-Cr# (= Cr/[Cr + Al] atomic ratio) ranging between 0.69 and 0.75 and high-Mg# (= Mg/[Mg + Fe 2+ ] atomic ratio) ranging between 0.58 and 0.72. Geochemically, the chromites of these high-Cr chromitites have an arc-spinel trend and suggest a supra-subduction zone setting. Contrarily, the low-Cr chromitites (reported elsewhere) show MORB-spinel trend. Parent melt composition is assessed on the basis of liquidus chromite compositions using various methods. The deduced composition shows that the melt parental to the high-Cr chromitite of the Andaman ophiolite had 12-13 wt.% Al 2 O 3 and 0.2-0.5 wt.% TiO 2 whereas the same for the low-Cr chromitites had~16 wt.% Al 2 O 3 and 0.5-0.9 wt.% TiO 2 . A correlation of the deduced parent melt compositions with the volcanic rocks of the Andaman ophiolite suggests a close affinity with the East Coast volcanics (south-Andaman) for the high-Cr chromitites. Contrarily, a similar correlation for the low-Cr chromitites is not so certain. Chromitites podiformes dans les roches manteliques lherzolitiques (ophiolite d'Andaman, Inde) : le rôle de l'interaction magma/roche et de la composition du liquide parentalMots-clés. -Chromite podiforme, Ophiolite d'Andaman, Liquide parental, volcanites de la Côte Est.Résumé. -Dans cette étude, des corps de chromite podiforme de type alpin (ophiolite hébergé), affleurant dans la sé-quence mantelique à dominante lherzolitique de l'ophiolite d'Andaman (Inde), sont décrits. Les péridotites encaissant les corps de chromite présentent des traces d'interaction liquide/roche. Les spinelles chromifères de ces chromites podiformes présentent des Cr# (=Cr[Cr + Al], rapport atomique) et des Mg# (=Mg/[Mg + Fe 2+ ], rapport atomique) élevés allant de 0.69 à 0.75 et de 0.58 à 0.72, respectivement. Géochimiquement, les spinelles chromifères de ces chromites à Cr# élevé décrivent une tendance charactéristique des spinelles de type "arc" suggérant un contexte géotectonique de subduction. Inversement, ceux des chromites à faible Cr# (signalés ailleurs) témoignent d'une affinité avec les MORBs. La composition du liquide parental est déduite sur la base de celles des spinelles chromifères au liquidus, en utilisant différentes méthodes. Celle-ci révèle que le liquide parental des chromites à Cr# élevé de l'ophiolite d'Andaman contenait 12-13 wt.% Al 2 O 3 et 0.2-0.5 wt.% TiO 2 , alors que celui des chromites à faible Cr# contenait~16 wt.% Al 2 O 3 et 0.5-0.9 wt.% TiO 2 . Une corrélation entre les compositions du liquide parental, ainsi déduites, et les volcanites de l'ophiolite d'Andaman suggèrent une étroite affinité entre les chromites à Cr# élevé et les volcanites sur la côte Est (sud-Andaman). Cependant, une pareille corrélation avec les chromites à faible Cr# semble uncert...

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“…1), generation of a plate sliver called the Burma microplate, transtension and formation of a back arc, pullapart extensional basin (Andaman Sea) with active sea floor spreading forming during the last 4-5 Ma (Raju, 2005;Curray, 2005). The Burma microplate includes the currently erupting Barren Island and, to the west, the islands of Andaman-Nicobar Ridge that expose deep sea turbidites formed in a submarine fan, dismembered ophiolites and sedimentary mélanges of a subduction-accretion complex (Bandopadhyay, 2005(Bandopadhyay, , 2012.…”

Section: Tectonic Settingmentioning

confidence: 99%

A reappraisal of the eruptive history and recent (1991-2009) volcanic eruptions of the Barren Island, Andaman Sea

2014

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Re-interpretation of the age and environment of deposition of Paleogene turbidites in the Andaman and Nicobar Islands, Western Sunda Arc

Cited by 31 publications

References 32 publications

Chapter 2 Introduction to the geography and geomorphology of the Andaman–Nicobar Islands

Chapter 2 Introduction to the geography and geomorphology of the Andaman–Nicobar Islands

Podiform chromitites in lherzolitic mantle rocks (Andaman ophiolite, India): the role of magma/rock interaction and parental melt composition

A reappraisal of the eruptive history and recent (1991-2009) volcanic eruptions of the Barren Island, Andaman Sea

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