Debaditya BandyopadhyayAcademia Sinica · Institute of Earth Sciences
Debaditya Bandyopadhyay
Ph.D. in Geology, University of Calcutta
About
21
Publications
14,059
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212
Citations
Introduction
Skills and Expertise
Additional affiliations
July 2019 - June 2021
July 2021 - September 2022
Earthquake Research Institute, the University of Tokyo
Position
- Post-doctoral Fellow
February 2015 - January 2018
Education
August 2010 - August 2012
June 2007 - May 2010
Asutosh College
Field of study
- Geology
Publications
Publications (21)
We examined the composition and lithological variability from a road section in south-Andaman which represents a pathway to the crustal section of the Cretaceous Andaman ophiolite. Like other well-studied ophiolites worldwide this transition zone is marked by association of olivine-rich troctolite, wehrlite, pyroxenite and gabbroic rocks. The miner...
Igneous microtextures are significant tracers of magmatic processes as these provide important information about magma evolution. Oxy-symplectite intergrowth of orthopyroxene (host) with Fe-Ti oxide (lamellae) is described from the Atlantis Bank, an Oceanic Core Complex (OCC) along the ultraslow spreading Southwest Indian Ridge (SWIR). This texture...
This study aims to investigate the earliest imprint of Deccan rift magmatism as preserved in alkali basalts from the northwestern Indian shield. The alkali basalts are petrographically classified as nephelinites and basanites. They are silica undersaturated and their high Mg#, CaO/Al 2 O 3 , Cr and Ni indicate their primitive character. Geochemical...
Symplectitic intergrowth of orthopyroxene (host) with magnetite and minor ilmenite (lamellae) are recorded from Atlantis Bank, an Oceanic Core Complex on Southwest Indian Ridge. The texture is typically developed in oxide-rich gabbros recovered from the lower crustal section in this region and formed at the expense of olivine. Usually, the intergro...
The Meghalaya Gneissic Complex (MGC) of northeast India is a little-studied high-grade metamorphic terrain, located close to the Late Palaeoproterozoic to early Neoproterozoic orogenic front. We include mapping, petrography, mineral chemistry, geochemistry, phase equilibria modelling, and U-Th-total Pb monazite geochronology to investigate the evol...
Intracrystalline exsolution textures in alkali feldspar are common in lithotypes from many alkaline complexes of the Eastern
Ghats Granulite Belt (EGGB), India. However, the parentage of these textures and their compositional evolution is not
well documented from this granulite belt. This study on the Koraput Alkaline Complex (KAC) in the EGGB docu...
Owing to the lack of persistent magma chamber and the complex interplay between magmatism and tectonism at slow- to ultraslow-spreading ridges, the likeliness of fractional crystallization being the predominant process of evolution of crustal magmas is weak. Here, we report a detailed petro-geochemical investigation from the lower crustal gabbroic...
Although occurring as an accessory phase in mafic-ultramafic rocks, the universal presence of chrome spinel in ophiolitic settings bears importance in deciphering the tectonic setting of the ophiolite. Compositional and textural modification of chrome spinel via post-magmatic processes (metamorphism and fluid-induced alteration) is widely reported...
We report multistage geochemical evolution of off-cratonic subcontinental lithospheric mantle by studying mantle xenoliths hosted in alkali basalts from the northwestern part of the Deccan volcanic province in Kutch. The xenolithic fragments are peridotites, composed of Cr-rich diopside, Mg-rich olivine, orthopyroxene and aluminous spinel. Composit...
The Andaman and Nicobar ophiolites, in the forearc of the western Sunda subduction zone, underwent enigmatic, rapid Cenozoic vertical motions: shallow-water sediments with abundant arc debris characterize the middle Paleocene–middle Eocene and are under- and overlain by significantly deeper sediments. Recent paleomagnetic results revealed a near-eq...
Oxidation states within the planetary interior are intrinsically linked with the broad scale tectonism; however, it is difficult to estimate the actual oxidation conditions. Orthopyroxene-magnetite symplectite formed by olivine oxidation may provide a significant clue into such oxidation events. Here we report detailed mineralogical and petrologica...
Ophiolites are widely studied to unravel how new subduction zones form. They may contain crustal and mantle rocks that formed during juvenile stages of intra-oceanic subduction, modifying the pre-existing oceanic lithosphere within which subduction started, and in which a magmatic arc formed upon subduction maturation. Previous geochemical work on...
Subduction polarity reversal during arc‐continent collision has been proposed as a key mechanism to initiate new subduction zones. Despite often interpreted, well‐exposed geological record that document the reversal is sparse. The ophiolitic lithounits of the Andaman and Nicobar Islands have been proposed to have formed during the initiation of a n...
The Andaman Ophiolite remained little explored for long but recent studies yielded important first-order findings that hold promise for further research. Here we summarise these first-order constraints on the structure, geochemistry, and evolution of the Andaman Ophiolite and identify key frontiers for future research. The uniqueness of Andaman Oph...
Andaman subduction complex is thecentral part of 5000km long Burma-Java subduction complex where Indian plate is subducting obliquely below the Burma(Myanmar) microplate. The Andaman and Nicobar group of Islands represent the positive landform expression of the accretionary prism in outer arc and turbidites of fore arc setting, developed due to con...
Andaman–Nicobar Ophiolites (ANO) occur as discontinuous bodies along the eastern margin of the Andaman and
Nicobar Islands, the exposed parts of the outer-arc ridge of the present Sunda subduction system. The lithospheric architecture
starts with mantle rocks overlain by crustal rocks with a thin transition zone in between. The mantle peridotites a...
The onset of the end-Mesozoic continental rift magmatism in the Deccan volcanic province (DVP), India is marked by alkali magmatism. Lithospheric fragments occurring as xenoliths/xenocrysts entrapped in alkaline basalts from the Kutch area of the DVP preserve reaction microtextures giving an insight into the processes linked to their origin. We int...
Questions
Question (1)
On behalf of my lab-mate Soumi Chatterjee:
We are working on an alkali basalt sample, where we have documented some of this flower like aggregates of tiny euhedral to subhedral clinopyroxenes with minor amount of spinel occurring within fine grained basaltic matrix. EPMA indicates that they are Ti-rich Diopside. It would be extremely helpful if anybody can give some clue on their origin, textural significance etc. Moreover, any literature references would be highly appreciated. Attaching the corresponding photomicrograph as a Pdf file (see the attachment)
Fig Caption: Photomicrograph of the texture A) under Plane polarised light; B) under cross polars; C) Reflected light photograph; D) BSE image
