Greenschist-facies sub-ophiolitic metamorphic rocks of Andaman Islands, Burma–Java subduction complex

Pal, T. K.; Bhattacharya, Anupam

doi:10.1016/j.jseaes.2010.05.017

Cited by 22 publications

(14 citation statements)

References 37 publications

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“…Fragments of ophiolites in accretionary prisms are found in other regions as well (e.g. Pal and Bhattacharya, 2010). However, as reported in recent studies, the Volga-Uralia segment rocks of the East European Craton served as a source area for the Vorontsovka series (Savko et al, 2011).…”

Section: Tectonic (?) Nature Of Metabasitementioning

confidence: 81%

“…2104-2240 Ma; Terentiev and Santosh, 2016) and ε Nd values in the range of 5.2 to 1.7 (Shchipansky et al, 2007) suggest that these were sourced from the juvenile Volga-Uralia Palaeoproterozoic region (Savko et al, 2011). Pal and Bhattacharya, 2010). Terentiev, 2015), based on the analysis of the metamorphosed xenoliths in the Novaya Melovatka intrusion, as well as from mafic rocks of the Elan complex of the Voronezh Crystalline Massif.…”

Section: Tectonic (?) Nature Of Metabasitementioning

confidence: 99%

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Clinopyroxenites (diopsidites) and metabasites from the East Sarmatian Orogen, East European Craton

Terentiev

Santosh

2016

Geol. J.

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The East Sarmatian Orogen was built through successive subduction and collision processes at the junction of the Sarmatia and Volga‐Uralia segments of the East European Craton. In this paper we present petrological and geochemical characteristics of diopsidites and host amphibolites from the central part of this orogen. We report a new occurrence of metabasites (meta‐gabbros and amphibolites) and anorthite–bytownite‐bearing diopsidites from the Palaeoproterozoic Vorontsovka terrane of the East Sarmatian Orogen. The diopsidites occur as networks of veinlets and dykes within the metabasite layers (thickness up to 100 m) and are composed predominantly of high‐Mg diopside (Mg# up to 0.87) and calcic plagioclase (An99–73) with traces of K‐feldspar, titanite, calcite, quartz with retrograde chlorite and epidote. The diopsidites are low in Ti and K and high in Mg (Mg# greater than 0.82) rocks. They have low REE; positive Ce, U and Sr anomalies; and negative Th, Nb and Ti anomalies. The meta‐gabbros and amphibolites are composed of calcic amphibole, albite, quartz, biotite, zoisite, prehnite and ore minerals (sulphides + ilmenite). The amphibolites are low Al, low K, magnesian–ferroan (Mg# = 0.46–0.75) and medium Ti (TiO2 0.75–1.37 wt.%) (SiO2 40.1–47.3 wt.%). The meta‐gabbros exhibit slight LREE and LILE enrichment, particularly in Rb, Ba and Sr. The amphibolites are tholeiitic in composition and have N‐MORB‐like REE and HFSE features, with high 143Nd/144Nd (0.512736) and positive εNd(T) (6.0). The diopsidites reported in our study compare with convergent‐margin rocks formed via metasomatic processes associated with slab subduction. The metabasite protoliths represent oceanic crust with N‐MORB‐type features with the LILE enrichment accompanying the subduction zone process. Copyright © 2016 John Wiley & Sons, Ltd.

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Section: Tectonic (?) Nature Of Metabasitementioning

confidence: 81%

Section: Tectonic (?) Nature Of Metabasitementioning

confidence: 99%

Clinopyroxenites (diopsidites) and metabasites from the East Sarmatian Orogen, East European Craton

Terentiev

Santosh

2016

Geol. J.

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“…Finally, the peridotites on Middle and North Andaman are underlain by a serpentinite-hosted melange that contains metavolcanic rocks and metacherts with greenschist facies to amphibolite-facies metamorphic grade attributed to a dismembered metamorphic sole (Pal and Bhattacharya 2010).…”

Section: Contrasting Mantle Rocksmentioning

confidence: 99%

“…In absence of such age constraints, we do not know the true age of subduction initiation. One way forward is studying the sub-ophiolitic metamorphic rocks identified by Pal and Bhattacharya (2010). Do these have mid-pressure and high-temperature metamorphic paragenesis typical of metamorphic soles (e.g., Agard et al 2016)?…”

Section: Respectively?mentioning

confidence: 99%

Andaman Ophiolite: An Overview

Bandyopadhyay

Hinsbergen

Plunder

et al. 2020

Society of Earth Scientists Series

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HAL is a multidisciplinary open access archive for the deposit and dissemination of scientific research documents, whether they are published or not. The documents may come from teaching and research institutions in France or abroad, or from public or private research centers. L'archive ouverte pluridisciplinaire HAL, est destinée au dépôt et à la diffusion de documents scientifiques de niveau recherche, publiés ou non, émanant des établissements d'enseignement et de recherche français ou étrangers, des laboratoires publics ou privés.

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“…Eruptive styles of volcanoes from Barren Islands have been studied by Alam et al (2004) and Sheth et al (2009). Block and ash flow deposits and dacite-andesites from Narcondam Island volcanoes have been documented by Pal et al (2007) and Pal and Bhattacharya (2011). Petrological and geochemical studies of lava flows and associated intrusive from Barren Island have characterized them as low-K basalts to basaltic andesites derived from an arc-related mantle source (Chandrasekharam et al, 2009).…”

Section: Figure 1 (A)map Showing the Location Of Study Area Along Wimentioning

confidence: 99%

Magma genesis at Andaman volcanic arc regime, Northeastern Indian Ocean: Role of slab-mantle interaction

2020

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323This study reports new petrological and geochemical data of submarine volcanic rocks dredged from the Andaman arc, northeastern Indian Ocean and evaluates their petrogenetic and tectonic implications. The studied samples exhibit wide range of compositions including basalts, andesites, dacites and rhyolites depicting BADR trend of magmatic differentiation. The basalts are porphyritic and composed of calcic plagioclase phenocrysts embedded in the groundmass consisting of plagioclase, clinopyroxene and volcanic glass. Andesite and dacites comprise clusters of plagioclase are phenocrysts embedded in glassy ground mass depicting glomeroporphyritic and vitrophyric textures. Plagioclase microlites in andesites show primary flow texture. Rhyolites from the study area porphyritic in nature predominantly consisting K-feldspar, quartz and plagioclase phenocrysts embedded in a silica rich merocrystalline groundmass of quartz, K-feldspar, biotite, opaque and glass. Plagioclase compositions in basalts and rhyolites correspond to An76-78 and An5-8 respectively. Geochemical and tectonic attributes marked by uniform LILE-LREE enriched, HFSE depleted trends corroborate (i) Mariana-type subduction of old, cold, thick and dense Indian Ocean lithosphere (ii) slabdehydration, variable slab-mantle interaction, metasomatism and flux melting of mantle wedge and (iii) magma underplating and melting of lower oceanic crust resulting into calc-alkaline magmatism of B-A-D-R compositional spectra.

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Greenschist-facies sub-ophiolitic metamorphic rocks of Andaman Islands, Burma–Java subduction complex

Cited by 22 publications

References 37 publications

Clinopyroxenites (diopsidites) and metabasites from the East Sarmatian Orogen, East European Craton

Clinopyroxenites (diopsidites) and metabasites from the East Sarmatian Orogen, East European Craton

Andaman Ophiolite: An Overview

Magma genesis at Andaman volcanic arc regime, Northeastern Indian Ocean: Role of slab-mantle interaction

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