scholarly journals Back-arc basin origin for the basalts of the South Andaman Island Ophiolite (India)

Episodes ◽  
2021 ◽  
Author(s):  
by Salim Akhtar ◽  
Ashima Saikia ◽  
Priyanka Negi ◽  
Bikas Jyoti Kalita
Keyword(s):  
The South ◽  
Andaman Island ◽  
South Andaman ◽  
Back Arc

scholarly journals Cumulate gabbros in the South Andaman Island Ophiolite Suite (India): their bearing on the tectonic setting.

2021 ◽  
Author(s):  
Salim Akhtar ◽  
Priyanka Negi ◽  
Ashima Saikia
Keyword(s):  
Trace Element ◽  
Tectonic Setting ◽  
The South ◽  
Andaman Island ◽  
Ophiolite Suite ◽  
South Andaman ◽  
Major Oxide ◽  
Mineral Compositions ◽  
Arc Setting ◽  
Back Arc

The Andaman Ophiolite of south-eastern India is located on the outer arc of the Andaman-Java subduction zone. It is represented by thrust slices formed in the Mesozoic Neo-Tethyan Ocean. Lithologically, it consists of dismembered mafic and ultramafic rocks and associated oceanic pelagic sediments. The present study focuses on the mafic cumulate rocks of the Andaman Ophiolite preserved in the Kodiaghat and the Mundapahar area of the South Andaman Island. The mafic cumulates are represented by olivine-bearing and olivine-free gabbros. The sequence of crystallisation in the gabbros is olivines (Fo~80) ± chromian spinels (Cr# 59 - 57), plagioclases (An95−61), clinopyroxenes (Mg# = 89 - 82) and amphiboles (Mg-hornblende, edenite and pargasite). Major oxide and trace element whole rock geochemistry and mineral compositions are consistent with a hybrid signature of Island Arc Tholeiite (IAT) - Mid Oceanic Ridge Basalt (MORB). Geochemical modelling shows that trapped melt fractions of 0 – 20 % can produce the observed trace element signatures of these gabbros. Our findings suggest that the gabbroic cumulates of the Andaman ophiolite were formed in an oceanic back-arc and oceanic arc setting developed in the Neo-Tethyan oceanic domain between the Indian and the Burmese plates during Late Cretaceous age.

Changing trend in the seroprevalence and risk factors of human leptospirosis in the South Andaman Island, India

2018 ◽  
Vol 65 (6) ◽  
pp. 683-689 ◽  
Author(s):  
Ratchagadasse Vimal Raj ◽  
Kirubakaran Vinod Kumar ◽  
Chandan Lall ◽  
Kumaresan Vedhagiri ◽  
Attayur Purushothaman Sugunan ◽  
...  
Keyword(s):  
Risk Factors ◽  
The South ◽  
Andaman Island ◽  
Human Leptospirosis ◽  
Changing Trend ◽  
South Andaman

An Integrated Study for the Assessment of Tsunami Impacts: A Case Study of South Andaman Island, India Using Remote Sensing and GIS

2007 ◽  
Vol 49 (3) ◽  
pp. 229-266 ◽  
Author(s):  
K. Dharanirajan ◽  
P. Kasinatha Pandian ◽  
B. Gurugnanam ◽  
RM. Narayanan ◽  
S. Ramachandran
Keyword(s):  
Remote Sensing ◽  
Remote Sensing And Gis ◽  
Andaman Island ◽  
South Andaman ◽  
Integrated Study

Merremia umbellata ssp. orientalis (Hallier f.) Ooststr. - A New Addition to Indian Convolvulaceae from Andaman Islands, India

2019 ◽  
Vol 42 (2) ◽  
pp. 119-122
Author(s):  
Lal Ji Singh ◽  
◽  
Mudavath Chennakesavulu Naik ◽  
Keyword(s):  
Andaman Islands ◽  
The South ◽  
Flora Of India ◽  
South Andaman

Merremia umbellata subsp. Orientalis (Hallier f.) Ooststr. is reported as new distributional record for the flora of India from the South Andaman Islands. Updated nomenclature, brief description, phenology, distribution along with field photographs and illustrations are provided.

Palynodiversity in the Climbers of Andaman Islands, India

2016 ◽  
Vol 39 (2) ◽  
pp. 125-131
Author(s):  
Mudavath Naik ◽  
J. Kailas ◽  
H. Ramakrishna ◽  
Boyina Rao
Keyword(s):  
Morphological Characters ◽  
Andaman Islands ◽  
Andaman Island ◽  
South Andaman

The present investigation deals with the study of pollen diversity of forty one climbers of forests in South Andaman Island. These 41 taxa belong to diversified families viz. Acanthaceae, Apocynaceae, Asteraceae, Capparaceae, Combretaceae, Convolvulaceae, Cucurbitaceae, Euphorbiaceae, Fabaceae, Hernandiaceae, Lauraceae, Passifloraceae, Polygonaceae, Malvaceae, Rhamnaceae, Rubiaceae and Sapindaceae. The pollen of these taxaare diversified in morphological characters viz., symmetry, shape, polarity, apertural pattern and ornamentation.

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