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Internal structure of the 85°E ridge, Bay of Bengal: Evidence for multiphase volcanism

DRS at CSIR-National Institute of Oceanography

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Title Internal structure of the 85°E ridge, Bay of Bengal: Evidence for multiphase volcanism
 
Creator Ismaiel, M.
Krishna, K.S.
Srinivas, K.
Mishra, J.
Saha, D.
 
Subject Geology and geophysics
Geology and geophysics
Geology and geophysics
 
Description The 85°E Ridge, located in the Bay of Bengal of the northeastern Indian Ocean is an enigmatic geological feature as it possesses unusual geophysical signatures. The ridge's internal structure and mode of eruptions are unknown due to lack of deep seismic reflection and borehole data control. Here, we analyze 10 km of long-streamer seismic reflection data to unravel the ridge's internal structure, and thereby to enhance the understanding of how the ridge was originated and grew over a geologic time. Seismic facies analysis reveals the ridge structure consisting of volcanic vent and several stratigraphic units including packs of prograding clinoforms. The clinoform sequences are interpreted as volcanic successions, and led to the formation of lava-delta fronts. Interpreted features of lava-fed deltas and intervening erosional surfaces, and mass flows along ridge flanks suggest that the 85°E Ridge is a volcanic construct, and was built by both subaqueous and multiphase sub-marine volcanism during the Late Cretaceous (approximately from 85 to 80 Ma). At later time, from Oligocene-Miocene (~23 Ma) onwards the ridge was buried under the thick sediments of the Bengal Fan system.
 
Date 2017-03-01T09:38:58Z
2017-03-01T09:38:58Z
2017
 
Type Journal Article
 
Identifier Marine and Petroleum Geology, vol.80; 2017; 254-264
http://drs.nio.org/drs/handle/2264/5085
 
Language en
 
Rights An edited version of this paper was published by Elsevier. Copyright [2016] Elsevier
 
Publisher Elsevier