The ocean floor morphostructure of the Bay of Bengal (Indian Ocean) and the problem of its origin

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doi: 10.1134/S1069351316020063
Author(s): Illarionov, V. K.; Boyko, A. N.; Udintsev, G. B.
Author Affiliation(s): Primary:
Russian Academy of Sciences, Schmidt Institute of Physics of the Earth, Moscow, Russian Federation
Russian Academy of Sciences, Vernadsky Institute of Geochemistry and Analytical Chemistry, Russian Federation
Volume Title: Izvestiya - Russian Academy of Sciences. Physics of the Solid Earth
Source: Izvestiya - Russian Academy of Sciences. Physics of the Solid Earth, 52(3), p.382-398. Publisher: MAIK Nauka/Interperiodica, Birmingham, AL, United States. ISSN: 1069-3513
Note: In English. Original Russian text; Illarionov, V. K., Boyko, A. N., Udintsev, G. B., Fizika Zemli, No. 3, p. 50-67, 2016.. 53 refs.; illus., incl. sects., geol. sketch maps
Summary: This study is based on the geological and geophysical data obtained in the Bay of Bengal and adjacent part of the Mid-Indian Ocean Basin by different Russian scientific and industrial institutions in the 1980s and 1990s. The results of the more recent foreign investigations are also involved. The analysis of the collected data provided a new insight into the geological structure and evolution of the region indicating that a large dry-land area-the Bengal elevation-existed in the Cretaceous at the location of the present-day Bay of Bengal. During the Cretaceous, the geological evolution of this area was controlled by epicontinental sedimentation and active volcanism. In the Late Cretaceous, progressive submersion with the inception of the Central Basin took place in the region. The subsidence of the basement was accompanied by active differentiated tectonic movements in the southern part of the Bay of Bengal. As a result, the basement experienced fragmentation into blocks with the formation of horst and graben structures. The horst relics eventually submerged to the current depths in the Late Miocene-Pliocene. The maximal amplitude of basement submersion within the bay is more than 11 km. Copyright 2016 Pleiades Publishing, Ltd.
Year of Publication: 2016
Research Program: DSDP Deep Sea Drilling Project
ODP Ocean Drilling Program
Key Words: 07 Marine Geology and Oceanography; 20 Geophysics, Applied; Asia; Barisal High; Basement; Bathymetry; Bay of Bengal; Bengal Fan; Boreholes; Cenozoic; Central Basin; Continental crust; Cretaceous; Crust; DSDP Site 216; DSDP Site 217; Deep Sea Drilling Project; East Indian Ridge; Eighty Five East Ridge; Faults; Geophysical methods; Geophysical profiles; Geophysical surveys; Grabens; Horsts; India; Indian Ocean; Indian Peninsula; Leg 121; Leg 22; Lithostratigraphy; Mesozoic; Mid-ocean ridges; Miocene; Neogene; Ninetyeast Ridge; ODP Site 758; Ocean Drilling Program; Ocean floors; Plate tectonics; Pliocene; Reflection; Seismic methods; Seismic profiles; Sri Lanka; Subsidence; Surveys; Systems; Tertiary; Topography; Upper Miocene; Volcanism; Western Basin
Coordinates: N052302 N052303 E0902141 E0902140
N085534 N085535 E0903220 E0903219
Record ID: 2018007625
Copyright Information: GeoRef, Copyright 2019 American Geosciences Institute. Reference includes data supplied by Springer Verlag, Berlin, Federal Republic of Germany