The ocean floor morphostructure of the Bay of Bengal (Indian Ocean) and the problem of its originстатья
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Дата последнего поиска статьи во внешних источниках: 18 марта 2020 г.
Аннотация:This study is based on the geological and geophysical data obtained in the Bay of Bengal and adja cent part of the Central Indian 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 dryland area—the Bengal elevation—existed in the Cretaceous at the location of the presentday Bay of Bengal. During the Cretaceous, the geological evolution of this area was controlled by epicontinental sedi mentation 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 differen tiated tectonic movements in the southern part of the basin. As a result, the basement experienced fragmen tation 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.