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  1. University of Yangon
  2. Department of Geology

1320525 Neogene Sedimentary Fringe, West of Indo-Burma Ranges in Western Myanmar: Some Evidences for Late Cenozoic Synorogenic Sedimentation in Himalayan-Bengal System

http://hdl.handle.net/20.500.12678/0000002682
http://hdl.handle.net/20.500.12678/0000002682
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2e7b8a2f-9471-44e3-b1b6-742d261355ba
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1320525Neogene 1320525Neogene Sedimentary Fringe (Extended Abstract for AAPG I.pdf (2233 Kb)
Publication type
Journal article
Upload type
Publication
Title
Title 1320525 Neogene Sedimentary Fringe, West of Indo-Burma Ranges in Western Myanmar: Some Evidences for Late Cenozoic Synorogenic Sedimentation in Himalayan-Bengal System
Language en
Publication date 2012
Authors
Kyi Khin
Sakai, Takashi
Description
The Arakan Basin is one of the representative clastic basins formed in the frontal part of the
Himalayan orogenic belt since the Late Cenozoic. Defining one of the four major sedimentary
basins of Myanmar, it is geomorphologically and tectonically differentiated from the others. The
study area along the westernmost edge of Myanmar is separated from the Arakan Yoma (Indo-
Burma Ranges) by a narrow coastal strip and is bordered by the Bay of Bengal to the west.
Regional stratigraphic correlation and the geological age of the siliciclastic sequences were
established, based on planktonic foraminifera zonation. Deep marine slope and shelf environments
during early Miocene to middle Miocene (about 21.5 to 11 Ma) southward prograded shelf-delta
environment during late Miocene to Pliocene time were determined.
The early Miocene underthrusting along the Himalaya front is well documented by the forcedregressive
sedimentation patterns in the slope and shelf systems, sediments of which derived from
the paleo-Ganges-Brahmaputra river systems in the Bengal-Arakan Basins. Sequential evolution of
the Miocene successions manifests in forced regressive wedged system tracts. These evolved
through slope by-passing and slumping and, following deep-marine channel in-filling, began to
accumulate an increased sediment load due to the rapid fall of the sea level by the uplifting in the
hinterlands during the early- to early-middle-Miocene.
The formation of a shelf-delta system marks a dramatic shift in the evolution of the southward
prograding delta system following a eustatic sea-level low. In the foreland areas, erosional offloading
with foreland uplifting caused a wide active fluvial system and formed transverse rivers
distally in the late–middle- to late-Miocene.
Identifier http://uyr.uy.edu.mm/handle/123456789/195
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