The Rakhine Coastal

Both on land and offshose continental shelf of this belt are narrow in the south and become wider in the north because they are controlled by underlying structures and prevaitling tectonic stress regions. They are underlain by deformed Indoburman Flysch tectonically inter-mixed with mélanges, comprising exotic blocks of limestone and mafic volcanic and ultramafic rock of phiolite affinity, particularly in its southern part. The upper tertiary strata of molasse facies overlap the deformed flysch strata of loder age in the north and east. The molasse strata of this belt belong to the Bangal Bain to the west, a kind of fore-deep Basin beneath west-vergant fold and thrust fault of WR. Containtal shelf offshore to the west of the Rakhin coast is narrow in the south. The Wr and the Rakhin Coastal Belt (RCB) are sparated by series of faults mark by the topographic breaks.

The Arakan Costal Belts in the narrow southern part of the Assam trough, and the lithological types deposited there are similar to those the Central Belts. The Arakan Costal Area extends west of the Indoburman Ranges. Geologically, this area has much in common with the Arakan Yoma because it is part of the same fold belt. Upper Cretaceous (?) and Eocene, and also – unlike in the Arakan Yoma – Oligocene and Miocene sediments are exposed. The sedimentary sequences are cut in places by volcanic dykes.  On the island of Ramree and Cheduba, as well as on smaller neighbouring island and further north on the mainland, natural gas seepages have formed mud volcanoes of sometime considerable size (Bender, 1983).

In the offshorse area, seismic reflection survey revealed narrow 30 to 80 km long, often faults and offset anticlinal trends with special culminations of Pre-Paleozoic rocks. They run generally in S-N and SSW-NNE directions. In the coastal area, Miocene sequences are frequently steeply tilted, intensively faulted, locally fold and overthrusted. The pre-Miocene flysch rocks occurring below the transgressive Miocene Beds show the structural style of the Indo-Burma Ranges (Atlas Of Mineral Resources of the Escap Region, 1996).

reference: 

Atlas of Mineral Resources of the Escpe Region Volume 12, 1996