Tectonic and Evolution Characteristics of Basins in Andaman Sea

Abstract

The study on deposition and structural development history of the basins in Andaman Sea involved tectonic patterns, tectonic stress field features, deposition sequence and source provenance analysis. Through building up the important cross‐section and faults system, combining with the regional tectonic evolution and using the geological, geophysical and geochemistry data, this paper analyzed the tectonic evolution characteristics of the basins in Andaman Sea. The basins in Andaman Sea have experienced pre‐rifting, syn‐rifting and inherit compression‐shear transformation since Late Miocene. The early‐period normal faults which were formed during the early stage of the pre ‐rifting were developed in the basin. The regional fractures were greatly influenced by Sagaing fault. The developed faults and folds in the late period were related to the direction of Sagaing fault and Indian Plate subduction from NNE. The basins in Andaman Sea have many diapiric structures, including accretionary wedge mixing medium diaper, magmatic arc diapir and mud diapir caused by back‐arc striking-slip fault. Among them, the accretionary wedge mixing medium diapir is a special diapiric structure in the convergent continental margin of Burma sea. Special geographic position decides its individual tectonic stress field and the geotectonic evolution of basin. Intensive study on the basins in Andaman Sea will be in favor of exploring the oil and gas of convergent continental margin and play an instructive role in the development of plate tectonics.