Depositional system and sequence stratigraphic analysis of east andaman basin

การวิเคราะห์ระบบการตกทับถมและการจัดลำดับชั้นหินในพื้นที่แอ่งอันดามันตะวันออก

Name: Pariyakorn Som-in

LCSH: Geology, Stratigraphic

Classification :.DDC: 551.7

LCSH: Aquifers

Abstract: This research applies seismic stratigraphic principles to understand the depositional units in the East Andaman Basin situated at the Andaman Sea using regional 2D data. This Basin is a complex backarc extensional system, lying along a highly oblique convergent margin attributed to the subduction of Australian and Indian plates beneath the Sunda plate (previously called SE Asian plate) during the Cenozoic. The East Andaman Basin extends from the Gulf of Mottama (Martaban) to the Mergui Basin towards south. Sediment deposited in this basin during the late Miocene-Pliocene is primarily sourced from the Ayeyarwady and the Salween rivers in the Gulf of Mottama. Prior to that time, the sediment source area was primarily from the east. Synrift and the post rift are present on 2D seismic sections. The syn-rift phase was active from Oligocene to Early Miocene (or Eocene to Early Middle Miocene). The post-rift phase deposited during the Middle Miocene to Recent. The regional scale subsidence might be the coeval event to the sea-floor spreading in the Andaman Sea, attributed to relative sea level rise and sediment deposition dominated by thick transgressive packages during the Middle Miocene to Upper Miocene developed along the basin side. This sediment was supplied from Ayerwaddy and Salween rivers from the north (Myanmar). On the other side huge progradingclionoforms indicate rapid westward deposition during Upper Miocene from the shelf area along the eastern boundary of the study area (Peninsular Thailand). The shelf slope deposits show significant similarity g with Vail’s classic model depicting prograding clinoforms, canyon fills, and channellevee complex indicated by gull-wing structures and basin floor fan. Based on these observations, a conceptual stratigraphic model along with a chronostratigraphic chart has been proposed for the post-rift section continued through Middle Miocene to Recent.

Chiang Mai University Library

Address: Chiang Mai

Email: cmulibref@cmu.ac.th

Name: Helmut Jakubowicz

Role: Chairman

Name: Christopher K. Morley

Role: Member

Name: Jaydeep Ghosh

Role: Member

Name: Diako Hariri Naghadeh

Role: Member

Created: 2016

Modified: 2020-01-10

Issued: 2020-01-10

วิทยานิพนธ์/Thesis

application/pdf

Th 551.7 P234D

eng

DegreeName: Master of Science

Level: Master's Degree

Descipline: Petroleum Geophysics

Grantor: Chiang Mai University

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