106 GSA Geophysics and Geodynamics Division 50th Anniversary Special Session and George Woollard Lecture II

Monday, 10 October 2022
1:30 PM - 5:30 PM
205

TECTONICS OF THE SOUTHEAST ASIAN PACIFIC REGION

Paper number: 106-7
Program: Special Sessions
Time: 3:50 PM – 4:15 PM

Authors

Abstract

Southeast (SE) Asia is composed of an assemblage of accreted terrains that record a long history of magmatism and collisional orogenesis. Proposed tectonic reconstructions for this region share many similar features, including long-term convergence along the Sunda Trench of Indonesia. This process has resulted in the formation of magmatic arcs which, together with accreted continental fragments, form the central core zone of the aseismic, tectonically-stable Sunda block of western SE Asia. In contrast, the eastern segment of SE Asia, including the Banda Sea, Molucca Sea, New Guinea, and the Philippines, is a diffuse plate boundary zone with multiple young subduction zones, continental micro-fragments, and back-arcs at various stages of maturity. The tectonic style in this eastern segment is dominated by subduction rollback and back-arc extension along the Banda arc. In this study we analyze a broad swath of geologic and geophysical data to determine the key structural elements and active tectonic processes in SE Asia and the surrounding region.

Geological Society of America Abstracts with Programs. Vol. 54, No. 6

doi: 10.1130/abs/2022AM-380779

© Copyright 2022 The Geological Society of America (GSA), all rights reserved. Permission is hereby granted to the author(s) of this abstract to reproduce and distribute it freely, for noncommercial purposes. Permission is hereby granted to any individual scientist to download a single copy of this electronic file and reproduce up to 20 paper copies for noncommercial purposes advancing science and education, including classroom use, providing all reproductions include the complete content shown here, including the author information. All other forms of reproduction and/or transmittal are prohibited without written permission from GSA Copyright Permissions.