ORIGINAL RESEARCH article
Front. Mar. Sci.
Sec. Deep-Sea Environments and Ecology
Volume 12 - 2025 | doi: 10.3389/fmars.2025.1633707
The dynamic mechanism of north-south tectonic disparities in the Rakhine Offshore Basin of Myanmar
Provisionally accepted
- PetroChina Hangzhou Research Institute of Geology, Hangzhou, China
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The Rakhine Offshore Basin is located within an accretionary wedge in the trench setting of an active continental margin, exhibiting complex and dynamic characteristics. Its structure is notably segmented from north to south and zoned from east to west. The basin is divided into two segments along the north-south axis: the northern segment features a compressional fold belt, while the southern segment is characterized by a strike-slip belt. Along the east-west axis, the basin is divided into two zones: the eastern zone represents the early-stage, steeply folded belt, where the shallow part is disrupted by thrust faults, while the western zone is marked by later, gentle sedimentary structure. Despite these detailed structural observations, current research on the structural and evolutionary characteristics of the Rakhine Offshore Basin is still limited, and the underlying causes of its northsouth segmentation and east-west zonation remain unclear. Using seismic and drilling data, we provide a comprehensive examination of the structural and evolutionary characteristics of the basin. The results indicate that the Rakhine Offshore Basin formed at the end of the Upper Cretaceous, experiencing significant deformation from the end of the Upper Miocene to the Quaternary. The structural formation progressed from east to west, occurring earlier and more intensely in the east, and later and more gently in the west. After Miocene sedimentation, the regional structure underwent inversion, with the depocenter migrating from east to west. The segmentation from north to south and zonation from east to west in the Rakhine Offshore Basin are attributed to the oblique subduction and collision of the Indian Ocean plate with the Eurasian plate. The subduction angle is gentler in the south and steeper in the north, reflecting varying stress field mechanisms across these regions.
Keywords: Rakhine Offshore Basin, compressional fold belt, strike-slip fold belt, stress field, Oblique subduction
Received: 23 May 2025; Accepted: 18 Aug 2025.
Copyright: © 2025 Wang, Fang, Wang, Fan, Zuo, Xu and Yang. This is an open-access article distributed under the terms of the Creative Commons Attribution License (CC BY). The use, distribution or reproduction in other forums is permitted, provided the original author(s) or licensor are credited and that the original publication in this journal is cited, in accordance with accepted academic practice. No use, distribution or reproduction is permitted which does not comply with these terms.
* Correspondence: Gui Fang, PetroChina Hangzhou Research Institute of Geology, Hangzhou, China
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