STRUCTURAL CHARACTERISTIC OF EARLY EOCENE EXTENSIONAL FAULT IN SONGHKLA BASIN, GULF OF THAILAND
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Abstract
The Songkhla Basin is a classic example of a Cenozoic rift basin in the Gulf of Thailand. The basin is 75 km long (N-S) and 30 km wide (E-W). Its primary geometry is strongly influenced by the main N-S to NNW-SSE, east-dipping boundary fault zone on the western side of the basin, forming an elongated half-graben under E-W extension since the Eocene. Many faults strike predominantly orthogonal to the extension direction. In this study, a set of E-W to WNW-ESE, north-dipping extensional faults is mapped based on 3D seismic data, occurring in the early Eocene syn-rift strata. The younger, N-S striking normal faults either cut across or terminate against the older, basement-involved, E-W to WNW-ESE striking normal faults. The presence of both types of fault interactions in the Songkhla Basin suggests the possibility of multiple phases of non-coaxial extension during the Eocene. This study presents the structural characteristics and 3D geometry of the early Eocene extensional faults, with a discussion on tectonic development.
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Copyright © 2008 Department of Geology, Faculty of Science, Chulalongkorn University. Parts of an article can be photocopied or reproduced without prior written permission from the author(s), but due acknowledgments should be stated or cited accordingly.
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