Structure and evolution of the Ban Pong Basin, Chiang Mai Province, Thailand

© 2018 Elsevier Ltd The Ban Pong Basin (BPB) is a small intermontane basin of Neogene age on the western margin of the Chiang Mai Basin in northern Thailand. The BPB was discovered in 2012 because of new quarrying activity. The basin complex formed in the hanging wall of a major Cenozoic low-angle n...

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Main Authors: Niti Mankhemthong, Christopher K. Morley, Pratchaya Takaew, Brady P. Rhodes
Format: Journal
Published: 2018
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http://cmuir.cmu.ac.th/jspui/handle/6653943832/62694
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spelling th-cmuir.6653943832-626942018-11-29T07:40:44Z Structure and evolution of the Ban Pong Basin, Chiang Mai Province, Thailand Niti Mankhemthong Christopher K. Morley Pratchaya Takaew Brady P. Rhodes Earth and Planetary Sciences © 2018 Elsevier Ltd The Ban Pong Basin (BPB) is a small intermontane basin of Neogene age on the western margin of the Chiang Mai Basin in northern Thailand. The BPB was discovered in 2012 because of new quarrying activity. The basin complex formed in the hanging wall of a major Cenozoic low-angle normal fault (LANF) called the Inthanon Detachment, and provides a unique record of the Neogene deformation related to the detachment. The BPB's preservation is probably due to its location in a synform within the rising Western Ranges metamorphic complex, which forms the Suthep-Inthanon mountain range. Initially, extensional faults in the BPB were oriented ∼N-S but then rotated to NNW-SSE, NW-SE, and ENE-WSW to NE-SW directions, which we interpret as arising due to local stress rotation related to the adjacent rising metamorphic complex. Folds, thrusts, and inverted normal faults both within Neogene sediments of the Mae Rim Formation and adjacent Palaeozoic metasedimentary rocks indicate a phase of compression that affected the basin late in its history (probably latest Miocene-Pliocene based on the regional timing of inversion). Complete Bouguer anomaly interpretations of 235 reduced gravity stations reveal two en echelon sub-basins, bounded by gravity highs related to shallow-lying Palaeozoic rocks and underlying high-grade metamorphic basement rocks. Two gravity-density cross-section models indicate the basin fill comprises up to 250 m of weakly lithified syn-rift sediments. The absence of a classic half graben morphology is probably related to inversion and erosion that significantly modified the extensional basin geometry and original thickness. 2018-11-29T07:40:44Z 2018-11-29T07:40:44Z 2018-01-01 Journal 13679120 2-s2.0-85053358851 10.1016/j.jseaes.2018.09.010 https://www.scopus.com/inward/record.uri?partnerID=HzOxMe3b&scp=85053358851&origin=inward http://cmuir.cmu.ac.th/jspui/handle/6653943832/62694
institution Chiang Mai University
building Chiang Mai University Library
country Thailand
collection CMU Intellectual Repository
topic Earth and Planetary Sciences
spellingShingle Earth and Planetary Sciences
Niti Mankhemthong
Christopher K. Morley
Pratchaya Takaew
Brady P. Rhodes
Structure and evolution of the Ban Pong Basin, Chiang Mai Province, Thailand
description © 2018 Elsevier Ltd The Ban Pong Basin (BPB) is a small intermontane basin of Neogene age on the western margin of the Chiang Mai Basin in northern Thailand. The BPB was discovered in 2012 because of new quarrying activity. The basin complex formed in the hanging wall of a major Cenozoic low-angle normal fault (LANF) called the Inthanon Detachment, and provides a unique record of the Neogene deformation related to the detachment. The BPB's preservation is probably due to its location in a synform within the rising Western Ranges metamorphic complex, which forms the Suthep-Inthanon mountain range. Initially, extensional faults in the BPB were oriented ∼N-S but then rotated to NNW-SSE, NW-SE, and ENE-WSW to NE-SW directions, which we interpret as arising due to local stress rotation related to the adjacent rising metamorphic complex. Folds, thrusts, and inverted normal faults both within Neogene sediments of the Mae Rim Formation and adjacent Palaeozoic metasedimentary rocks indicate a phase of compression that affected the basin late in its history (probably latest Miocene-Pliocene based on the regional timing of inversion). Complete Bouguer anomaly interpretations of 235 reduced gravity stations reveal two en echelon sub-basins, bounded by gravity highs related to shallow-lying Palaeozoic rocks and underlying high-grade metamorphic basement rocks. Two gravity-density cross-section models indicate the basin fill comprises up to 250 m of weakly lithified syn-rift sediments. The absence of a classic half graben morphology is probably related to inversion and erosion that significantly modified the extensional basin geometry and original thickness.
format Journal
author Niti Mankhemthong
Christopher K. Morley
Pratchaya Takaew
Brady P. Rhodes
author_facet Niti Mankhemthong
Christopher K. Morley
Pratchaya Takaew
Brady P. Rhodes
author_sort Niti Mankhemthong
title Structure and evolution of the Ban Pong Basin, Chiang Mai Province, Thailand
title_short Structure and evolution of the Ban Pong Basin, Chiang Mai Province, Thailand
title_full Structure and evolution of the Ban Pong Basin, Chiang Mai Province, Thailand
title_fullStr Structure and evolution of the Ban Pong Basin, Chiang Mai Province, Thailand
title_full_unstemmed Structure and evolution of the Ban Pong Basin, Chiang Mai Province, Thailand
title_sort structure and evolution of the ban pong basin, chiang mai province, thailand
publishDate 2018
url https://www.scopus.com/inward/record.uri?partnerID=HzOxMe3b&scp=85053358851&origin=inward
http://cmuir.cmu.ac.th/jspui/handle/6653943832/62694
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