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Initiation and evolution of forearc basins in the Central Myanmar Depression

Cai Fulong, Ding Lin, Zhang Qinghai, Devon A. Orme, Wei Honghong, Li Jinxiang, Zhang Ji'en, Than Zaw and Kyaing Sein
Initiation and evolution of forearc basins in the Central Myanmar Depression
Geological Society of America Bulletin (October 2019) 132 (5-6): 1066-1082

Abstract

The forearc basin in Myanmar is significant in understanding the development of continental forearc basins. We present stratigraphic, sandstone petrographic, and U-Pb detrital data from Upper Cretaceous-Eocene strata of Chindwin and Minbu sub-basins in the Central Myanmar Depression. The Upper Cretaceous lower Kabaw Formation consists of turbiditic conglomerate, sandstone, and mudstone in the Minbu sub-basin. The composition of conglomerates are mainly schist and subordinate quartz. Prominent detrital zircon age probability peaks are between 260 and 223 Ma, similar with that of Upper Triassic Pane Chaung turbidites and Kanpetlet schist on the West Burma plate. In the upper Kabaw Formation, turbiditic volcanic-rich sandstones have major age populations ranging from 103 to 70 Ma in both Minbu and Chindwin sub-basins. The Paleocene slope environment Paunggyi Formation, which overlies the Kabaw Formation, mainly consists of conglomerate, sandstone, mudstone, and tuff beds in the Minbu sub-basin. In contrast, the Paunggyi Formation in the Chindwin sub-basin is composed of sandstone and mudstone; major detrital zircon age populations from the Paunggyi Formation are between 100 and 60 Ma. Eocene strata in both basins are composed mainly of shallow marine to delta sandstone and mudstone. Major detrital zircon age populations are 100-36 Ma and 600-500 Ma. The Late Cretaceous-Eocene ages from Upper Cretaceous-Eocene strata overlap with igneous crystallization ages from the Western Myanmar Arc. We propose that the Chindwin and Minbu sub-basins developed as parts of a forearc basin along the west flank of Western Myanmar Arc (present coordinate). The forearc basin initiated in Albian time atop the continental West Burma plate due to the formation of a structural high along the western margin of West Burma plate.


ISSN: 0016-7606
EISSN: 1943-2674
Coden: BUGMAF
Serial Title: Geological Society of America Bulletin
Serial Volume: 132
Serial Issue: 5-6
Title: Initiation and evolution of forearc basins in the Central Myanmar Depression
Affiliation: Chinese Academy of Sciences, Institute of Tibetan Plateau Research, Laboratory of Continental Collision and Plateau Uplift, Beijing, China
Pages: 1066-1082
Published: 20191014
Text Language: English
Publisher: Geological Society of America (GSA), Boulder, CO, United States
References: 64
Accession Number: 2019-095258
Categories: StratigraphyGeochronology
Document Type: Serial
Bibliographic Level: Analytic
Annotation: GSA Data Repository item 2019358
Illustration Description: illus. incl. strat. col., geol. sketch map
N18°00'00" - N25°00'00", E94°00'00" - E97°00'00"
Secondary Affiliation: Montana State University, USA, United StatesChinese Academy of Sciences, Institute of Geology and Geophysics, CHN, ChinaMyanmar Geosciences Society, BUR, Burma
Country of Publication: United States
Secondary Affiliation: GeoRef, Copyright 2020, American Geosciences Institute. Reference includes data from GeoScienceWorld, Alexandria, VA, United States. Reference includes data supplied by the Geological Society of America, Boulder, CO, United States
Update Code: 201950
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