SEDIMENTARY FACIES ANALYSIS OF THE KALAW FORMATION IN THE TIGYIT AREA, SOUTHERN SHAN STATE, MYANMAR
Abstract
- The study area is located in the Pinlaung Township, Southern Shan State. The study area is mainly composed of Cenozoic to Mesozoic clastic sediments and subordinate amount of Paleozoic and Mesozoic carbonate rocks. The sedimentary rocks are Nwabangyi Dolomite Formation (Late Permian to Early Triassic), Natteik Formation (Middle Triassic), Loi-an Group (Jurassic), Kalaw Formation (Cretaceous), and Hsi-hkip Formation (Pliocene). The Kalaw Formation is well exposed in the eastern and western parts of the study area mainly found at Myatheintan range and Tayoketaung range with the total thickness of Kalaw Formation is estimated about 645 m (21, 10 feet). Kalaw Formation comprises the clastic sequences of conglomerate, sandstone, siltstone, and subordinate shale. Kalaw Formation is divisible into three different members: Lower conglomerate-sandstone member, Middle sandstone-shale member, and Upper conglomerate member. Kalaw Formation consists of six lithofacies such as Massive clast-supported conglomerate, Massive matrix-supported conglomerate, Planar cross-bedded conglomerate, Ripple laminated sandstone, Thin-bedded sandstone interbedded with siltstone, and Massive siltstone respectively. These facies are representing of the Alluvial Fan Association, Channel Association, Overbank Association, and Flood Basin Association. The clastic sequences of the Kalaw Formation were deposited in the debris-flow dominated alluvial fan environment.
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Year
- 2020
Author
-
Wai Wai Lwin
Subject
- Geology
Publisher
- Myanmar Academy of Arts and Science (MAAS)