Association of oil source algae in some Tertiary basins,northern Thailand |
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| Affiliation: | 1. Department of Geological Sciences, Faculty of Science, Chiang Mai University, Chiang Mai, 50200, Thailand;1. Bozok University, Department of Geological Engineering, 66100, Atatürk Way, Yozgat, Turkey;2. Ankara University, Department of Geological Engineering, 06100, Tandogan, Ankara, Turkey;1. Key Laboratory of Orogenic Belts and Crustal Evolution, School of Earth and Space Sciences, Peking University, 100871 Beijing, PR China;2. College of Palaeontology, Shenyang Normal University, 110034 Shenyang, PR China;3. College of Earth Science and Engineering, Shandong University of Science and Technology, 266590 Qingdao, Shandong, PR China;4. Department of Geological Sciences, University of Saskatchewan, S7N 5E2 Saskatoon, Saskatchewan, Canada;5. School of Biological Sciences, Victoria University of Wellington, Kelburn, 6012 Wellington, New Zealand;1. Anhui Geological Museum, Hefei 230031, PR China;2. State Key Laboratory of Systematic and Evolutionary Botany (LSB), Institute of Botany, Chinese Academy of Sciences, Beijing 100093, PR China;3. State Key Laboratory of Palaeobiology and Stratigraphy (LPS) and Department of Palaeobotany and Palynology, Nanjing Institute of Geology and Palaeontology, Chinese Academy of Sciences, Nanjing 210008, PR China;4. School of Geography, Earth and Environmental Sciences, University of Birmingham, Edgbaston, Birmingham B 15 2TT, UK |
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| Abstract: | A coal petrographic study of sediments, including coals, oil shale, and oil source rocks, in the fossil fuel deposits of northern Thailand revealed changes in alginite associations. In the Lower part of these Tertiary deposits, especially in the Fang oilfield, alginite A (a Botryococcus sp.) was the only type of alga found. Later, the association of Botryococcus braunii, Pila algae, thick-walled alginite B, and temperate palynomorphs were recognized in many coalfields, as well as in the middle part of the deposits in the Fang Basin. Their ages were Late Oligocene (?) to Early Miocene. In the upper part of the fossil fuel deposits, alginite B is dominant in many basins, together with Botryococcus-related taxa such as Pila algae, Reinschia and fresh-water-dwelling ferns. In the Mae Sod Basins Reinschia was found to be dominant in the northern part, whereas lamaginite dominated in the south, showing different environmental conditions in different parts of the basin during deposition. These different associations indicate changes in depositional environments in northern Thailand, resulting from climatic and/or sea level changes during Tertiary time. |
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