| Sedimentary facies of Maastrichtian to Danian deposits in Amur River area, Russian Far East |
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| 作者姓名： | ShigeyukiSuzuki AbdulR.Ashraf HakuyuOkada |
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| 作者单位： | [1]DepartmentofEarthSciences,FacultyofScience,OkayamaUniversity,Okayama700-8530,Japan [2]InstituleofGeosciences,UniversityofTuebingen,TuebingenD-72076,Germany [3]4-8-36-601Yoshizuka,Hakata-ku,Fukuoka812-0041,Jopan |
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| 摘 要： | Sedimentary facies of the Tsagayan Formation is distributed in the eastern Zeya-Bureya Basin has been analyzed. The formation is of the Maastrichtian to Danian in age and characterized by the cyclicity of the fining-upwards successions. Analysis of environmental changes during the K/T boundary is the focus of this study. Five facies have been identified: Facies A, thick and laterally extensive coarse-grained to medium-gained sandstone units, interpreted as channelfill deposits; Facies B, parallel-laminated to massive mudstone units interpreted as interchannel lakes and flood plain deposits; Facies C, sheet-like medium-grained to fine-grained sandstones interpreted as crevasse splay deposits; Facies D, coal to coaly mudstone beds interpreted as deposits of peatlands; Facies E, very poorly sorted sandy mudstone beds interpreted as debris flow deposits. Fluvial environments with the low-relief fiat topography was inferred. A channel transported large volumes of clasts, and a flood basin with interchannel lakes and peatlands was deciphered. Any distinct change of sedimentary environments has not been identified throughout the Tsagayan Formation (including the K/T boundary). However, two beds of debris flow deposits were identified. The one occurs at the uppermost part of the lower Tsagayan Subformation and contains dinosaur fossils. The other is intercalated in the upper Tsagayan Subformation.
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| 关 键 词： | 河流沉积 Tsagayan结构 Zeya-Bureya盆地 阿穆尔河 分布规律 |
Sedimentary facies of Maastrichtian to Danian deposits in Amur River area, Russian Far East |
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| ShigeyukiSuzuki AbdulR.Ashraf HakuyuOkada.Sedimentary facies of Maastrichtian to Danian deposits in Amur River area, Russian Far East[J].Journal of Geoscientific Research in Northeast Asia,2004,7(2):149-155. |
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| Authors: | Shigeyuki Suzuki Abdul R Ashraf Hakuyu Okada |
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| Institution: | Shigeyuki Suzuki1,Abdul R. Ashraf 2,Hakuyu Okada3 1. Department of Earth Sciences,Faculty of Science,Okayama University,Okayama 700-8530,Japan, 2. Institute of Geosciences,University of Tuebingen,Tuebingen D-72076,Germany, 3. 4-8-36-601 Yoshizuka,Hakata-ku,Fukuoka 812-0041,Japan |
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| Abstract: | Sedimentary facies of the Tsagayan Formation is distributed in the eastern Zeya-Bureya Basin has been analyzed. The formation is of the Maastrichtian to Danian in age and characterized by the cyclicity of the fining-upwards successions. Analysis of environmental changes during the K/T boundary is the focus of this study. Five facies have been identified: Facies A, thick and laterally extensive coarse-grained to medium-grained sandstone units, interpreted as channelfill deposits; Facies B, parallel-laminated to massive mudstone units interpreted as interchannel lakes and flood plain deposits; Facies C, sheet-like medium-grained to fine-grained sandstones interpreted as crevasse splay deposits; Facies D, coal to coaly mudstone beds interpreted as deposits of peatlands; Facies E, very poorly sorted sandy mudstone beds interpreted as debris flow deposits. Fluvial environments with the low-relief flat topography was inferred. A channel transported large volumes of clasts, and a flood basin with interchannel lakes and peatlands was deciphered. Any distinct change of sedimentary environments has not been identified throughout the Tsagayan Formation (including the K/T boundary). However, two beds of debris flow deposits were identified. The one occurs at the uppermost part of the lower Tsagayan Subformation and contains dinosaur fossils. The other is intercalated in the upper Tsagayan Subformation. |
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| Keywords: | fluvial deposits Tsagayan Formation Zeya-Bureya Basin K/T boundary Amur River area |
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