| 西藏札达盆地沉积物的石英砂表面特征及其环境意义 |
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| 关键词:Zanda Basin quartz grain surface texture sedimentary environment Tibet |
| 基金项目:国家自然科学基金项目(40572134)和中国地质调查局项目(1212010511902)联合资助 |
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| Quartz grain Surface Characteristics of Sediments from the Zanda Basin of Tibet and Their Environmental Significance |
| The quartz grain surface structural characteristics of the strata in Xiangzi, Guge and Tuolin Formations of Zanda basin were studied under scanning electron microscope. The quartz grains of the three formations are poorly rounded, and the quartz grains are mainly in sharp-edged and subangular forms. Taking into account regional geology, the authors hold that the sedimentary provenance of the basin was very close to the basin subsidence area, being the mountainous area surrounding the basin. The sand surface of Upper and Middle Xiangzi Formation shows clear glacial characteristics, suggesting that the sedimentary environment was a shallow water periglacial river-lacustrine area. The existence of corrosion pits and trenches in the grains suggests that the sedimentary environment of Lower Xiangzi Formation was a deeper water periglacial river-lacustrine area. The quartz grain particle surface of Guge Formation assumes low chemical energy of lacustrine facies. The surface of quartz grain in Tuolin Formation shows characteristics of fluvial sedimentary facies. |
| HAN Jian-en,YU Jia,MENG Qing-wei,LÜ Rong-ping,ZHU Da-gang,MENG Xian-gang,SHAO Zhao-gang,YANG Chao-bin.2009.Quartz grain Surface Characteristics of Sediments from the Zanda Basin of Tibet and Their Environmental Significance[J].Acta Geoscientica Sinica,30(5):651-658. |
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