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| 云南洱海现代沉积研究 | |
| 引用本文： | D.Eism,孙顺才,X.Song,E.Thomasse.云南洱海现代沉积研究[J].湖泊科学,2000,12(1):25-37. |
| 作者姓名： | D.Eism 孙顺才 X.Song E.Thomasse |
| 作者单位： | 1. Netherlands Institute for Sea Research,Texel,and Department of Sedimentology,Institute of Earth Sciences,Utrecht University,The Netherlands 2. 中国科学院京地理与湖泊研究所,南京210008 3. 云南省地质研究所,昆明650011 |
| 摘 要： | 洱海是位于云南省境内较大的但相对较浅的断陷湖泊（水深小于２０ｍ）。根据１９９０－１９９３年对该湖现代沉积的研究，结果表明，湖泊沉积物主要是来自西部相对高２０００ｍ以上的山地，东部为低矮石灰岩山地，物源较少，南北两条入湖河流亦是重要的物源供应区。湖区沉积物主要是由粉砂质粘土组成，来自山地的粗碎屑物质则大量的堆积于此地，三角洲、扇三角洲及滨湖地带，沉积速度在过去１３０００年中平均为０．２ｃｍａ＾－１， |
| 关 键 词： | 云南 洱海 沉积 现代沉积 湖泊沉积 |
| 收稿时间： | 1998/8/10 0:00:00 |
| 修稿时间： | 1998-08-10 |
Sedimentation in Erhai Lake, Yunnan Province, China |
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| D. Eism,S. Sun,X. Song and E. Thomasse.Sedimentation in Erhai Lake, Yunnan Province, China[J].Journal of Lake Science,2000,12(1):25-37. | |
| Authors: | D Eism S Sun X Song and E Thomasse |
| Institution: | D. Eisma (Netherlands Institute for Sea Reseach, Texel,and Department of Sedimentology,Institute of Earth Sciences, Utrecht University,The Netherlands)S. Sun (Nanjing Institute of Geography and Limnotogy,CAS, Nanjing 210008.P. R.China)X. Song (Geological Institute of Yunnan Province. Kunming 650011,P.R.China)E. Thomasse (Netherlands Institute for Sea Reseach, Texel,and Department of Sedimentology,Institute of Earth Sciences, Utrecht University,The Netherlands) |
| Abstract: | Erhai Lake in S.W. China is a large, shallow (<20m deep) rift lake.Sediment supply comes mainly from the mountains west of the lake that reach a relative height of 2000m. Supply from the east, a relatively low limestone country,ia small.Two rivers supply sediment from north and south.Bottom deposits are predominantly silty mud:coarse material supplied from the mountains has been deposited on broad terraces, deltas, delta-fans,and nearsbore in the lake.Deposition rates during the past 13000 years have been low, on the average 0.2 cm a-1, which is equivalent to about 600 t a -1, over the entire lake and is of the same order ms the amount of susponded sediment present in February 1992.This points to storage of sedimont on land during periods of relatively largo supply (period of large rainfall, destruction of vegetation, or earthquakes) and it explains the continuing existence of the shallow lake. Average sediment deposition may have varied by a factor of 2 or 3 at most. Currents redistribute the sediment over the lake floor in flat beds extending over almost the entire lake. There is very little ev idonce of slumping or sliding. The composition of the sediment reflects the composition of the rocks and soils in the source areas with an additional biogenic component(mainly diatom opal).There is a relative abundance of trace elements, which may he the result of leaching on land, pollution and/or the fine grain of the sediment. |
| Keywords: | Erhai Lake sedimentation |
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