| 日喀则群沉积厚度、沉积速率及剥蚀速率 |
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| 引用本文： | 曾洪扬,曹珂. 日喀则群沉积厚度、沉积速率及剥蚀速率[J]. 成都理工大学学报(自然科学版), 2007, 34(5): 548-552 |
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| 作者姓名： | 曾洪扬 曹珂 |
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| 作者单位： | 1. 成都理工大学沉积地质研究院,成都,610059
2. 中国地质大学地球科学与资源学院,北京,100083 |
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| 摘 要： | 通过对日喀则弧前盆地日喀则群沉积的详细研究,对日喀则群的沉积厚度、沉积速率做了近似的计算.日喀则群现今保存下来的厚度平均为3 000 m,恢复其原始沉积厚度为4 800 m,从而计算得出沉积速率为34 cm/ka(未脱压校正值为22 cm/ka),主沉积期的沉积速率为308 cm/ka(未脱压校正);并且与其他几个白垩纪同类盆地进行对比,得出白垩纪此类盆地发育过程中,沉积速率的平均值为27.75 cm/ka.根据近似恢复的弧前盆地和剥蚀区的范围,计算得出沉积盆地沉积物充填总量最小90 750 km3,最大137 500 km3;物源区剥蚀速率最小0.1 mm/a,最大0.45 mm/a.
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| 关 键 词： | 日喀则群 沉积厚度 沉积速率 剥蚀速率 日喀则群 沉积厚度 沉积速率 剥蚀速率 thickness Tibet Group rates erosion 物源区 最小 充填 盆地沉积物 范围 平均值 发育过程 白垩纪 校正值 脱压 恢复 |
| 文章编号： | 1671-9727（2007）05-0548-05 |
| 修稿时间： | 2007-01-18 |
The thickness, sedimentation and erosion rates of the Xigaze Group in Tibet, China |
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| ZENG Hong-yang,CAO Ke. The thickness, sedimentation and erosion rates of the Xigaze Group in Tibet, China[J]. Journal of Chengdu University of Technology: Sci & Technol Ed, 2007, 34(5): 548-552 |
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| Authors: | ZENG Hong-yang CAO Ke |
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| Affiliation: | 1. Institute of Sedimentary Geology, Chengdu University of Technology, Chengdu 610059, China; 2. School of Earth Sciences and Resources, China University of Geosciences , Beijing 100083, China |
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| Abstract: | The thickness of sediments,sedimentation rate and erosion rate of the Xigaze Group in the Xigaze forearc basin are approximatedly calculated in this paper.The average thickness of sediments of the preserved Xigaze Group is 3000 m,and the calculated original sedimentary thickness is 4800 m after depressuring emendation according to the above thickness.The average sedimentation rate is 34 cm/ka(the nondepressured emendation sedimentation rate is 22 cm/ka) in the basin,but the sedimentation rate is up to 308 cm/ka(nondepressurization emendation) in the period of megasequence MS2.The calculated mass accumulation in the Xigaze forearc basin is approximatedly 90750~137500 km3 and the erosion rate of the provenance is 0.1~0.45 mm/a,in response to distributions of the forearc basin and erosion area rehabilitated probably.Based on these,the authors searched out some data about similar forearc basins,and calculated their erosion rates and their average sedimentation rates.The average is 26 cm/ka and closes to the rate of the Xigaze Group. |
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| Keywords: | Xigaze Group sedimentation thickness sedimentation and erosion |
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