藏南沉错湖泊三角洲的沉积相及沉积环境
Sedimentary environments and facies about Chen Co lacustrine delta, South Tibetan Plateau
查看参考文献26篇
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文摘
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在西藏自治区沉错湖泊三角洲平原和湖内钻孔取芯,利用"C和ESR测年方法建立了钻孔剖面的年代标尺.在岩芯描述、沉积物粒度分析和CaCO3含量分析基础上,对沉错湖泊三角洲的沉积环境和沉积相进行了解释分析.36.7m长的岩芯大致记录了5.5万年以来的沉积历史.全孔平均沉积速率约为0.667mm/a.16920 aBP以来三角洲的沉积速率较大,平均为1.27mm/a.由于沉积物物质来源的多源性导致CaCOs在剖面上的元规律性变化.但是,沉积物粒度和沉积序列变化指示全套沉积由底部的冲积扇相向上过渡为水下扇亚相和三角洲沉积相.在大约17500aBP～14000aBP时期,沉错存在高湖面阶段.沉积序列中记录了末次冰期最盛期(Last Glacial Maximum)和新仙女木事件(Younger Dryas).沉积特征和沉积环境的变化主要受湖面涨缩变化所控制.而湖面升降变化的驱动因素主要为气候,尤其夏季风的强弱和冷事件. |
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其他语种文摘
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Chen Co lake is located at northern slope of the Himalayas. The geographical lo-cation of Chen Co lake is 28°53'~28o59'N,90°28'~90o35'E . The maximums of length and width are 11km and 7. 8km respectively. The area of lake is about 37km2. The maximum of depth is 31m. In lacustrine delta of Chen Co lake, 2 boreholes were drilled. In addition, using piston sampling method, 2. 16m sedimentary core was gathered at 8m of the lake wa-ter depth. In laboratory, the time scale was established by MC and ESR dating. On the ba-sis of core description, grain size distribution, and CaCO3 content analysis, the sedimenta-ry environments and facies of lacustrine delta were explained. The 36. 70m longer drilling core on the lacustrine delta plain recorded the sedimentary history since about 55000 aBP. The mean sedimentary rate of the whole borehole is about 0. 667mm/a. Since 16920 aBP, the sedimentary rate rose and reached up to 1. 27mm/a or so. The sediments of Chen Co delta indicate a complex of depositional processes. The main body of sediment consists of debris deposition of land-origin. The sedimentary strata sequence and sub-environment of deposition were recognized according to the colour, lithology, grain size, sedimentary structure, etc. Due to the multi-provenance of sediment material, the CaCOscontent of la-custrine sediment showed ruleless change on profile. But, the grain size and sedimentary sequence indicated that the total sediment consisted of alluvial fan, subaquatic alluvial fan (fan delta) and delta sediment from bottom to upper. The sedimentary environment of del-ta also changed among delta front, delta plain and prodelta. Up to now, it presented the nature of delta plain environment. During 175OOaBP-HOOOaBP, Chen Co lake witnessed the greatest lake period. In addition, the sedimentary sequence recorded the Last Glacial Maximum (LGM) and Younger Dryas cold event. The sedimentary characteristics and sedimen-tary environment were controlled by lake-level fluctuations. The authors suggested the driving factor of lake-level fluctuation is climate, especially the change of summer monsoon. |
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来源
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地理研究
,2004,23(5):649-656 【核心库】
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关键词
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沉错
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三角洲
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沉积环境
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沉积相
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湖面变化
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地址
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1.
中国科学院地理科学与资源研究所, 北京, 100101
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河北科技师范学院计算机系, 秦皇岛, 066004
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语种
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中文 |
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文献类型
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研究性论文 |
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ISSN
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1000-0585 |
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学科
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自然地理学 |
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基金
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国家973计划
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中国科学院知识创新工程项目
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文献收藏号
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CSCD:1609877
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参考文献 共
26
共2页
|
|
1.
Corcoran P L. evidence from the Archaean Keskarrah Formation.
Canada Sedimentary Geology,1998,120:125-152
|
CSCD被引
1
次
|
|
|
|
|
2.
Muchlus M. Reconstructing low levels of Lake Lisan by correlating fan-delta and lacustrine deposits.
Quaternary International,2000,73/74:137-144
|
CSCD被引
1
次
|
|
|
|
|
3.
Bourquin S. an example from the Keuper Chaunoy Sandstones.
Paris Basin Sedimentary Geology,1998,121:207-257
|
CSCD被引
5
次
|
|
|
|
|
4.
王君波. 藏南沉错沉积物的粒度特征及其古环境意义.
地理科学进展,2002,21(5):459-467
|
CSCD被引
49
次
|
|
|
|
|
5.
王苏民. 湖泊沉积是研究历史气候的有效手段--以青海湖、岱海为例.
科学通报,1990,35(1):54-56
|
CSCD被引
19
次
|
|
|
|
|
6.
朱立平. 西昆仑山南红山湖沉积反映的过去150年湖区环境变化.
中国科学(D),2001,31(7):601-607
|
CSCD被引
26
次
|
|
|
|
|
7.
朱立平. 高原全新世环境演变.
青藏高原形成环境与发展,2002:83-92
|
CSCD被引
1
次
|
|
|
|
|
8.
王苏民. 中国湖泊志.
中国湖泊志,1998:438
|
CSCD被引
2
次
|
|
|
|
|
9.
关志华. 西藏河流与湖泊.
西藏河流与湖泊,1984:159-168
|
CSCD被引
7
次
|
|
|
|
|
10.
羊向东. 藏南沉错钻孔硅藻组合与湖水古盐度定量恢复.
中国科学.D,2003,33(2):165-169
|
CSCD被引
2
次
|
|
|
|
|
11.
鲁兵. 青藏高原的盆地形成与分类.
石油学报,2000,21(2):21-26
|
CSCD被引
23
次
|
|
|
|
|
12.
西藏自治区地质矿产局. 西藏自治区地质矿产局.
西藏区域地质志,1993:141-142,198-199
|
CSCD被引
1
次
|
|
|
|
|
13.
Zhu L P. 1400-year cold/warm fluctuations reflected by environmental magnetism of a lake sediment core from the Chen Co.
Journal of Paleolimnology,2003,29(4):391-401
|
CSCD被引
18
次
|
|
|
|
|
14.
朱立平. 环境磁学反映的藏南沉错地区1300年来冷暖变化.
第四纪研究,2001,21(6):520-527
|
CSCD被引
31
次
|
|
|
|
|
15.
于兴河. 湖泊辫状河三角洲岩相、层序特性及储层地质模型??内蒙古贷岱海湖现代三角洲沉积考察.
沉积学报,1995,13(1):48-58
|
CSCD被引
48
次
|
|
|
|
|
16.
王寿庆. 扇三角洲模式.
扇三角洲模式,1993:96-97
|
CSCD被引
2
次
|
|
|
|
|
17.
石占中. 湖平面频繁变化环境下的扇三角洲沉积.
西安石油学院学报(自然科学版),2002,17(1):24-27
|
CSCD被引
6
次
|
|
|
|
|
18.
Bogen J. Morphology and sedimentology of deltas in fjord and fjord valley lakes.
Sedimentary Geology,1983,36(2/4):245-267
|
CSCD被引
1
次
|
|
|
|
|
19.
解习农. 琼东南盆地崖南凹陷海湾扇三角洲体系沉积构成及演化模式.
沉积学报,1996,14(3):64-71
|
CSCD被引
7
次
|
|
|
|
|
20.
焦养泉. 扇三角洲沉积体系及其与油气聚集关系.
沉积学报,1998,16(1):70-75
|
CSCD被引
26
次
|
|
|
|
|
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