藏南沉错湖泊三角洲的沉积相及沉积环境

doi:10.11821/yj2004050009

地理研究 ›› 2004, Vol. 23 ›› Issue (5): 649-656.doi: 10.11821/yj2004050009

藏南沉错湖泊三角洲的沉积相及沉积环境

冯金良¹, 朱立平¹, 李玉香²

1. 中国科学院地理科学与资源研究所,北京100101;
2. 河北科技师范学院计算机系,秦皇岛066004

收稿日期:2004-01-05 修回日期:2004-06-15 出版日期:2004-10-15 发布日期:2004-10-15
作者简介:冯金良(1964-),男,河北藁城人,博士,副研究员。主要从事地貌与第四纪地质研究。E-mail:fengjl @igsnrr.ac.cn
基金资助:
国家重点基础规划项目(G19980480);中科院知识创新项目(KZCX3SW321)资助

Sedimentary environments and facies about Chen Co lacustrine delta, South Tibetan Plateau

FENG Jin-liang¹, ZHU Li-ping¹, LI Yu-xiang²

1. Institute of Geographic Sciences and Natural Resources Research, CAS, Beijing 100101, China;
2. Hebei Science and Technology Normal University, Qinhuangdao 066004, China

Received:2004-01-05 Revised:2004-06-15 Online:2004-10-15 Published:2004-10-15

摘要/Abstract

摘要：

在西藏自治区沉错湖泊三角洲平原和湖内钻孔取芯 ,利用14 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 6 6 7mm/a。 16 92 0aBP以来三角洲的沉积速率较大 ,平均为 1 2 7mm/a。由于沉积物物质来源的多源性导致CaCO3在剖面上的无规律性变化。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 175 0 0aBP～ 14 0 0 0aBP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 (LastGlacialMaximum )和新仙女木事件 (YoungerDryas)。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

关键词: 沉错, 三角洲, 沉积环境, 沉积相, 湖面变化

Abstract:

Chen Co lake is located at northern slope of the Himalayas. The geographical location of Chen Co lake is 28°53′～28°59′N,90°28′～90°35′E . The maximums of length and width are 11km and 7.8km respectively. The area of lake is about 37km 2. 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 water depth. In laboratory, the time scale was established by 14C and ESR dating. On the basis of core description, grain size distribution, and CaCO 3 content analysis, the sedimentary 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 CaCO 3 content of lacustrine 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 delta also changed among delta front, delta plain and prodelta. Up to now, it presented the nature of delta plain environment. During 17500aBP～14000aBP, 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 sedimentary 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.

Key words: Chen Co lake, lacustrine delta, sedimentary environments, sedimentary facies, lake-level fluctuation

冯金良, 朱立平, 李玉香. 藏南沉错湖泊三角洲的沉积相及沉积环境[J]. 地理研究, 2004, 23(5): 649-656.

FENG Jin-liang, ZHU Li-ping, LI Yu-xiang. Sedimentary environments and facies about Chen Co lacustrine delta, South Tibetan Plateau[J]. GEOGRAPHICAL RESEARCH, 2004, 23(5): 649-656.

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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

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