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Environmental evolution of Xingkai (Khanka) Lake since 200 ka by OSL dating of sand hills
  • ISSN号:1001-6538
  • 期刊名称:科学通报(英文版)
  • 时间:0
  • 页码:2604-2612
  • 语言:中文
  • 分类:P533[天文地球—古生物学与地层学;天文地球—地质学] TV148.1[水利工程—水力学及河流动力学]
  • 作者机构:[1]Key Laboratory of Lake Science and Environmentl Nanjing Institute of Geography and Limnology, Chinese Academy of Sciences, Nanjing 210008, China, [2]College of Geographical Sciences, Fujian Normal University, Fujian Key Laboratory of Subtropical Resources and Environment, Fuzhou 350007, China
  • 相关基金:We thank Profs. Zhao Hua and Wang Chengmin for the OSL measurement. Special thanks are given to the editors and reviewers for their constructive advice. This work was supported by the National Natural Science Foundation of China (40872117).
  • 相关项目:兴凯湖沉积岩芯记录的末次盛冰期以来中高纬季风区气候演化特征
中文摘要:

穿过中国俄语的边界,克辛凯·莱克是在东北亚洲的最大的淡水湖。除了湖岸,在持续、稳定的湖的违反的一个时期期间积累了并且在消沉以后被保存的湖的北方方面上有四座沙山。基于 18 OSL , datings 在沙山与六个地点的多重索引分析相结合的标明日期得好的 stratigraphic 序列的分析表明自从中间,克辛凯·莱克的北方海岸线以一种逐步的方式撤退了更新世,和那至少四违反(在 193-183 ka 期间, 136-130 ka , 24-15 ka 并且自从 3 ka )并且三消沉发生在这个过程期间。这研究的结果证实 transgressive 阶段与气候冷却的时代是并发的,而回归的时期对应于气候的 optima。违反和回归被变化首先在被气候的变化控制的地区性的温度和湿度在乌苏里江河山谷和变化在冲积累积的紧张引起。而且,发生在 MIS3 的一个明显的 transgressive 过程可能与在中国的西方据说是普遍的提高的降水有关,当在湖的短期的变化铺平力量很好时,是对千年的规模上的地区性的降水变化的直接回答。

英文摘要:

Crossing the Sino-Russian boundary, Xingkai Lake is the largest freshwater lake in Northeast Asia. In addition to the lakeshore, there are four sand hills on the north side of the lake that accumulated during a period of sustainable and stable lacustrine transgression and were preserved after depression. Analysis of well-dated stratigraphic sequences based on 18 OSL datings combined with multiple index analysis of six sites in the sand hills revealed that the north shoreline of Xingkai Lake retreated in a stepwise fashion since the middle Pleistocene, and that at least four transgressions (during 193-183 ka, 136-130 ka, 24-15 ka and since 3 ka) and three depressions occurred during this process. The results of this study confirmed that transgressive stages were concur- rent with epochs of climate cooling, whereas the period of regression corresponded to the climatic optima. Transgressions and regressions were primarily caused by variations in the intensity of alluvial accumulation in the Ussuri River Valley and fluctua- tions in regional temperature and humidity that were controlled by climatic change. Moreover, one obvious transgressive process that occurred in MIS3 may have been related to enhanced precipitation that was reportedly widespread in the west of China, while short-term fluctuations in the lake level might well be a direct response to regional precipitation variations on the millennial scale.

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