Abstract Middle-east of Inner Mongolia,located in the transitional region of East Asian Summer Monsoon,is sensitive to climate changes. Widely scattered lake sediments provide ideal materials for studying environment changes since the Holocene. Lakeshore sediment, recording the paleolake level directly, could help us understanding the paleoclimate history and reconstructing lake level fluctuations quantitatively combined with high-resolution lake center records. AMS 14C dating,GPS,DEM and 1︰50000 topographic map methods were applied to investigate the chronology and elevation of lakeshore in the north of Dali Lake. Combined with the sedimentary sequences,the lake level history since 12.5 cal ka BP was reconstructed. The lake level was 1253,m at 12.5 cal ka BP followed by a short duration of transgression until 12.3 calka BP (1266 m) and then began to decline. In early Holocene at 11.2 cal ka BP,the lake level was at 1254,m and showed a rise tendency till 10.7 cal ka BP at 1274,m. Up to mid-Holocene, the lake level continued to rise(at least 1291,m). In late Holocene at 4.8 calka BP,the level fell to 1279,m and then to 1275,m at 4.6 cal ka BP. By comparing with the records of Dali Lake core and other regional lakes,we considered that the lake level fluctuations were consistent with the regional pattern possibly controlled by the East Asian Monsoon. Moreover,the intense lake level fluctuations of the Dali Lake may also be affected by both the regional tectonic activity during late Holocene and drainage system changes caused by head-ward erosion of the Xilamulun River.
Fund:[Funded by Geological Investigation Projects of China Geological Survey(No.12120113005600)]
Corresponding Authors:
Wang Yong,born in 1968,is a senior researcher of Geological Institute, Chinese Academy of Geological Sciences. He is currently engaged in researches on Quaternary geology and neotectonics. E-mail: wangyong@cags.ac.cn.
About author: Liu Jin,born in 1987,is a Ph.D. candidate in Chinese Academy of Geological Sciences and China University of Geosciences(Beijing). She is currently engaged in palaeoenvironment and palaeoclimate reconstruction since late Quaternary. E-mail: liujin_1203@126.com.
Cite this article:
Liu Jin,Wang Yong,Li Tingdong et al. Lake level fluctuations since 12.5 calka BP recorded by lakeshores of the Dali Lake in middle-east of Inner Mongolia[J]. JOPC, 2016, 18(6): 1044-1052.
Liu Jin,Wang Yong,Li Tingdong et al. Lake level fluctuations since 12.5 calka BP recorded by lakeshores of the Dali Lake in middle-east of Inner Mongolia[J]. JOPC, 2016, 18(6): 1044-1052.
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