Lacustrine strata sedimentology and lake-level history in ancient Zhuyeze Lake since the Last Deglaciation |
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| Authors: | Qiang Zhao Nai&#;ang Wang and Xiumei Li |
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| Institution: | (1) Centre for East Asian Archaeological Studies, Shandong University, Jinan, 250100, China;(2) School of City and Development, University of Jinan, Jinan, 250002, China;(3) School of Resources and Environment, Lanzhou University, Lanzhou, 730000, China |
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| Abstract: | The ancient Zhuyeze Lake lies in the east Hexi corridor of Northwest China and it is the interacting belt of the East Asian
summer monsoon and the westerly line. The research on paleoclimate of the lake facilitates the understanding of the processes
and mechanism of climate change in Northwest China since the Last Deglaciation. Related researches of this area started in
the 1960s, and the research on environment changes has become the “hotspot” during the last 10 years. This paper focuses on
four sections (Qingtuhu Section, Xiqu Section, Shakengjing Section, Jiutuoliang Section) in ancient Zhuyeze Lake. Much work
was done in spot investigation, section strata comparison, geophysical analyses, geochemical analyses and dependable 14C dating in order to retrieve the dry-wet history of climate changes in ancient Zhuyeze Lake since the Last Deglaciation.
The main conclusions are as follows: (1) the highest terminal lake level was 1313–1315 m. In Holocene, the highest lake level
was 1308–1309 m occurring between 6700–5800 a B.P.. (2) After geophysical and geochemical analyses, high-resolution records
of the climate change since the Last Deglaciation were revealed as follows: cold and dry during 15800–13000 a B.P.; cool and
wet during 13000–9500 a B.P.; warm and dry during 9500–6700 a B.P.; warm and wet during 6700–4300 a B.P.; cool and wet during
4300–2700 a B.P.; and at last dry during 2700-0 a B.P..
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Translated from Journal of Arid Land Resources and Environment, 2007, 21(12): 161–169 译自: 干旱区资源与环境] |
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| Keywords: | ancient Zhuyeze Lake lacustrine strata sedimentology environment changes |
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