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- Title
Early to mid-Holocene lake high-stand sediments at Lake Donggi Cona, northeastern Tibetan Plateau, China.
- Authors
Dietze, Elisabeth; Wünnemann, Bernd; Hartmann, Kai; Diekmann, Bernhard; Jin, Huijun; Stauch, Georg; Yang, Sizhong; Lehmkuhl, Frank
- Abstract
Abstract: Lake high-stand sediments are found in three onshore terraces at Lake Donggi Cona, northeastern Tibetan Plateau, and reveal characteristics of hydrological changes on lake shorelines triggered by climate change, geomorphological processes, and neo-tectonic movements. The terraces consist of fluvial–alluvial to littoral-lacustrine facies. End-member modeling of grain-size distributions allowed quantification of sediment transport processes and relative lake levels during times of deposition. Radiocarbon dating revealed higher than modern lake levels during the early and mid Holocene. Lake levels follow the trend of Asian monsoon dynamics, and are modified by local non-climatic drivers. Site-specific impacts explain fluctuations during the initial lake-level rise ~11calka BP. Maximum lake extension reached ~9.2calka BP, at ~16.5m above present lake level (a.p.l.l.). Littoral and lacustrine sediment deposition paused during a phase of fluvial activity and post-depositional cryoturbations at ~8.5calka BP, when the lake level fell to ~8m a.p.l.l. After a second maximum at ~7.5calka BP, lake level declined slightly at ~6.8calka BP, probably due to a non-climatic pulse that caused lake opening. The level remained high until a transition towards drier conditions ~4.7calka BP. Though discontinuous, high-stand sediments provide a unique, high-resolution archive.
- Subjects
TIBETAN Plateau; LAKE sediments; HOLOCENE Epoch; TERRACES (Geology); CLIMATE change; LAKE hydrology
- Publication
Quaternary Research, 2013, Vol 79, Issue 3, p325
- ISSN
0033-5894
- Publication type
Article
- DOI
10.1016/j.yqres.2012.12.008