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East-Asian monsoon variability between 15 000 and 2000 cal. yr BP recorded in varved sediments of Lake Sihailongwan (northeastern China, Long Gang volcanic field)

Geo Forschungs Zentrum Potsdam, Telegrafenberg, D-14473 Potsdam, Germany; schet{at}gfz-potsdam.de

Qiang Liu

Institute of Geology and Geophysics, Chinese Academy of Sciences, 100029 Beijing, China

Jens Mingram

Geo Forschungs Zentrum Potsdam, Telegrafenberg, D-14473 Potsdam, Germany

Martina Stebich

Senckenberg Forschungsstation für Quartärpaläontologie, Am Jakobs-kirchhof 4, D-99423 Weimar, Germany

Peter Dulski

Geo Forschungs Zentrum Potsdam, Telegrafenberg, D-14473 Potsdam, Germany

A palaeohydrological reconstruction on decadal scale for the period 15000-2000 cal. yr BP based on calculated net accumulation rates for biogenic silica (F-bSiO₂) and additional proxies (sedimentological data, geochemical sediment characteristics and pollen) is derived from varved sediments of Lake Sihailongwan (SHL). In Lake SHL, F-bSiO₂ is positively correlated with the inflow of nutrient-rich groundwater. Since groundwater inflow is mainly fed by seepage of summer monsoon rainfall, F-bSiO₂ documents changes in summer monsoon strength. Summer monsoon rainfall was enhanced in the early Holocene around 9800 and 7800 cal. yr BP. Groundwater inflow during these periods did not reach the high level of the Lateglacial warm period (c. 14300 12500 cal. yr BP) when the vicinity of the lake was less densely covered with woody vegetation than in the Holocene. Aeolian influx of silt-sized debris was relatively higher during an overall drier period between 9500 and 8000 cal. yr BP. A mid-Holocene sedimentation interval with distinct century-scale variability in summer monsoon rainfall documents a positive correlation between rainfall and siliciclastic influx that reflects a more efficient removal of mineral aerosols for increased rainfall at an overall high dust concentration over the Asian continent. Summer monsoon rainfall reached minima around 6400, 4900, 3700 and 2200 cal. yr BP. Remarkably, aeolian siliciclastic influx peaked at the beginning and at the end of a dry interval between 4100 and 3600 cal. yr BP. Around 3600 cal. yr BP Lake SHL received substantial aeolian influx of different geochemical provenance.

Key Words: Palaeoclimate • East-Asian monsoon • lacustrine sediments • sediment geochemistry

The Holocene, Vol. 16, No. 8, 1043-1057 (2006)
DOI: 10.1177/0959683606069388


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