Climato-hydrological fluctuations printed in long lacustrine records in Lake Hovsgol, Mongolia

A provisional age model is proposed for HDP-04 sedimentary records from Lake Hovsgol on the Mongolian Plateau of a middle-latitude zone during the Brunhes epoch. The model is established on the basis of two procedures; first age model (linear age model) with some dates (C-14, U-238-U-234-Th-230 and paleomagnetic events) and a second age model with auto-orbital tuning for the first age model. The age model suggests that the MIS-1 to MIS-7 interval is included in the upper part and the MIS-11 to MIS-19 is included in the lower part, in addition to the missing part of about 100 ky. The glacial interglacial cycle is most clearly presented by aridity (water level change): three Milankovitch parameters (precession, obliquity and eccentricity) are detected in most datasets. Grain size is, occasionally, large in glacial intervals and small in interglacial ones in the upper part (above the hiatus), possibly related to material mobility with water level change (change in erosion area) and wind availability. A deep depression (cold stage comparable to glacial periods), corresponded to an insolation minimum, is detected at about the MIS-5d in records, indicating that this region is highly sensitive to solar insolation. Another depression found during the MIS-11 interval also corresponded to a small insolation minimum, showing that the interval was not a simple prolonged interglacial period. (C) 2010 Elsevier Ltd and INQUA. All rights reserved.