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Climatic stages recorded in sediments of the Gunang Cave, South Korea
Kim, J.Y.,Krivonogov, S.K.,Lee, Y.J.,Woo, J.Y.,Oh, K.C.,Yang, D.Y.,Kim, J.C.,Safonova, I.Y.,Yamamoto, M. Pergamon Press 2013 Quaternary international Vol.313 No.-
This paper presents and analyses lithological, stratigraphic and geochronological data on the Gunang cave, which is an important archaeological site in South Korea. It discusses problems of the age and origin of its sedimentary sequence, which consists of clastics and hardpan speleothems. The sediments compose a 4 m thick lens near the cave entrance. The lens formed during the Middle-Late Pleistocene and Holocene according to <SUP>14</SUP>C and U-Th dating. The changes of cave environments are reconstructed based on sedimentological, palynological, mineralogical, magnetic and geochemical data. The clastic sediment unit consists of roof-fallen limestone debris cemented by fine-grained matrix. The matrix is dominated by silt (80%), which aeolian component is 60-65%. The amount of the wind-blown component is persistent throughout the clastic layers suggesting a relatively stable depositional process in dry environment. In contrast, three lime-cemented hardpans formed in a wet environment of groundwater seepage. The revised age model suggests that the hardpans formed in early MIS1, MIS 5.5, and MIS 7, and therefore correspond to the wetness maximums of these warm stages.
어르헌셀렌게,카시와야,오치아이,크리워너거브,나카무라,Orkhonselenge, A.,Kashiwaya, K.,Ochiai, S.,Krivonogov, S.K.,Nakamura, T. 한국제4기학회 2008 제사기학회지 Vol.22 No.1
The present study has focused on the environmental changes and evidences for sedimentation in the Lake Khuvsgul catchment during the Holocene period, inferred from short core sediment (BO03) from the eastern shore of Borsog Bay, which were analyzed in order to review records of the Holocene climatic evolution and Holocene history in Northern Mongolia. For the purpose of reconstruction of natural phenomenon that occurred in the lake catchment system during the Holocene, physical and chemical properties including HCl-soluble material, biogenic silica, organic matter and grain size distribution of minerals in the core sediments have been analyzed in this study. The vertical variations in composition for these properties show distinctly that five lines of paleoenvironmental evidence occurred in the lake catchment during the Holocene. A modified age model resulting from AMS carbon dating for the BO03 core sediment shows timings of these environmental events at 9.5 Kyr BP, 8.0 Kyr BP, 5.6 Kyr BP and 3.2 Kyr BP, respectively. Paleoenvironmental changes in the Lake Khuvsgul catchment system during the Holocene highlight distinctive features of the hydrological regime and geomorphologic evolution in the lake catchment due to regional landscape and global climatic changes corresponding with the Holocene optimum and thermal optimum. In particular, the change of hydrologic regime based on the sedimentological evidence has been caused by not only overland flow due to melting water, but also base flow due to thick permafrost around Khuvsgul region.