【摘 要】
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Lake Hovsgol is located in high-altitudinal (1660 m) northern Mongolia which is a southern part of the Baikal Rift Zone formed about 2.5~4 Ma.We collected 20 gravity cores in 2004 to 2006 and 4 box co
【机 构】
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Department of Geology, Kangwon National University, Chuncheon 200-701, South Korea, Republic of Kore
【出 处】
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“东亚欧环境变化过程-亚洲季风变化与高低纬气候相互作用”第八届国际研讨会
论文部分内容阅读
Lake Hovsgol is located in high-altitudinal (1660 m) northern Mongolia which is a southern part of the Baikal Rift Zone formed about 2.5~4 Ma.We collected 20 gravity cores in 2004 to 2006 and 4 box cores in 2009.Among them, HS 5 (124 cm) from the depth 210 m, which was obtained at the south central part of lake has been analyzed for trace elements (Mg/Ca, Sr/Ca, and U/Ca) from benthic ostracods (Cytberissa lacustris and Limnocytbere inopinata).In general, ratios of Mg/Ca and Sr/Ca in ostracods indicate salinity and temperature of the lake water they lived, and ratios of U/Ca in ostracods denotes redox environment of the bottom water of the lake.The three values of trace element ratios from both of ostracods show similar trends of variation, i.e., they show high value in the lowest part of the core and decrease toward the upper part of the core from 100 cm depth and then, they show increase again toward the uppermost part of the core from 30 cm depth.
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