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Impact-induced and diagenetic changes in minerals in the sandy ejecta of the Kärdla crater,NW Estonia
impact craters ejecta shock metamorphism C-rich particles stable carbon isotopes
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2009/10/22
The sand-rich ejecta containing a considerable amount of mineral grains with impact-induced features was studied in five boreholes drilled around the Kärdla impact meteorite structure. Quartz gra...
Sedimentary record of heavy metals in Lake Rõuge Liinjärv,southern Estonia
heavy metals 210Pb dating sediments Lake Rõ uge Liinjä rv
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2009/10/21
Anthropogenic impact on Lake Liinjärv (Rõuge, southern Estonia) was studied back to the mid-19th century on the basis of heavy metals (Pb, Cu, Zn, Mn, and Hg) and geochemical parameters of...
Litorina Sea sediments of ancient Vääna Lagoon,northwestern Estonia
Litorina Sea transgression diatoms pollen radiocarbon dating Vä ä na Lagoon
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2009/10/21
Vääna Lagoon (59°22′30″N, 24°25′00″E) is located 25 km west of Tallinn in ancient Vääna Klint Bay at a 22 m Litorina Sea isobase. Lagoonal deposits were reinvestigated and new resu...
Thallophytic algal flora from a new Silurian Lagerstätte
Silurian Konservat-Lagerstä tte thallophytic algae Estonia
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2009/10/21
Algae have always been the most diverse and numerous eukaryotic autotrophs in marine ecosystems. Both fossil and molecular data point to an early Proterozoic origin for algae. Although known for their...
Palaeolimnological assessment of environmental change over the last two centuries in oligotrophic Lake Nohipalu Valgjärv,southern Estonia
lake sediment diatoms 210Pb chronology reference conditions Lake Nohipalu Valgjä rv
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2009/10/21
The main objectives of this study were to reconstruct the environmental conditions for a small oligotrophic lake during the last two centuries, to determine if the environment of the lake was anthropo...
用单轴抗压强度试验分析瑞典Äspö 废物罐回取试验中的岩石损伤
高放废物 废物罐回取试验 单轴抗压强度试验 最大裂隙体积应变 损伤
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2009/4/20
废物回取试验是一个在瑞典Äspö 地下实验室完成的,历时近5 a,为全尺寸处置库模拟加热试验。试验在一个直径f 1.75 m、深度8.5 m的钻孔中进行。开挖和加热后周边岩石中的温度升高、应力改变,因此,试验中岩石中可能产生的损伤是工程设计中关心的课题之一。为此,试验结束后,在试验孔3个不同深度处沿垂直和平行于最大主应力方向施打6个深度约1.5 m的近水平取样孔,并采集了12组...