Nihewan basin is famous for its lacustrine deposits, animal fauna and occupied evidence of early humans. All of the discovered Palaeolithic sites are distributed along ancient lakeside or on the terraces of the Sangga...Nihewan basin is famous for its lacustrine deposits, animal fauna and occupied evidence of early humans. All of the discovered Palaeolithic sites are distributed along ancient lakeside or on the terraces of the Sangganhe river and its tributaries. However, the authors discovered a stone flake from the central part of the ancient Nihewan lake in an outcrop section on the right bank of the Sangganhe river. The location is 40°06′33″N and 114°20′15″E, near Jinerwa village, Yangyuan County, Heibei Province. The flake is basaltic and has a size of 4.5 cm×3.2 cm×1.7 cm. Its ventral surface is a fresh plane of fracture with a clear point of percussion,a bulb and a bulbar scar on it. The dorsal surface is composed of a residual part of a rounded pebble surface and a fresh plane formed along a joint. The flake is unearthed at 50.73 m under the lacustrine platform surface in perfectly laminated beds of Mid-Pleistocene. The feafures of the flake do not rule out the possibility of natural origin. But combined with the sedimentary features of the horizon where it is unearthed, the most reasonable explanation is that the flake may be the trace of ancient human activities on the frozen lake of Nihewan.展开更多
Samples were collected from two core sediments(C1 and C2) of Xiangjiang River,Chang-Zhu-Tan region,Hunan Province,China.The heavy metal contents are relatively higher,especially for the surface or near the surface lay...Samples were collected from two core sediments(C1 and C2) of Xiangjiang River,Chang-Zhu-Tan region,Hunan Province,China.The heavy metal contents are relatively higher,especially for the surface or near the surface layers.The calculated anthropogenic factor values indicate that all the heavy metals except for Cr in the core samples are enriched,especially for Cd,with the maximum enriching coefficients of 119.44,and 84.67 in C1 and C2,respectively.The correlation of heavy metals with sulphur indicates that they are precipitated as metal sulphides.Correlation matrix shows significant association between heavy metals and mud.Factor analysis identifies that signified anthropogenic activities affect the region of Xiangjiang River.展开更多
文摘Nihewan basin is famous for its lacustrine deposits, animal fauna and occupied evidence of early humans. All of the discovered Palaeolithic sites are distributed along ancient lakeside or on the terraces of the Sangganhe river and its tributaries. However, the authors discovered a stone flake from the central part of the ancient Nihewan lake in an outcrop section on the right bank of the Sangganhe river. The location is 40°06′33″N and 114°20′15″E, near Jinerwa village, Yangyuan County, Heibei Province. The flake is basaltic and has a size of 4.5 cm×3.2 cm×1.7 cm. Its ventral surface is a fresh plane of fracture with a clear point of percussion,a bulb and a bulbar scar on it. The dorsal surface is composed of a residual part of a rounded pebble surface and a fresh plane formed along a joint. The flake is unearthed at 50.73 m under the lacustrine platform surface in perfectly laminated beds of Mid-Pleistocene. The feafures of the flake do not rule out the possibility of natural origin. But combined with the sedimentary features of the horizon where it is unearthed, the most reasonable explanation is that the flake may be the trace of ancient human activities on the frozen lake of Nihewan.
基金Project(1212010) supported by the China Geological Survey for Ecosystem Geochemistry Assessment in City of Changsha,Zhuzhou and Xiangtan
文摘Samples were collected from two core sediments(C1 and C2) of Xiangjiang River,Chang-Zhu-Tan region,Hunan Province,China.The heavy metal contents are relatively higher,especially for the surface or near the surface layers.The calculated anthropogenic factor values indicate that all the heavy metals except for Cr in the core samples are enriched,especially for Cd,with the maximum enriching coefficients of 119.44,and 84.67 in C1 and C2,respectively.The correlation of heavy metals with sulphur indicates that they are precipitated as metal sulphides.Correlation matrix shows significant association between heavy metals and mud.Factor analysis identifies that signified anthropogenic activities affect the region of Xiangjiang River.
