The grain-size characteristics of Quaternary deposits at Xingshan near Siping in Jilin province, China

作     者：Maxwell A Boateng 

作者机构：College of Earth Sciences Jilin University Changchun 130061 Jilin China 

出 版 物：《Global Geology》 (世界地质（英文版）)

年 卷 期：2006年第9卷第1期

页      面：30-39,48页

学科分类：070905[理学-第四纪地质学] 0709[理学-地质学] 07[理学] 

主　　题：grain-size characteristics Xingshan Quaternary deposits Pleistocene interglacial period 

摘      要：This research paper analyses the grain-size characteristics of the Quaternary deposits at Xingshan near Siping, Jilin province in China by employing graphic measures to study the grain size distribution and its mode of transport and deposition. The Quaternary deposits at Xingshan lie unconformable on Cretaceous rocks made of siltstone, mudstone and sandstone. The average grain size is between 8.06 to 8.55Φ (0.002 6 ～0.003 7 mm). The Quaternary deposits at Xingshan mainly compose of very fine silt to clay. The compositions of the grade are clay 63% and silt 37%. The clay size components are weathered debris transported and deposited by flowing water from the SE highlands or hills to the low lying NW Xingshan plains whereas the silty components accumulated by aoelian process. The Quaternary deposits at Xingshan accumulated in the middle and late Pleistocene interglacial periods from (459.12～39.03) ka to (88.92～7.56) ka. The standard deviation ranged from 0.96 to 1.36Φ, indicating that the sediments are moderately to poorly sorted, Coefficient of skewness ranged from 0.16～0.31 with an average skewness of 0.218, (Positively skewed towards fine). Kurtosis values (0.84～1.05) from the grain size distribution and visual inspection of the frequency curves indicate platykurtic to mesokurtic curves and unimodal to bimodal grain-size distribution. The type of deposit formation is sand dune and the source is at a distal from its provenance.