Study on OSL Dating of Sediment Stratigraphy on the First River Terrace in Danjiang River Valley
Wang Leibin
Zhou Yali
Pang Jiangli
Huang Chunchang
Zha Xiaochun
Gao Pengkun
Abstract：The extensive and careful fieldwork was carried out on the first river terrace in Danjiang River valley.The typical loess -paleosol sedimentary sequence in Chafang Village of Danfeng County from top to bottom was as follows:surface soil layer (TS )-loess layer (L0 )-weak paleosol layer (S0 -upper)-loess lay-er (Lx )-paleosol layer (S0 -lower)-transitional loess layer (Lt )-Malan loess layer (L1 )-alluvial flat faci-es sand gravel layer (T1 -al ).The quartz grains of 90 ~125 μm was choosed to detect the stratigraphic age by single aliquot regeneration (SAR)of OSL dating technique.The sedimentary sequences from bottom to top were as follow.The upper limit was S0 -lower of 6.16 ±0.12 ka,Lx of 5.86 ±0.14 ka,S0 -lower of 4.83 ± 0.12 ~2.51 ±0.17 ka,L0 of 1.94 ±0.07 ka.Combined with the physical and chemical data,the analysis results showed that at Holocene Megathermal period (6.16 ka),the climate was warm and moist with good developement soil and density vegetation in the south of Qinling Moutain.Around 5.86 ±0.14 ka,the climate was arid and cold and the typical loess was developed.At 4.83 ±0.12 ka,the climate was warm and moist and the weak paleosol was developed.From 1.94 ka,the climate was arid and cold and the loess was devel-oped.The paleosol layer developed about 2.5 ka,which was later than the ending deadline of Holocene Megathermal period of around 3 ka in the Loess Plateau.The cold event of 5.86 ka was one of the rapid cool-ing climate event and regional response of climate fluctuate.
Keywords：Danjiang RiverFirst terraceOSL ageClimatic change
Publication Date：2015-01-01
Online Publishing Date：2026-05-22(First online date of this platform, not the publication date of the document)
Pages：8( 75-82 )