地质学报2017，Vol.91Issue(12)：2841-2853,13.
湖北庹家湾剖面释光测年与地层年代学及记录的55ka BP气候变化
OSL Dating of the Tuojiawan Loess-Palaeosol Profile and Climatic Change During the Last 55 ka BP
摘要
Abstract
With the Tuojiawan sediment profile as study objectives,we analyzed their macroscopic structure,sedimentological characteristics and physico-chemical properties,and obtained their formation time using OSL dating.Based on the field observation and indoor laboratory data,this study also established the stratigraphic sequence of the loess-palaeosol in the Upper Reaches of Hanjiang River valley.OSL datingbased stratigraphic chronology study reconstructed the change history of the Upper Reaches of Hangjiang River since the last 55 ka BP.The results suggest that four sequences developed in this area.Terrace Ⅰ of Hangjiang River formed around 55 ka BP,immediately followed by continuous eolian sediments.The stratigraphic palaeosol-loess sequence of the Tuojiawan profile from the bottom to the top includes:loess L1-L3 (55.0～28.5 ka BP)→ palaeosol L1-S2 (28.5～24.5 ka BP)→ L1-L2 (24.5～23.0 ka BP)→ palaeosol L1-S1(23.0～21.0 ka BP)→ L1-L1(21.0～11.5 ka BP)→transitional loess Lt (11.5～8.5 ka BP)→ palaeosol S0 (8.5～3.0 ka BP)→recent loess L0 (3.0～0 ka BP).The Malan loess records four warm-wet periods occurring at 41.0～44.5 ka BP,34.0～37.5 ka BP,24.5～28.5 ka BP and 21.0～24.5 ka BP.Among them,the last two periods gave rise to the formation of palaeosol L1-S2 (370～296 cm) and paleosol L1-S1 (276～230 cm).During the megathermal period (8.5～3.0 ka BP),the upper Hangjiang river was not always the most warm-moist climate since the last glaciation,but intermittently,and relatively transient,relatively cool and wet climate occurred at 5～6 ka BP.关键词
黄土古土壤/地层年代/释光测年/MIS-3/气候变化/汉江上游Key words
Loess-paleosol/stratigraphic chronology/OSL dating/MIS-3/climate change/Hanjing River引用本文复制引用
庞奖励,黄春长,周亚利,查小春,张文桐,崔天宇,毛沛妮..湖北庹家湾剖面释光测年与地层年代学及记录的55ka BP气候变化[J].地质学报,2017,91(12):2841-2853,13.基金项目
本文为国家自然科学基金项目(编号41271108,41371029)、国家社科基金(编号14BZS070)资助的成果. （编号41271108,41371029）
