摘要
可靠的年代学框架是考古学研究的基础,然而考古遗址的沉积过程通常比较复杂,这可能会对光释光测年造成很大的问题。本研究利用石英单片再生剂量法对江西上湖遗址的6个样品进行了光释光年代测定,通过不同粒径石英测年结果的对比分析上湖遗址样品的释光特性和晒退程度,并为遗址文化层提供初步的年代结果。(1)基于三个样品进行了不同粒径(大测片)石英光释光测年结果对比,可知4~11、38~63和63~90μm三个组分的光释光年龄范围分别在50~63、67~78和71~94 ka。(2)对所有样品的粗颗粒(63~90μm)进行的小测片测试结果非常离散,这表明样品存在晒退不均匀的问题;据最小年龄模型计算得到SH01-06的年龄结果分别为:4.1±0.9、6.8±1.9、32±4、47±8、28±4和28±4 ka,比不同粒径的大测片结果更加年轻,表明所有粒径组分均存在信号晒退问题。(3)研究初步确立了上湖遗址古人类活动的时间在距今30 ka左右,晚于47 ka,但该年龄结果仍然可能被高估。
A reliable chronological framework is essential for Paleolithic archaeological research,how-ever,complex depositional process may cause significant uncertainties in Optically Stimulated lumines-cence(OSL)dating.Six OSL samples from the cultural layer of the Shanghu site were dated using single-aliquot regenerative protocol,to analyze the luminescence characteristics and evaluate the signal bleaching by comparing the OSL ages of different grain-size fractions,and to provide time estimation for early human activities.Comparisons among OSL ages of three grain-size fractions(medium or large aliquot)were made based on three samples,and the ages of 4~11,38~63,63~90μm range at 50~63,67~78,71~94 ka,respectively.Then small aliquot was applied to the coarse fraction of all the six samples.Their diverse equivalent doses demonstrate the sediments were insufficiently bleached,and the ages of SH01 to SH06 were calculated by minimal age model as 4.1±0.9,6.8±1.9,32±4,47±8,28±4 and 28±4 ka,respectively.These ages based on small aliquot are much younger than the results from medium or large aliquot,demon-strating that all the fine,medium and coarse fractions of sediments in this site were poorly bleached.The minimal ages of coarse-grained fraction suggest the prehistoric human occupied this region since 30 ka,no early than 47 ka.However,this time estimation might be still overestimated.
作者
刘剑刚
文欢
于禄鹏
安萍
王昌盛
李浩
LIU Jiangang;WEN Huan;YU Lupeng;AN Ping;WANG Changsheng;LI Hao(School of Geography,Liaoning Normal University,Dalian,116000,China;Luminescence Research Laboratory,Shandong Provincial Key Laboratory of Water and Soil Conservation&Environmental Protection,School of Resource and Environmental Sciences,Linyi University,Linyi,276000,China;State Key Laboratory of Tibetan Plateau Earth System,Resources and Environment(TPESRE),Institute of Tibetan Plateau Research,Chinese Academy of Sciences,Beijing,100101,China)
出处
《盐湖研究》
CAS
CSCD
2024年第4期25-31,共7页
Journal of Salt Lake Research
基金
国家自然科学基金项目(41761144073,41988101)
山东省高等学校“青创人才引育计划”建设团队项目(鲁教科函2021-51)。
