摘要
西藏拉萨昌果沟遗址位于雅鲁藏布江中游支流的阶地上,是重要的新石器时代遗址.为探讨昌果沟遗址附近的古环境,对遗址附近开展地貌调查,在遗址北面约1 km处选取1个全新世风成沉积剖面进行光释光测年和环境指标分析,在雅鲁藏布江中游选2个阶地剖面进行光释光测年分析;此外,还总结了雅鲁藏布江中游23个全新世古土壤/泥炭的测年数据,进行概率密度分析,试图揭示区域的环境演化特征.研究表明:全新世古土壤/泥炭年代的概率密度可以较好地反映区域气候变化,9.0~6.0 ka古土壤/泥炭发育在波动中增强,气候由冷干向暖湿转换;6.0~2.9 ka古土壤/泥炭发育最强,气候相对温干;2.9 ka后鲜有古土壤/泥炭发育,气候变得冷干,史前人类活动受限.4.5 ka之后雅鲁藏布江中游及其支流一级阶地的形成为新石器时期先民提供农业耕作的场所,古土壤的发育为农作物提供了丰富的营养.1.4~1.1 ka期间(吐蕃王朝时期)局部地区有古土壤发育,气候好转.
Changguogou site(3200 a B.P.),an important Neolithic site,is located in south of Lhasa(Tibet).The site is located on a terrace of the Changguogou tributary in the middle reaches of the Yarlung Zangbo River.The site and its surroundings are covered with shifting sand.In order to explore the paleoenvironment of the Changguogou site and its surrounding area,this paper carried out geomorphic investigation around the site and the valley in the middle reaches of the Yarlung Zangbo River.CGG aeolian sedimentary profile(29°21′55.2″N,91°08′56.7″E;3666 m a.s.l.)located ca.1 km north of the site was selected for optically stimulated luminescence(OSL)dating and environmental proxy analysis.JDX profile(29°17′08.8″N,91°09′13.1″E;3570 m a.s.l.)and ZXT profile(28°59′38.3″N,93°16′29.8″E;3054 m a.s.l.)from terrace in the middle reaches of the Yarlung Zangbo River were selected for OSL dating.In addition,23 dates from Holocene paleosol/peat layers in the middle reaches of the Yarlung Zangbo River were summarized,and the probability density analysis was conducted to reveal the regional climate evolution.Our results show that,the probability density of Holocene paleosol/peat dates can well reflect regional climate change.From 9.0~6.0 ka,the development of paleosol/peat was mainly in a fluctuating growth trend,indicating that the climate turned to warm and wet;from 6.0~2.9 ka,paleosols'development reached its peak and the climate was relatively warm and dry;after 2.9 ka,the climate became drier and colder,the development of paleosols weakened and the prehistoric human activities were limited.The OSL dating results of three profiles and environmental proxy analysis of CGG profile showed,the first terrace of the middle reaches of Yarlung Zangbo River and its tributary was formed after 4.5 ka,which could provide an ideal place for the agricultural activities of the Neolithic ancestors,and develop paleosols provided suitable nutrition for crops.Paleosol developed at some places during the Tubo Dynasty period(1.4~1.1 ka),when the climate improved.
作者
李拓宇
任小林
廖奕楠
莫多闻
鄂崇毅
鲁鹏
许俊杰
伍永秋
杜世松
Li Tuoyu;Ren Xiaolin;Liao Yinan;Mo Duowen;E Chongyi;Lu Peng;Xu Junjie;Wu Yongqiu;Du Shisong(Editorial Department of Journal of Capital Normal University,Beijing 100048;Key Laboratory of Cenozoic Geology and Environment,Institute of Geology and Geophysics,Chinese Academy of Sciences,Beijing 100029;College of Urban and Environmental Sciences,Peking University,Beijing 100871;Qinghai Provincial Key Laboratory of Physical Geography and Environmental Processes,School of Geography Sciences,Qinghai Normal University,Xining 810008,Qinghai;Institute of Geographical Science,Henan Academy of Sciences,Zhengzhou 450052,Henan;School of History,Zhengzhou University,Zhengzhou 450001,Henan;State Key Laboratory of Earth Surface Processes and Resource Ecology,Beijing Normal University,Beijing 100875)
出处
《第四纪研究》
CAS
CSCD
北大核心
2020年第2期547-555,共9页
Quaternary Sciences
基金
国家自然科学基金项目(批准号:41601191)
国家重点基础研究发展计划项目(批准号:2013CB956001)
国家社科基金重大项目(批准号:11&ZD183)
河南省特聘研究员项目共同资助。
关键词
雅鲁藏布江
昌果沟遗址
阶地
概率密度函数
古环境
the Yarlung Zangbo River
Changguogou site
terrace
probability density
paleoenvironment
作者简介
第一作者:李拓宇,女,35岁,副编审,环境考古研究,E-mail:lituoyu@cnu.edu.cn。
