西北地质2024，Vol.57Issue(2)：230-243,14.DOI:10.12401/j.nwg.2023067
张掖盆地晚更新世至中全新世气候变化:孢粉学和重矿物学证据
Climate Changes of Late Pleistocene to Middle Holocene in Zhangye Basin,NW China:Evidence from Pollen and Heavy Mineral
摘要
Abstract
In order to explore the paleoclimatic evolution characteristics and stratigraphic age of Zhangye basin,we reconstructed the climate change characteristics of the study area since the late Pleistocene by means of sporopollen analysis,heavy mineral analysis and optical luminescence dating,and confirmed the stratigraphic boundary between Holocene and late Pleistocene.The results show that the strata are divided into four spore-pollen assemblage zones,the vegetation types and climatic characteristics from bottom to top:① the depth ranges from 56.8 m to 26.4 m(the age is 112.7～63.3 ka),which is the last interglacial period,the spore-pollen assemblage is Pinus-Castanea-Chenopodiaceae-Compositae-Artemisia,coniferous and broad-leaved mixed forest steppe vegetation,which is the warm and humid climate in the late Pleistocene.② the depth ramges from 26.4 m to 2.6 m(the age is 63.3～11.8 ka),which is the last glacial period,the sporepollen assem-blage is Pinus-Ephedra-Chenopodiaceae-Artemisia,and the vegetation type is coniferous and broad-leaved mixed forest steppe vegetation,which is the dry and cold climate of late Pleistocene.③ the depth ranges from 2.6 m to 0.8 m(the age is 11.8～8.9 ka),which is the postglacial,the sporepollen assemblage is Pinus-Chenopo-diaceae-Artemisia,mixed broadleaf-conifer forest steppe vegetation,early Holocene cool and dry climate.④ the depth ranges from 0.8 m to 0.15 m(the age is 8.9～7.8 ka),which is the postglacial,the sporepollen as-semblage is Pinus-Chenopodiaceae-Compositae-Artemisia,broadleaf-conifer mixed forest steppe vegetation,which is the warmer and drier climate of Holocene.The late Pleistocene to mid-Holocene climate evolution characteristics revealed by the spore-pollen assemblages are of great significance for revealing the paleoclimate changes in the Zhangye basin and even the arid area of Northwest China.关键词
张掖盆地/古气候/冰期/孢粉分析/重矿物Key words
Zhangye basin/paleoclimate/glacial period/sporopollen analysis/heavy mineral分类
天文与地球科学引用本文复制引用
赵淼,龚磊,吴玺,蔡五田,张文卿,安永会,李康,刘作鹏..张掖盆地晚更新世至中全新世气候变化:孢粉学和重矿物学证据[J].西北地质,2024,57(2):230-243,14.基金项目
国家重点研发计划专项课题"农田氮素地下淋溶原位监测多参数传感器研发"(2023YFD1701801),中国地质调查局项目"河西走廊黑河流域1∶5万水文地质调查"(121201012000150004). （2023YFD1701801）
