地质与勘探2024，Vol.60Issue(6)：1183-1195,13.DOI:10.12134/j.dzykt.2024.06.008
郑州地区全新世以来沉积物地球化学风化特征及其古气候意义
Geochemical Weathering Characteristics of Sediments in Zhengzhou Area Since the Holocene and Their Paleoclimatic Significance
摘要
Abstract
The work analyzed the geochemical characteristics of major and trace elements in the Holocene sediments of the Zhengzhou area.Optically stimulated luminescence(OSL)and 14C dating data,A-CN-K diagrams,A-CNK-FM diagrams,chemical weathering index(CIA),alkali reduction coefficient(Be),Na/K value,Rb/Sr value,and Ba/Sr value were utilized to explore the chemical weathering characteristics of sediments and their paleoclimatic significance in Zhengzhou area since the Holocene.The Holocene paleoclimate evolution sequence was reconstructed by the inversion of ancient rainfall and temperature data.Results indicate that the sedimentary profile of the borehole has been in a low chemical weathering stage since the Holocene.The Holocene paleoclimate was relatively stable,overall warm and humid,with an average annual paleorainfall of 639.69 mm and an average annual paleotemperature of 11.78℃.According to the sequence of ancient climate evolution,the Holocene paleoclimate can be divided into four dry and cold events and one warm and humid event.From ancient to modern times,they were the Younger Dryas dry and cold event,8200a BP dry and cold event,6600a BP dry and cold event,4200a BP dry and cold event,and Late Holocene warm and humid climate event.The Younger Dryas dry and cold event had the highest intensity,with ancient rainfall 155.77 mm and ancient temperature 5.49 ℃ lower than those in present-day Zhengzhou,and the late Holocene warm and humid climate event was 282.23 mm and 2.16 ℃ higher than those in present-day Zhengzhou.关键词
全新世/沉积物/化学风化/古气候/郑州地区Key words
Holocene/sediments/chemical weathering/paleoclimate/Zhengzhou area分类
天文与地球科学引用本文复制引用
赵少攀,杨森,张茜,常成,刘念,麻倩倩..郑州地区全新世以来沉积物地球化学风化特征及其古气候意义[J].地质与勘探,2024,60(6):1183-1195,13.基金项目
河南省2020年度自然资源科研项目(编号:2020-6)、河南省2022年度自然资源科研项目(编号:2022-10)、河南省有色金属地质矿产局首批科技创新专项资金项目(编号:KCXM202107)、河南省豫地科技集团有限公司2023年度科技项目(编号:2023-17)和河南省有色金属地质矿产局第一地质大队2022年度"揭榜挂帅"科技创新项目(编号:ysyd2022-03)联合资助. （编号:2020-6）
