地质论评2013，Vol.59Issue(4)：716-730,15.
贵州草海赵家院子晚更新世泥炭层地球化学特征及其环境意义
Geochemical Characteristics and Sedimentary Environment of the Epipleistocene Peat on Zhaojiayuanzi Sediment Column in Caohai Basin, Guizhou Province
摘要
Abstract
Based on the analytical results of major elements,trace elements and 14C age of the Zhaojiayuanzi sediment column in the Caohai Basin,Weining country,Guizhou Province,China,writers discussed the depositional rate of peat,climatic evolution and provenance from Late Pleistocene to Holocene and the source environment of sediment.The results show that trace elements Li,Sc,V,Cr,Ni,Ga,Rb,Sr,Sn,Cs,Ba,Zr,Th,U et al.are consistent throughout the whole column.14C dating suggests that the age of the basal peat layer in the sediment column is spanned between 33.74 and 23.29 ka BP,and the deposition rates of different layers respectively are 148.4 mm/ka for the bottom peat layer,24.3 mm/ka for the black paleosol,22.4 mm/ka for top layer,so that the deposition rates gradually reduce from the bottom to top.The climate indicators,such as some element ratios (Sr/Ba,Sr/Cu,Rb/Sr,MgO/CaO),and the multi-elements ratios [(CaO + K2O + Na2O)/ A12O3,(Fe2O3 + Al2O3)/(MgO + CaO)] suggest that,during the period from 42.37 ± 1.27 ka BP to 15.60 ± 0.10 ka BP,the ancient climate at ZhaojiaYuanzi area evolved from warm--slight humid →warm--wet →warm--dry →cool--some moist →→cool--moist.The source of sediments has experienced an intense chemical weathering,in which the bottom peat layer,however,was less weathered.关键词
泥炭/元素地球化学/沉积速率/草海/贵州Key words
peat/ element geochemical character/ sediment rate/ the Caohai Basin, Guizhou引用本文复制引用
孔凡翠,杨瑞东,沙占江..贵州草海赵家院子晚更新世泥炭层地球化学特征及其环境意义[J].地质论评,2013,59(4):716-730,15.基金项目
本文为国家科技支撑计划项目课题(编号2011BAC02B02) （编号2011BAC02B02）
教育部"211"重点学科建设基金项目(编号KST200903). （编号KST200903）
