土壤学报2012，Vol.49Issue(2)：246-259,14.
末次间冰期以来临夏地区气候变化的黏土矿物学及地球化学记录
CLAY MINERALOGICAL AND GEOCHEMICAL RECORDS OF PALEOCLIMATE IN LINXIA SINCE THE LAST INTERGLACIAL
摘要
Abstract
Clay mineralogical and chemical elements analyses of the loess-paloesol deposit of Tawan Profile in Linxia Basin indicated that the climate of Linxia experienced a four-phase alteration, I. E. Relatively warm/humid (92.4 ~78. 8 ka) -cold/arid (78.8 ~59.8 ka) -relatively warm/humid (59.8 ~47.7 ka) -cold/arid (47. 7 ka to present) since the last interglacial period. The loess-paleosol deposit of the profile was dominated with illite, chlorite, mixed layer illite-smectite and minor palygorskite. Palygorskite was ubiquitous in the sediment, suggesting that on the whole the region was relatively arid throughout the period. W( TiO2 )/w( A12O3 ) ratio of the loess-paleosol deposits indicated of the same origin. The loess-paleosol alternation was attributed to different weathering intensities, which were closely related to rainfall and temperature conditions in the period. Relative proportions of clay minerals, CIA values, w ( A12O3 )/w ( Fe2O3 ) , w( SiO2 )/w( A12O3) , w( SiO2 )/w( Fe2O3 ) and w( MgO)/w( A12O3 ) varied quite sharply during the warm and humid period , but rather stable during the cold and arid period. The variation of the clay mineralogical features and major elements indicated significant cooling events occurred at the period of 92. 4 ~ 78. 8 ka and 47. 7 ka ~ present, suggesting unstability of the climate environment in Linxia since the last interglacial period, which was probably related to the winter and summer monsoons in the plateau.关键词
临夏盆地/末次间冰期/黄土-古土壤/黏土矿物学/常量元素/气候环境Key words
Linxia basin/ Last interglacial period/ Loess-paleosols/ Clay mineralogy/ Major elements/ Climatic environment分类
农业科技引用本文复制引用
殷科,洪汉烈,高文鹏,梁国军,王朝文,张克信,宋鄂平..末次间冰期以来临夏地区气候变化的黏土矿物学及地球化学记录[J].土壤学报,2012,49(2):246-259,14.基金项目
青藏高原新近纪隆升过程与地质事件群研究项目(1212011121261)和国家自然科学基金项目(41072030、40872038)资助 （1212011121261）
