河南嵩山东麓邓家剖面元素的地球化学特征及环境意义  

ELEMENTS DISTRIBUTION OF THE DENGJIA LOESS SECTION,CENTRAL HENAN AND ITS ENVIRONMENTAL IMPLICATIONS

作　　者：杨瑞霞[1,2] 李志飞[1,2] 张莉[1,2] 鲁鹏[1,2] 高红丽[2] 

机构地区：[1]河南省遥感与GIS重点实验室,郑州450052 [2]河南省科学院地理研究所,郑州450052

出　　处：《海洋地质与第四纪地质》2011年第2期129-134,共6页Marine Geology & Quaternary Geology

基　　金：国家自然科学基金项目(40371110;41001124)

摘　　要：通过对河南嵩山东麓双洎河二级河流阶地XD剖面元素Mg、Fe、K、Mn、Ba、Sr及CaCO3、SiO2的百分含量分析,结合OSL定年及元素分布特征与环境意义,认为该区域土壤发育与气候变化关系密切。分析还发现本区末次冰消期以来存在两次变湿(16、9kaBP)与两次变干(12、2kaBP)时期;Ca/Mg与粒度联系较紧,可以作为古气候的代用指标;全新世大暖期前期的淋溶作用要强于后期;综合分析认为末次冰消期以来,该区气候经历了冷干-冷湿-冷干-暖湿-暖干这样一种区域气候变化过程。A loess-paleosol sedtion formed since the last deglaciation was discovered at Dengjia,Xinzheng county,Henan Province.The distributions of Mg、Fe、K、Mn、Ba、Sr and CaCO3、SiO2 are studied in details.Results show that the evolution of loess deposits was closely related with climate changes.During the last deglaciation,there were two humid periods in 16kaBP and 9 kaBP,and two arid periods in12 kaBP and 2 kaBP respectively in this region.The Ca/Mg ratio is an effective climate proxy,which has close relation with grain size.It is revealed that the leaching of loess was stronger in early HMP（Holocene Megathermal Period） rather than in later HMP.Central Henan has suffered environmental changes from cool-dry,cool-humid,cool-dry,warm-humid to warm-dry since the last deglaciation.

关 键 词：元素 环境变化 全新世 河南中部 邓家剖面 

分 类 号：P539.7[天文地球—古生物学与地层学]