黄土高原—毛乌素沙漠过渡带靖边地区全新世土壤元素地球化学特征及其环境意义  

Geochemical Characteristics of Soil Elements in Jingbian Area of Loess Plateau-Mu Us Desert Transitional Zone,China During Holocene and Their Environmental Implications

作　　者：王攀[1,2] 董秋瑶 巩雪娇[1,2,3] 陈洪云 宋超 郭娇[1,2] WANG Pan;DONG Qiu-yao;GONG Xue-jiao;CHEN Hong-yun;SONG Chao;GUO Jiao(Institute of Hydrogeology and Environmental Geology,Chinese Academy of Geological Sciences,Shijiazhuang 050061,Hebei,China;Key Laboratory of Quaternary Chronology and Hydro-environmental Evolution,China Geological Survey,Shijiazhuang 050061,Hebei,China;School of Resources,Hebei GEO University,Shijiazhuang 050031,Hebei,China)

机构地区：[1]中国地质科学院水文地质环境地质研究所,河北石家庄050061 [2]中国地质调查局第四纪年代学与水文环境演变重点实验室,河北石家庄050061 [3]河北地质大学资源学院,河北石家庄050031

出　　处：《地球科学与环境学报》2020年第5期678-687,共10页Journal of Earth Sciences and Environment

基　　金：中国地质科学院水文地质环境地质研究所基本科研业务费专项资金项目(SK201911,SK201310);中国地质调查局地质调查项目(12120113005900)。

摘　　要：靖边地区位于黄土高原—毛乌素沙漠过渡带,对气候变化的响应更加敏感。利用元素地球化学指标综合分析靖边地区三道沟土壤剖面的化学风化程度、全新世环境变化及其驱动机制。结果表明:三道沟土壤剖面的化学蚀变指数和Na2O/K2O值反映其处于初等化学风化作用阶段;三道沟土壤剖面形成于全新世8.4~1.8 ka,平均沉积速率为19.9 cm·ka^-1;化学蚀变指数重建的靖边地区全新世平均降水量为611 mm,平均温度为11.7℃;三道沟土壤剖面记录了靖边地区全新世经历了升温期(8.4~6.8 ka)、适宜期(6.8~4.2 ka)和降温期(4.2~1.8 ka)3个阶段的环境变化,其变化与全球气候变化相一致,主要受控于太阳辐射量变化。Jingbian area is located in Loess Plateau-Mu Us desert transitional zone,and is more sensitive to climate change.Element geochemical indicators from Sandaogou soil profile in Jingbian area were used to comprehensively analyze the chemical weathering intensity,Holocene environmental changes and driving mechanism.The results show that the chemical index of alteration and Na2O/K2O of Sandaogou soil profile reflect that it is in the primary weak chemical weathering stage;Sandaogou soil profile is formed during the Holocene 8.4-1.8 ka with an average deposition rate of 19.9 cm·ka^-1;the Holocene average precipitation and temperature in Jingbian area reconstructed by chemical index of alteration are 611 mm and 11.7℃;Sandaogou soil profile suffers three stages of environmental changes since the Holocene,which are warming(8.4-6.8 ka),suitable(6.8-4.2 ka)and cooling(4.2-1.8 ka);the changes are consistent with global climate,and are mainly controlled by insolation.

关 键 词：元素地球化学 全新世 土壤 风化程度 环境变化 驱动机制 黄土高原 毛乌素沙漠 

分 类 号：P532[天文地球—古生物学与地层学] P595[天文地球—地质学]