The incorporation of thermal methods in mineral magnetism of loess-paleosol sequences: a brief overview  

作　　者：A.J.VanVelzen M.J.Dekkers 

机构地区：[1]Paleomagnetic Laboratory Fort Hoofddijk, Faculty of Earth Sciences Budapestlaan 17, 3584 CD Utrecht, The Netherlands

出　　处：《Chinese Science Bulletin》1999年第S1期53-63,共11页

摘　　要：The advantages of thermal methods for mineral-magnetic research of loess/paleosolsequences are illustrated in an introductory overview. When applying thermal methods, magnetiteand maghemite can be distinguished, something which is difficult with field-dependentmeasurements at room temperature. Also, variable low-temperature oxidation that is related toclimate may be quantified. Thirdly, grain-size estimates pertaining to the whole superparamagneticrange can be inferred from LT warming experiments and to a lesser extent from variable chemicalalteration during heating. Application of mineral-magnetic techniques may lead to thedevelopment of quantifiable proxy parameters for paleoclimate.The advantages of thermal methods for mineral-magnetic research of loess/paleosol sequences are illustrated in an introductory overview. When applying thermal methods, magnetite and maghemite can be distinguished, something which is difficult with field-dependent measurements at room temperature. Also, variable low-temperature oxidation that is related to climate may be quantified. Thirdly, grain-size estimates pertaining to the whole superparamagnetic range can be inferred from LT warming experiments and to a lesser extent from variable chemical alteration during heating. Application of mineral-magnetic techniques may lead to the development of quantifiable proxy parameters for paleoclimate.

关 键 词：Magnetic MINERALS LOESS PALEOSOL pedogenic processes CURIE temperature 

分 类 号：P534[天文地球—古生物学与地层学]