Loess buried paleosols geosols welded paleosols pedocomplexes towards a global quaternary pedostratigraphy and paleoclimatic history  

作　　者：Arnt BRONGER 

机构地区：[1]Geographisches Institut der Universit a Kiel. D-24098 Kiel. Germany

出　　处：《Chinese Science Bulletin》1999年第S1期1-7,共7页

摘　　要：Micromorphological studies show that a comparision of the loess-paleosol sequence ofthe Karamaydan section, Central Asia, with the upper part of the Luochuan section, China, clearlyindicates that for the Brunhes chron the sequence at Karamaydan is even more detailed than thecorresponding section at Luochuan. Single paleosols at Luochuan correspond to pedocomplexes atKaramaydan; some pedocomplexes at Luochuan are represented by more detailed successions atKaramaydan (fig. 1). The loess-paleosol sequence at Karamaydan should therefore be regarded asa key sequence for reconstructing the climatic history of the Brunhes epoch. Correlation with thedeep-sea oxygen isotope record of Bassinot et al. (1994), which includes an accurate astronomicaltime scale, allows a detailed chronostratigraphical subdivision of the loess-paleosol sequence inKaramaydan for the Brunhes chron. Mineralogical and clay mineralogical investigations show thatthere is little difference in the type and amount of pedogenic clay mineral formation between twoHolocene soils and the paleosols in the Brunhes chron at Karamaydan. These results indicate thatthe climates of the interglacials represented by the B or Bt horizons of the buried paleosols weresimilar to that of the Holocene. In view of these results the Paleopedology Commission shoulddevelop a uniform terminology of mono- and polygenetic paleosols and pedostratigraphic unitswhich can be used globally.Micromorphological studies show that a comparision of the loess-paleosol sequence of the Karamaydan section, Central Asia, with the upper part of the Luochuan section, China, clearly indicates that for the Brunhes chron the sequence at Karamaydan is even more detailed than the corresponding section at Luochuan. Single paleosols at Luochuan correspond to pedocomplexes at Karamaydan; some pedocomplexes at Luochuan are represented by more detailed successions at Karamaydan (fig. 1). The loess-paleosol sequence at Karamaydan should therefore be regarded as a key sequence for reconstructing the climatic history of the Brunhes epoch. Correlation with the deep-sea oxygen isotope record of Bassinot et al. (1994), which includes an accurate astronomical time scale, allows a detailed chronostratigraphical subdivision of the loess-paleosol sequence in Karamaydan for the Brunhes chron. Mineralogical and clay mineralogical investigations show that there is little difference in the type and amount of pedogenic clay mineral formation between two Holocene soils and the paleosols in the Brunhes chron at Karamaydan. These results indicate that the climates of the interglacials represented by the B or Bt horizons of the buried paleosols were similar to that of the Holocene. In view of these results the Paleopedology Commission should develop a uniform terminology of mono- and polygenetic paleosols and pedostratigraphic units which can be used globally.

关 键 词：PALEOPEDOLOGY MICROMORPHOLOGY clay mineralogy pedostratigraphy QUATERNARY climatic HISTORY 

分 类 号：P534[天文地球—古生物学与地层学]