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同位素地层和土壤地层及其在第四纪研究中的应用 预览 被引量:2
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作者 韩家杼 《第四纪研究》 CAS CSCD 北大核心 2000年第2期 203-205,共3页
同位素地层和土壤地层是在多 地层划分理论的基础上,为适应第四纪高分辨率古环境研究的需要建立起来的两种地层划分的方法。这两种地层划分方法在第四纪古环境的研究中显示了很强的生命力。
关键词 同位素地层 地层 第四纪 地层划分
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Loess buried paleosols geosols welded paleosols pedocomplexes towards a global quaternary pedostratigraphy and paleoclimatic history 被引量:1
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作者 Arnt BRONGER 《中国科学通报:英文版》 SCIE CAS 1999年第S1期1-7,共7页
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 chr... 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. 展开更多
关键词 Paleopedology MICROMORPHOLOGY clay MINERALOGY pedostratigraphy QUATERNARY climatic HISTORY
Magneto-and pedo-stratigraphy of paleosol-loess sequences in the Lanzhou Basin:Evidence for evolution of Huang He
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《中国科学通报:英文版》 SCIE CAS 1999年第S1期119-128,共10页
Results of magnetopedostratigraphic study of three sections of loess in the LanzhouBasin are significant. (1) The oldest aeolian loess deposited on pediment in the Lanzhou Basindates back to 1.8 Ma, indicating the e... Results of magnetopedostratigraphic study of three sections of loess in the LanzhouBasin are significant. (1) The oldest aeolian loess deposited on pediment in the Lanzhou Basindates back to 1.8 Ma, indicating the end of erosion development. (2) The highest (also oldest)terrace T7 is identified and dated at about 1.7 Ma. Huang He began developing (about 1.8-1.7 Ma)after dissection of the pediment and before the oldest terrace formed. The incision rate of HuangHe varied with time. Its two peak periods are from 1.8 to 1.7 Ma BP and from 0.15 Ma BP topresent, corresponding to episodic uplift of the Tibetan Plateau. 展开更多
关键词 Lanzhou Basin HUANG HE TERRACE LOESS magneto-pedostratigraphy
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