Received date: 1994-11-03
Revised date: 1995-03-20
Online published: 1995-12-01
In the middle of 1980’s, an effective procedure for 10Be measurement in loess by AMS has been established. Some important geochemistry behaviors such as good preservation of 10Be in loess strata have been observed, showing obviously that the investigation on 10Be in loess would be very significant. A total of more than 600 samples from the upper 0.4~138m of the Luochuan section was analysed for 10Be concentrations and an isotopie curve of continental deposition since 2.5Ma has been established. Relative increase of 20~25% of 10Be concentration within 20~30ka duration are observed in the vicinity of the geomagnetic reversals. The linearity of relationship between accumulation rate and 10Be flux of loess is also astonishingly good. It reveals a new way for the dating of loess strata. Both the event of Raisbeck peak at 35000 a BP and 10Be/26Al ratio have been studied, which are expected to be new dating methods for loess strata. Based on 10Be-susecptibility model with a new concept of magnetic material flux, pedogenic ferromagnetic material flux in Chinese loess have been estimated quantitatively and average paleorainfall values in Luochuan region have been calculated. The concentrations of in situ cosmogenic 10Be in quartz from loess have been measured accurately and the erosion rates of the source regions have also been calculated.
Key words： Loess; 10Be syudy.
Shen Chengde, Yi Weixi, Liu Dongsheng . ADVANCE IN 10Be STUDY IN CHINESE LOESS[J]. Advances in Earth Science, 1995 , 10(6) : 590 -596 . DOI: 10.11867/j.issn.1001-8166.1995.06.0590
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