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《Journal of Glaciology and Geocryology》 2006-04
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Theory of Cosmogenic Nuclide Surface Exposure Dating and Its Applications in Geosciences

XU Liu-bing~1,2, ZHOU Shang-zhe~1(1.School of Geography,South China Normal University,Guangzhou Guangdong 510631,China;2.Departmentof Geology and Geophysics,University of Wisconsin-Madison,Madison Wisconsin WI-53703,U S A)  
Cosmogenic nuclide surface exposure dating is a newly developed isotopic dating technique in the past few years.Cosmogenic nuclides are primarily generated by reaction of target nuclei exposed near earth surface and galactic cosmic radiation.The reactions producing cosmogenic nuclides mainly involve spallation,capture of neutrons and muon reaction.The reacting cosmic particles producing nuclides primarily include secondary fast neutrons,thermal neutrons and slow negative muons.Due to the differential special distribution of these reacting particles,the production rates of cosmogenic nuclides at different latitude,altitude and depth are different.The concentration of cosmogenic nuclides is not only constrained by production rates and exposure time,and also closely related to surface erosion.Furthermore,the concentration is affected by geomagnetic intensity, shielding,chemical weathering,and sample geometry as well.These factors affecting cosmogenic nuclide concentration should be calibrated when surface exposure age is calculated.With the progress of the theory and methodology of cosmogenic surface exposure dating,the technique has been widely used in studies of Quaternary glaciations,impact craters,volcanic surfaces,and fault faces.
【Fund】: 国家自然科学基金项目(40371013)资助
【CateGory Index】: P597.3
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