石英
发光
矿物学
饱和(图论)
热释光年代测定
地质学
航程(航空)
沉积岩
地球化学
材料科学
古生物学
复合材料
数学
光电子学
组合数学
作者
Hiroyuki Yoshida,Richard G. Roberts,Jon Olley,G. M. Laslett,R. F. Galbraith
标识
DOI:10.1016/s1350-4487(99)00287-5
摘要
Luminescence dating methods have been used to obtain reliable age estimates for quartz sediments deposited within the last 500 ka, but it has proven difficult to extend the age range much beyond this limit. Here we report the results of a study of individual quartz grains from Australian sedimentary deposits that range in age from ∼250 to ∼950 ka. A small number of the grains examined are strongly luminescent and saturate at unusually high doses. These ‘supergrains’ may permit reliable age determination to 1 Ma, and possibly beyond. Some other grains are in, or close to, dose-saturation, so that only minimum age estimates may be obtained. Most of the grains examined are very weakly luminescent and have palaeodoses much less than expected, while the palaeodoses of some grains cannot be estimated because of anomalous dose–response characteristics. We offer some possible explanations for the behaviour of aberrant grains.
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