Show simple item record Li, Bo Li, Sheng-Hua Wintle, Ann Zhao, Hui 2011-02-14T12:39:54Z 2011-02-14T12:39:54Z 2008-06-26
dc.identifier.citation Li , B , Li , S-H , Wintle , A & Zhao , H 2008 , ' Isochron dating of sediments using luminescence of K-feldspar grains ' Journal of Geophysical Research: Earth Surface , vol 113 , no. F2 , F02026 . , 10.1029/2007JF000900 en
dc.identifier.issn 2169-9003
dc.identifier.other PURE: 157415
dc.identifier.other PURE UUID: 903cae6b-3c31-4aa8-81b5-381d537c425e
dc.identifier.other dspace: 2160/6113
dc.description Sponsorship: Research Grant Council of the Hong Kong Special Administrative Region, China (project 7106/02P, 7032/05, and 7035/06). en
dc.description.abstract A new method for dating well-bleached sediments is presented, with results for thirteen samples from China. The method uses an isochron constructed from the measurement of natural radiation doses received by potassium-feldspar grains in a range of grain sizes using the infrared stimulated luminescence (IRSL) signal. The age of deposition of the sediment is calculated from this isochron and from the internal dose rate to the grains from 40K and 87Rb in the crystal lattice. This procedure appears to overcome age underestimation due to anomalous fading, a phenomenon that has precluded conventional luminescence dating of K-feldspars and would be applicable to K-feldspars for which the natural dose is beyond the linear dose response region. Also, since the isochron IRSL method is reliant on only the internal dose rate, it overcomes problems related to (1) changes in past dose rate due to postdepositional migration of radionuclides, (2) changes in water content as water-lain sediments dry out, (3) spatial heterogeneity in the gamma dose rate, and (4) uncertainties in the cosmic ray dose rate during the period of sample burial. en
dc.language.iso eng
dc.relation.ispartof Journal of Geophysical Research: Earth Surface en
dc.subject luminescence dating en
dc.subject K-feldspars en
dc.subject anomalous fading en
dc.subject isochron en
dc.subject IIRSL en
dc.title Isochron dating of sediments using luminescence of K-feldspar grains en
dc.type /dk/atira/pure/researchoutput/researchoutputtypes/contributiontojournal/article en
dc.contributor.institution Centre for Glaciology en
dc.contributor.institution Institute of Geography & Earth Sciences en
dc.description.status Peer reviewed en

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