Isochron dating of sediments using luminescence of K-feldspar grains

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dc.contributor.author Wintle, Ann G.
dc.contributor.author Li, Sheng-Hua
dc.contributor.author Zhao, Hui
dc.contributor.author Li, Bo
dc.date.accessioned 2011-02-14T12:39:54Z
dc.date.available 2011-02-14T12:39:54Z
dc.date.issued 2008-06-26
dc.identifier.citation Wintle , A G , Li , S-H , Zhao , H & Li , B 2008 , ' Isochron dating of sediments using luminescence of K-feldspar grains ' Journal of Geophysical Research: Earth Surface . en
dc.identifier.other PURE: 157415
dc.identifier.other dspace: 2160/6113
dc.identifier.uri http://hdl.handle.net/2160/6113
dc.description Li, B., Li, S-H., Wintle, A. G., Zhao, H. (2008). Isochron dating of sediments using luminescence of K-feldspar grains. Journal of Geophysical Research - Earth Surface, 113: F02026. 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.title Isochron dating of sediments using luminescence of K-feldspar grains en
dc.type Text en
dc.type.publicationtype Article (Journal) en
dc.identifier.doi http://dx.doi.org/10.1029/2007JF000900
dc.contributor.institution Institute of Mathematics & Physics (ADT) en
dc.contributor.institution Centre for Glaciology en
dc.description.status Peer reviewed en


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