Thermoluminescence dating of ocean sediments

11-Jul-2017 15:27

Preliminary results for a number of aeolian sediments from Jutland are presented.In most cases the TL ages were in acceptable agreement with expected ages.The method uses a combination of results for quartz and feldspar, presuming that these two minerals have the same age.Samples are bleached by sunlight for different periods, and the correct bleaching time is taken as that producing residual values which yield identical ages for the minerals. Shelkoplyas, and for over a decade their TL dates, obtained from a variety of sediments, have appeared in the Soviet literature.We conclude that while TL dating has the potential to solve many sedimentary problems, more fundamental research needs to be carried out before such dates should be accepted.In two other cores closer to the Canada Glacier, IRSL ages from ~600 ± 200 yrs (top) to ~ 2900± 300 yrs (at depth) were measured.Luminescence dating is underutilized in American archaeology given the theoretical advantages of direct dating that it confers.

A method is proposed that may enable partially bleached sediments to be dated by determining the correct residual value to be used with the build-up curve.

A brief survey of these results obtained for various sediment types is included so as to demonstrate the range and promise of the TL method for dating Quaternary sediments.

Finally, future areas of research and as yet, unresolved problems are discussed.

Consequently, we tested the effectiveness of thermoluminescence (TL) zeroing in polymineral fine silt material from several depositional environments around and on the lake (stream suspensions, ice-surface sand dune, and silty sand from near the top of the more-than-3m-thick ice).

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We also conducted TL and infrared-stimulated-luminescence (IRSL) dating tests on material from three box cores recovered from the bottom of Lake Hoare, in a transect away from the abutting Canada Glacier.

A set of criteria for acceptable dates is proposed.