Thermoluminescence dating of ocean sediments jack coleman and hayden panettiere dating


30-Jan-2018 13:42

thermoluminescence dating of ocean sediments-63

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We observed effective zeroing of light-sensitive TL in suspended silt from one input stream and less effective zeroing from another stream.We observed effective zeroing of light-sensitive TL also in silt from a glacier-proximal eolian ice-surface dune and from sand from within the upper 5 cm of ice.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.If this is correct, the stratigraphic variations of the CL intensity in the Doushantuo Formation at Jiulongwan support the pulsed oxidation of the DOC reservoir in the Ediacaran Ocean.

We thus propose that the X-OM and its CL detected in our study may have recorded the evolution of the possible DOC reservoir in the Ediacaran Doushantuo Ocean.

In contrast, in box-core 1, the bottom sediment yielded minimum TL apparent ages of 1500-2600 yrs, with no discernable stratigraphic depth trend.

IRSL dating applied to the same box-core samples produced significantly lower age estimates, ranging from ~600 ± 200 yrs to 1440 ± 270 yrs top-to-bottom, an improvement over the depth-constant ~2200 yrs TL ages.

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.

These excursions have been interpreted as a result of widespread remineralization of a large dissolved organic carbon (DOC) reservoir in the Ediacaran deep oceans.