Chemical pretreatments for improving the radiocarbon dates of peats and organic silts in a gley podzol environment: Grahams Terrace, North Westland

Hammond, Andrew; Goh, K. M.; Tonkin, Philip J.; Manning, Martin

doi:10.1080/00288306.1991.9514456

Cited by 61 publications

(47 citation statements)

References 12 publications

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“…In general, the low-density material has higher 14C values and turns over more rapidly than much of the SOM. Charcoal may be isolated by dissolving other low-density material (except pollen) by treatment with strong acids and bases (Hammond et aL 1991;Gillespie et al 1992a;Gillespie et al 1992b …”

Section: Density Separationmentioning

confidence: 99%

Comparison of Fractionation Methods for Soil Organic Matter ¹⁴C Analysis

1996

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ABSTRACT. 14( measurements provide a useful test for determining the degree to which chemical and physical fractionation of soil organic matter (SOM) are successful in separating labile and refractory organic matter components. Results from AMS measurements of fractionated SOM made as part of several projects are summarized here, together with suggestions for standardization of fractionation procedures. Although no single fractionation method will unequivocally separate SOM into components cycling on annual, decadal and millennial time scales, a combination of physical (density separation or sieving) and chemical separation methods (combined acid and base hydrolysis) provides useful constraints for models of soil carbon dynamics in several soil types.

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Section: Density Separationmentioning

confidence: 99%

Comparison of Fractionation Methods for Soil Organic Matter ¹⁴C Analysis

1996

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“…Although traditionally the humic acid fraction was thought to yield younger 14 C ages than humin fraction in routine AAA chemical treatment, later literature has questioned this inference (e.g. Head et al 1989;Hamnond et al 1991;Orlova and Panychev 1993). Thus, the question still arises of which fraction age is more reliable in the case of an age difference in soil organic matter fractions.…”

Section: Validity Of 14 C Dating Buried Soilsmentioning

confidence: 94%

Radiocarbon Dating of Fugendake Volcano in Unzen, SW Japan

Hoshizumi²,

Uto³

et al. 2013

azu_js_rc

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ABSTRACT. This article presents new radiocarbon ages for the lavas, pyroclastic flow, and lahar deposits that originated from the Fugendake and Mayuyama volcanoes of the Younger Unzen Volcano, SW Japan. Nine charcoal samples were collected from the lavas and pyroclastic flow deposits, and 17 soil samples from the underlying volcanic-related products. This data set, together with previously published ages (thermoluminescence, K-Ar, fission track, and 14 C), yielded new information about the timing of Late Pleistocene eruptions and an improved understanding of the evolution of the Fugendake and Mayuyama volcanoes. Fugendake Volcano started to build within the scar of Myokendake around 29 cal ka BP, and its eruption products spread over the flank of Myokendake. The remarkable eruptions of Fugendake Volcano included the lava and pyroclastic flow deposits around 22, 17, 12, and 4.5 cal ka BP. Subsequent historical eruptions occurred in AD 1663, 1792, and 1991-1995. Developed on the eastern extension of Fugendake Volcano, Mayuyama Volcano was active during the building stage of Fugendake at 4.5 cal ka BP. This study also identified a pumice eruption at ~10 ka and 2 volcanic-related lahar deposits around 1.6 and 0.7 ka, which need to be addressed in future research.

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“…The problems in interpreting radiocarbon ages older than c. 35 ka, especially relating various pretreatment fractions, are well recognised and have been widely discussed (e.g., Bailey et al 1975;Goh & Pullar 1977;Goh et al 1978;Goh 1979;Grant-Taylor 1979;Suggate 1984;Wellman 1984;Evin 1990;Gillespie 1991;Hammond et al 1991). Whatever may be the precision of the radiocarbon measurement, if the pretreatment indicates that the analysed carbon is not original, then the actual age of the sample is indeterminate.…”

Section: Radiocarbon Agesmentioning

confidence: 99%

Letter to the Editor

Lowe

Hogg

1995

New Zealand Journal of Geology and Geophysics

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Chemical pretreatments for improving the radiocarbon dates of peats and organic silts in a gley podzol environment: Grahams Terrace, North Westland

Abstract: Radiocarbon dates obtained for peats and organic silts from the high rainfall/leaching environment of North Westland have been shown to conflict with known stratigraphic evidence by yielding anomalously young dates.

Cited by 61 publications

References 12 publications

Comparison of Fractionation Methods for Soil Organic Matter ¹⁴C Analysis

Comparison of Fractionation Methods for Soil Organic Matter ¹⁴C Analysis

Radiocarbon Dating of Fugendake Volcano in Unzen, SW Japan

Letter to the Editor

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Chemical pretreatments for improving the radiocarbon dates of peats and organic silts in a gley podzol environment: Grahams Terrace, North Westland

Abstract: Radiocarbon dates obtained for peats and organic silts from the high rainfall/leaching environment of North Westland have been shown to conflict with known stratigraphic evidence by yielding anomalously young dates.

Cited by 61 publications

References 12 publications

Comparison of Fractionation Methods for Soil Organic Matter 14C Analysis

Comparison of Fractionation Methods for Soil Organic Matter 14C Analysis

Radiocarbon Dating of Fugendake Volcano in Unzen, SW Japan

Letter to the Editor

Contact Info

Product

Resources

About

Comparison of Fractionation Methods for Soil Organic Matter ¹⁴C Analysis

Comparison of Fractionation Methods for Soil Organic Matter ¹⁴C Analysis