scholarly journals Radiocarbon Dating of δ18O-δD Plots in Late Pleistocene Ice-Wedges of the Duvanny Yar (Lower Kolyma River, Northern Yakutia)

Radiocarbon ◽  
2001 ◽  
Vol 43 (2B) ◽  
pp. 541-553 ◽  
Author(s):  
Yurij K Vasil'chuk ◽  
Alla C Vasil'chuk ◽  
Dieter Rank ◽  
Walter Kutschera ◽  
Jong-Chan Kim
Keyword(s):  
Mass Spectrometry ◽  
Cross Section ◽  
Accelerator Mass Spectrometry ◽  
Organic Material ◽  
Radiocarbon Dating ◽  
Sandy Loam ◽  
New Approach ◽  
Permafrost Sediment ◽  
Ams Dating ◽  
Kolyma River

The Duvanny Yar cross-section located in the Lower Kolyma River valley of Northern Yakutia (69°N, 158°E, height above the Kolyma River level 55 m), has been studied and dated in detail by radiocarbon. The sequence mainly consists of sandy loam sediments with large syngenetic ice wedges. Their width at the top is 1–3.5 m. Allochthonous organic material occurs in high content, concentrating as 0.5–0.7 m lenses. Shrub fragments, twigs, and mammoth bones are accumulated in peaty layers. Through interpolation based on a series of 14C dates, dating of the host sediments provides an approximate age for the ice wedges. The 14C dates of various types of organic material are sometimes very close, but not all in agreement. Therefore, the dates do not accurately show the age of the δ18O and δD plots. A new approach is developed to a 14C dating strategy of syncryogenic sediments with high admixture of allochthonous organic material. The main purpose of this study is to consider detection of inversions or disturbances in the syngenetic permafrost sediment at the Duvanny Yar cross-section by 14C date series. Direct accelerator mass spectrometry (AMS) dating of the ice confirmed the relatively young age of ice wedges.

scholarly journals Problems in the Extension of the Radiocarbon Calibration Curve (10–13 kyr BP)

Radiocarbon ◽  
1995 ◽  
Vol 37 (1) ◽  
pp. 75-79 ◽  
Author(s):  
Irena Hajdas ◽  
Susan D. Ivy-Ochs ◽  
Georges Bonani
Keyword(s):  
Mass Spectrometry ◽  
Time Scales ◽  
Calibration Curve ◽  
Accelerator Mass Spectrometry ◽  
Radiocarbon Dating ◽  
Late Glacial ◽  
Varved Lake Sediments ◽  
Ams Dating ◽  
Varve Counting ◽  
Radiocarbon Calibration

Radiocarbon dating of varved lake sediments shows that, during the Late Glacial (10–12 kyr bp), the offset between the 14C and the absolute time scales was ca. 1 kyr. Varve counting and accelerator mass spectrometry (AMS) dating were used to build absolute and 14C time scales of sediments from two lakes—Soppensee, Switzerland and Holzmaar, Germany. The resulting chronologies extend back to ca. 12.9 kyr cal bp (12.1 kyr bp) in the case of Soppensee and to ca. 13.8 kyr cal BP (12.6 kyr bp) in the Holzmaar record. They compare well with each other but differ significantly from the 14C-U/Th chronology of corals (Bard et al. 1993; Edwards et al. 1993).

scholarly journals The Radiocarbon Dating and Authentication of Iron Artifacts

Radiocarbon ◽  
2002 ◽  
Vol 44 (3) ◽  
pp. 717-732 ◽  
Author(s):  
P T Craddock ◽  
M L Wayman ◽  
A J T Jull
Keyword(s):  
Mass Spectrometry ◽  
Accelerator Mass Spectrometry ◽  
Radiocarbon Dating ◽  
Fossil Fuel ◽  
Last Millennium ◽  
Chemical Combination ◽  
Ams Dating ◽  
Iron Artifacts ◽  
Different Origins ◽  
Ams Dates

The continuing improvements in accelerator mass spectrometry (AMS) dating technology mean that it is possible to work on ever smaller samples, which in turn, make an ever wider range of sample potentially available for dating. This paper discusses some of the difficulties arising with the interpretation of AMS dates obtained from carbon in iron. The overriding problem is that the carbon, now in chemical combination with the iron, could have come from a variety of sources with very different origins. These are now potentially an iressolvable mixture in the iron. For iron made over the last millennium, there are the additional problems associated with the use of both fossil fuel and biomass fuel in different stages of the iron making, leading to great confusion, especially with authenticity studies.

14C Dating of Soil Organic Carbon (SOC) in Loess-Paleosol Using Sequential Pyrolysis and Accelerator Mass Spectrometry (AMS)

Radiocarbon ◽  
2013 ◽  
Vol 55 (2) ◽  
pp. 563-570 ◽  
Author(s):  
Peng Cheng ◽  
Weijian Zhou ◽  
Hong Wang ◽  
Xuefeng Lu ◽  
Hua Du
Keyword(s):  
Mass Spectrometry ◽  
Organic Carbon ◽  
Soil Organic Carbon ◽  
Accelerator Mass Spectrometry ◽  
Radiocarbon Dating ◽  
Pyrolysis Temperature ◽  
Chemical Extraction ◽  
14C Dating ◽  
New Approach ◽  
Soc Fractions

The chemical extraction of soil organic carbon (SOC) fractions from soils often does not produce satisfactory results for radiocarbon dating. In this study, a sequential pyrolysis technique was investigated. The soil was pyrolyzed at temperatures of 200, 400, 600, and 800 °C to partition organic carbon into pyrolytic volatile (Py-V) and pyrolytic residue (Py-R) fractions. The preliminary results show that the 14C dates of both fractions become progressively older as the pyrolysis temperature is increased. In addition, the ages of the Py-V fractions are consistently younger than the corresponding Py-R fractions extracted at the same temperature. Experimental results of known-age paleosol samples indicate that the Py-V fractions obtained between 600 and 800 °C yield the most reliable ages. This technique provides a new approach to improve the accuracy of 14C dating of loess-paleosol sequences.

RADIOCARBON DATING APPLIED TO PREHISPANIC TERRITORIAL DYNAMICS AT EL MAYE, IXMIQUILPAN, HIDALGO, MEXICO

Radiocarbon ◽  
2020 ◽  
Vol 62 (6) ◽  
pp. 1723-1731
Author(s):  
Alberto Alcántara ◽  
Corina Solís ◽  
Fernando López Aguilar ◽  
María Rodríguez-Ceja ◽  
Víctor Hugo Anaya Linares ◽  
...  
Keyword(s):  
Mass Spectrometry ◽  
Local Government ◽  
Accelerator Mass Spectrometry ◽  
Radiocarbon Dating ◽  
Collaborative Study ◽  
Archaeological Site ◽  
Postclassic Period ◽  
Residential Units ◽  
Late Postclassic ◽  
Ams Dating

ABSTRACTEl Maye is a community located in the municipality of Ixmiquilpan, Hidalgo, in the central region of Mexico. During the late Postclassic period (1350–1521 AD), the Aztecs controlled the area through the establishment of a dual-headed system, one part belonging to the Aztec government and the other to the local government. El Maye was the local government center for the Ixmiquilpan territory under the Aztec domain. The residential units of El Maye archaeological site were constructed in 6 different occupational phases, with the presence of large rooms, stucco floors and walls, offerings, and a variety of ceramics belonging to the late Aztec III ceramic period (1400–1520 AD). The Axis Project of the Mezquital Valley (PEVM-ENAH) and the Accelerator Mass Spectrometry Laboratory (LEMA-UNAM) have undertaken a collaborative study of the El Maye site by performing absolute radiocarbon accelerator mass spectrometry (14C AMS) dating. For a better understanding of the emergence and development of El Maye, a series of AMS 14C dates of charcoal and bone samples recovered from different stratigraphic levels, was performed. This allowed us to locate the occupation of the site between 1320 and 1625 cal AD.

Determination of the stellar (n,γ) cross section ofCa40with accelerator mass spectrometry

2009 ◽  
Vol 79 (6) ◽  
Author(s):  
I. Dillmann ◽  
C. Domingo-Pardo ◽  
M. Heil ◽  
F. Käppeler ◽  
A. Wallner ◽  
...  
Keyword(s):  
Mass Spectrometry ◽  
Cross Section ◽  
Accelerator Mass Spectrometry

Measurement of the 26Mg(p, n)26 Alg (7.2 × 105) yr cross section via accelerator mass spectrometry

1980 ◽  
Vol 94 (3) ◽  
pp. 303-306 ◽  
Author(s):  
M. Paul ◽  
W. Henning ◽  
W. Kutschera ◽  
E.J. Stephenson ◽  
J.L. Yntema
Keyword(s):  
Mass Spectrometry ◽  
Cross Section ◽  
Accelerator Mass Spectrometry

scholarly journals 14C Wiggle-Matching of the B-Tm Tephra, Baitoushan Volcano, China/North Korea

Radiocarbon ◽  
2010 ◽  
Vol 52 (3) ◽  
pp. 933-940 ◽  
Author(s):  
Shinya Yatsuzuka ◽  
Mitsuru Okuno ◽  
Toshio Nakamura ◽  
Katsuhiko Kimura ◽  
Yohei Setoma ◽  
...  
Keyword(s):  
Mass Spectrometry ◽  
Accelerator Mass Spectrometry ◽  
North Korea ◽  
Radiocarbon Dating ◽  
Gas Emission ◽  
Volcanic Gas ◽  
Ams Radiocarbon Dating ◽  
Eruption Age ◽  
The Difference ◽  
Volcanic Gas Emission

We performed accelerator mass spectrometry (AMS) radiocarbon dating and wiggle-matching of 2 wood samples from charred trunks of trees (samples A and B) collected from an ignimbrite deposit on the northeastern slope of the Baitoushan Volcano on the border of China and North Korea. The obtained calendar years for the eruption are cal AD 945–960 for sample A and cal AD 859–884 and cal AD 935–963 for sample B in the 2-σ range. These results are unable to determine the precise eruption age. The reason for the difference in reported ages may be due to volcanic gas emission prior to the huge eruption.

scholarly journals Reliability of Bone Gelatin AMS Dating: Rattus Exulans and Marine Shell Radiocarbon Dates from Pauatahanui Midden Sites in Wellington, New Zealand

Radiocarbon ◽  
1999 ◽  
Vol 41 (2) ◽  
pp. 119-126 ◽  
Author(s):  
Nancy Beavan Athfield ◽  
Bruce McFadgen ◽  
Rodger Sparks
Keyword(s):  
Mass Spectrometry ◽  
New Zealand ◽  
Beta Decay ◽  
Confidence Level ◽  
Accelerator Mass Spectrometry ◽  
Radiocarbon Dates ◽  
Austrovenus Stutchburyi ◽  
Ams Dating ◽  
Marine Shell

A suite of 6 bone gelatin accelerator mass spectrometry (AMS) radiocarbon dates for Rattus exulans Peale and associated beta decay 14C dates for Austrovenus stutchburyi shell are presented for 4 middens at Pauatahanui, Wellington, New Zealand. Mean calibrated age ranges of Rattus exulans (520–435 BP and 350–330 BP at 95% confidence level) and shell (465–375 BP at 95% confidence level) from the 4 midden sites overlap. The agreement between Rattus exulans bone gelatin dates and associated shell provides an inter-sample comparison of 14C dating using both gas counting (beta decay) and AMS dating techniques. We examine the adequacy of the standard gelatinization treatment for bone samples, which has been employed consistently at the laboratory since 1995.

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