Radiocarbon

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New ΔR Values for the Southwest Pacific Ocean
Radiocarbon - Tập 46 Số 2 - Trang 1005-1014 - 2004
Fiona Petchey, Matthew Phelan, J. Peter White
ΔR results of known-age shells from the Solomon and Coral Seas and the northwest coast of New Ireland are presented. The results are too few to be conclusive but indicate that ΔR in this region is variable. An average ΔR value of 370 ± 25 yr is recorded for a range of shell species from Kavieng Harbor, New Ireland, and is primarily attributed to weak equatorial upwelling of depleted 14C due to sea... hiện toàn bộ
A ΔR Correction Value for Samoa from Known-Age Marine Shells
Radiocarbon - Tập 41 Số 1 - Trang 99-101 - 1999
Matthew Phelan
A first-order ΔR correction value for marine samples is presented based on 3 radiocarbon determinations of known-age marine shells from Samoa.
Radiocarbon Chronology of the Holocene Dead Sea: Attempting a Regional Correlation
Radiocarbon - Tập 43 Số 3 - Trang 1179-1189 - 2001
Amos Frumkin, Galit Kadan, Yehouda Enzel, Y. Eyal
Holocene sedimentary and geomorphic sequences from the Dead Sea region, Israel, are compared by correlation of more than 50 radiocarbon dates. The 14C dates provided the chronological basis that enabled us to detect basin-scale events that are hard to ascertain in single-site records. This paper is the first attempt to compare different Holocene records from several sites along the Dead Sea, based... hiện toàn bộ
Marine04 Marine Radiocarbon Age Calibration, 0–26 Cal Kyr Bp
Radiocarbon - Tập 46 Số 3 - Trang 1059-1086 - 2004
Konrad A Hughen, M. G. L. Baillie, Édouard Bard, J Beck, Chanda Bertrand, Paul G. Blackwell, Caitlin E. Buck, George S. Burr, Kirsten Cutler, Paul E. Damon, R. Lawrence Edwards, Richard G. Fairbanks, Michael Friedrich, T. P. Guilderson, Bernd Kromer, Gerry McCormac, Sturt W. Manning, Christopher Bronk Ramsey, Paula Reimer, Ron Reimer, Sabine Remmele, John Southon, Minze Stuiver, Sahra Talamo, Frederick W. Taylor, J. van der Plicht, C. E. Weyhenmeyer
New radiocarbon calibration curves, IntCal04 and Marine04, have been constructed and internationally ratified to replace the terrestrial and marine components of IntCal98. The new calibration data sets extend an additional 2000 yr, from 0–26 cal kyr BP (Before Present, 0 cal BP = AD 1950), and provide much higher resolution, greater precision, and more detailed structure than IntCal98. For the Mar... hiện toàn bộ
Radiocarbon Dating Evidence for Mammoths on Wrangel Island, Arctic Ocean, Until 2000 BC
Radiocarbon - Tập 37 Số 1 - Trang 1-6 - 1995
Sergey Vartanyan, Х. А. Арсланов, T. V. Tertychnaya, С. В. Чернов
Radiocarbon dating results of mammoth tusks, teeth and bones collected on Wrangel Island between 1989 and 1991 reveal a unique mammoth refugium during the Holocene. We used an improved chemical procedure to obtain and purify collagen from bone. Benzene synthesized from the samples was measured using a liquid scintillation counter. The validity of our data has been confirmed by the results of our m... hiện toàn bộ
Recent and Planned Developments of the Program OxCal
Radiocarbon - Tập 55 Số 2 - Trang 720-730 - 2013
Christopher Bronk Ramsey, Sharen Lee
OxCal is a widely used software package for the calibration of radiocarbon dates and the statistical analysis of 14C and other chronological information. The program aims to make statistical methods easily available to researchers and students working in a range of different disciplines. This paper will look at the recent and planned developments of the package. The recent additions to the statist... hiện toàn bộ
Radiocarbon Levels in the Iceland Sea from 25–53 kyr and their Link to the Earth's Magnetic Field Intensity
Radiocarbon - Tập 42 Số 3 - Trang 437-452 - 2000
Antje H L Voelker, Pieter Meiert Grootes, Marie‐Josée Nadeau, Michael Sarnthein
By correlating the climate records and radiocarbon ages of the planktonic foraminifera N. pachyderma(s) of deep-sea core PS2644 from the Iceland Sea with the annual-layer chronology of the GISP2 ice core, we obtained 80 marine 14C calibration points for the interval 11.4-53.3 ka cal BP. Between 27 and 54 ka cal BP the continuous record of 14C/cal age differences reveals three intervals of highly i... hiện toàn bộ
An Overview of 14C Analysis in the Study of Groundwater
Radiocarbon - Tập 42 Số 1 - Trang 99-114 - 2000
Mebus A. Geyh
This paper provides a summary overview of the current state-of-art in the radiocarbon dating of groundwater. While the use of natural 14C measurements in applied hydrogeology still presents a difficult challenge, meaningful dates can be achieved if they are determined and interpreted in conjunction with the analyses of other isotopic species that occur in the natural environment. Although 14C dati... hiện toàn bộ
University of Tokyo Radiocarbon Measurements IV
Radiocarbon - Tập 13 Số 1 - Trang 97-102 - 1971
Hiromi Kobayashi, Yasuko Matsui, Hisashi Suzuki
The C14 measurements reported here were made in this laboratory between January 1969 and July 1970. Details of our apparatus, sample preparation, and measuring procedure were described in R., 1968, v. 10, p. 144–148. A change has been made since January 1969: strontium carbonate is reduced to strontium carbide with a mixture of 60g of SrCO3 to 40g of Mg-powder (<200 mesh) instead of 60g of SrCO3 t... hiện toàn bộ
Problems in Radiocarbon Dating of Soils
Radiocarbon - Tập 35 Số 3 - Trang 351-362 - 1993
О.А. Чичагова, Alexander Cherkinsky
We discuss our progress in three principal applications of 14C dating of recent and fossil soils: 1) new methods; 2) problems of interpreting 14C soil data (e.g.,14C age of soils, age of soils, duration of humus formation, rate of carbon cycling); and 3) 14C analysis of soil organic matter (OM) in pedology and paleogeography (e.g., soil genesis and evolution, humus formation and OM metamorphosis, ... hiện toàn bộ
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