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Dating of dipterocarp tree rings: establishing a record of carbon cycling and climatic change in the tropics

Author: Robertson, I ; Froyd, CA ; Walsh, RPD ; Newbery, DM ; Woodborne, S ; Ong, RC Date: Oct 2004 In a first step to obtain a proxy record of past climatic events (including the El Ni (n) over tildeo-Southern Oscillation) in the normally a seasonal tropical environment of Sabah, a radial segment from a recently fallen dipterocarp (Shorea ... Read more
Late holocene marine radiocarbon reservoir correction for the Southern and Eastern Coasts of South Africa

Author: Maboya, ML ; Meadows, ME ; Reimer, PJ ; Backeberg, Bjorn-Christoph ; Haberzettl, T Date: Dec 2017 The marine reservoir effect is the difference in radiocarbon (14C) between the atmosphere and the marine surface ocean. To overcome the dating errors induced, it is necessary to correct marine 14C ages for this effect. R is the difference ... Read more
Late quaternary hillslope evolution recorded in eastern South African colluvial badlands

Author: Clarke, ML ; Vogel, JC ; Botha, GA ; Wintle, AG Date: 01 Sep 2003 Infrared stimulated luminescence (IRSL) ages have been obtained from a sequence of sandy colluvial deposits in northern Kwazulu-Natal. Comparison of the IRSL ages on sand-sized, potassium-rich feldspars, with radiocarbon dates on A-horizon ... Read more
Life-span of leadwood trees

Author: Vogel, JC ; Fuls, A Date: Jan 2005 Radiocarbon analyses on 16 specimens of the Leadwood tree, Combretum imberbe, showed that they live for several hundred years. The oldest specimen was more than 1000 years old when it died and had an extremely slow radial growth rate of 0.33 ... Read more
Radiocarbon adjustments to the dendrochronology of a yellowwood tree

Author: Vogel, JC ; Fuls, A ; Visser, E Date: Mar 2001 High-precision radiocarbon dating of a millennium-old yellowwood tree from the Midlands of Natal shows that the tree-rings do, in general, record annual growth, but that both missing and false rings occur. At two places along the transect of ... Read more
Radiocarbon-dates of snow petrel regurgitations can reveal exposure periods for nunataks in Antarctica

Author: Ryan, PG ; Steele, WK ; Siegfried, WR ; Vogel, JC Date: Nov 1992 There are several problems associated with determining radiocarbon dates, particularly for organic material from Antarctica. However, this study attempts to find accurate measure of the length of time these radiocarbon dates have been established ... Read more
Secular variations in carbon-14 and their geophysical implications

Author: Vogel, JC Date: Mar 2002 Cosmic ray production of the radioactive carbon isotope C-14, which is the basis for the radiocarbon dating method, has not remained constant over time. The result is that radiocarbon dates show significant deviations from the true age. The ... Read more
Suitability of Ostrich eggshell for radiocarbon dating

Author: Vogel, JC ; Visser, E ; Fuls, A Date: 2001 Ostrich eggshell from archaeological sites remains largely free of more recent carbon contamination and as such is suitable material for radiocarbon dating. The carbonate fraction of the shell does, however, display an initial deficit in C14, ... Read more

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Browsing by Subject "Radiocarbon dating"

Browsing by Subject "Radiocarbon dating"

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