Browsing by Author "Yapp C.J."
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Browsing by Author "Yapp C.J."
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Yapp C.J. (2003)“Plateau” δ18O values of CO2 that evolved from the Fe(CO3)OH component during isothermal vacuum dehydrations (200–230 °C) of 18 natural goethites range from 8.2 to 28.1‰. In contrast, the measured δ18O values of the goethite ...
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Yapp C.J.; Poths H. (1996)Abundance and carbon isotope data from an Fe(CO3)OH component in apparent solid solution in oolitic goethites have been used to infer ancient atmospheric CO2 pressures. A test of the validity of these estimates might be ...
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Yapp C.J. (2000)Paired D/H and 18O/16O analyses of natural goethites range from -224%% to -93%% for δD and from -15.5%% to +2.8%% for δ18O. The isotopic systematics of these goethites seem to be most closely mimicked by the goethite-water ...
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Tabor N.J.; Yapp C.J. (2005)A Late Paleocene (~60 Ma BP) lateritic soil from Northern Ireland (the Antrim paleosol, herein referred to as Nire) contains coexisting goethite, gibbsite, phyllosilicate, and hematite. The Fe(III) oxides exhibit pisolitic ...
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Balakrishnan M.; Yapp C.J. (2004)A simple flux balance model with a diffusive, evaporative boundary layer indicates that the time constant (characteristic time) for approach to oxygen isotope steady state in the body fluid of land snails is ~19 min or ...
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Tabor N.J.; Yapp C.J.; Montanez I.P. (2004)Pedogenic goethites in each of two Early Permian paleosols appear to record mixing of two isotopically distinct CO2 components—atmospheric CO2 and CO2 from in situ oxidation of organic matter. The δ13C values measured for ...
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Yapp C.J. (2001)Measured values of mol fraction (X) and δ13C in the Fe(CO3)OH component of 49 samples of goethite (α-FeOOH) from a wide variety of environments range from 0.0015 to 0.0182 and from -21.7 to +3.3%%, respectively. The ...
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Yapp C.J.; Poths H. (1995)Hydrogen isotope exchange experiments between goethite and water vapor were performed at 22°C after vacuum ''outgassing'' at temperatures ranging from 100 to 140°C. The results for five natural and one synthetic goethite ...
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Yapp C.J. (1996)Concentrations of the Fe(CO3)OH component in goethites from Phanerozoic oolitic ironstones appear to record information on the partial pressures of soil CO2 in ancient subaerial weathering environments. Application of a ...
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