Paleoenvironment and the oxygen isotope geochemistry of ironstone of the Upper Ordovician Neda Formation, Wisconsin, USA
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Cited by (32)
Disparate relationships between pH and goethite-water <sup>18</sup>O/<sup>16</sup>O and D/H fractionation factors
2022, Geochimica et Cosmochimica ActaCitation Excerpt :Moreover, a published result for goethite synthesized by oxidation of siderite at 46 °C and a pH of 5.9 (Yapp, 2007) suggests that the equation relating values of 1000ln18α(LpH) to 106/T2 at pH ≤ ∼2 (Yapp, 1987, 1990, 2007) might apply up to a pH of ∼6 over a range of sedimentary and early diagenetic temperatures. The low-pH equation has been used with apparent success in studies of natural goethites from a variety of freshwater environments (e.g., Yapp, 1987, 1993a, 1993b, 1997, 1998, 2000, 2001, 2008, 2020; Bird et al, 1992, 1993; Girard et al., 1997, 2000, 2002; Pack et al., 2000; Poage et al., 2000; Sjostrom et al., 2004; Tabor et al., 2004; Tabor and Yapp, 2005; Hren et al., 2006; Yapp and Shuster, 2011, 2017; Gulbranson et al., 2015; Miller et al., 2017). Unless it was accidental, the success of those applications suggests that the experimentally determined values of 18α(LpH) mimicked the mineral–water fractionation factors associated with crystallization of the natural goethites.
Recovery and interpretation of the <sup>18</sup>O/<sup>16</sup>O of Miocene oolitic goethites in multi-generational mixtures of Fe (III) oxides from a channel iron deposit of Western Australia
2020, Geochimica et Cosmochimica ActaCitation Excerpt :Analysis of physically separated minerals circumvents this problem, but, in general, the methods of physical separation are not effective with fine-grained mixtures of Fe (III) oxides. Selective dissolution and atom balance calculations have been used in combination with fluorination to determine δ18O values of some constituents in mixtures of silicates, oxides, and/or carbonates (e.g., Yapp, 1991, 1993a, 1998; Bird et al., 1992, 1993; Bao et al., 2000; Tabor et al., 2004; Tabor and Yapp, 2005; Gulbranson et al., 2015). However, selective dissolution is generally an ineffective means of determining the respective δ18O values of FeOOH and Fe2O3 in fine-grained mixtures of goethite and hematite.
Intracrystalline site preference of oxygen isotopes in goethite: A single-mineral paleothermometer
2020, Earth and Planetary Science LettersCitation Excerpt :The first assumption is known to be incorrect in some geological environments, where significant deviations from the GMWL can arise (Gat, 2000). The third statement has been the focus of a significant body of previous research (Yapp, 1987, 1990; Müller, 1995; Zheng 1998; Bao and Koch, 1999), including how cation substitution for Fe+3 in goethite (Yapp, 1993a,b; Feng and Yapp, 2008; Yapp, 2012) and the pH of the fluid from which goethites crystallize (Yapp, 1993a,b; Feng and Yapp, 2008; Yapp, 2012) can affect goethite-water fractionation factors. Through corrections for the presence of substituent Al and advances in our understanding of the role of pH on goethite-water isotopic fractionations (Yapp, 2007), the determination of paleotemperatures from the paired hydrogen-oxygen isotope method has improved over the last few decades.
<sup>18</sup>O/<sup>16</sup>O in CO<inf>2</inf> evolved from goethite during some unusually rapid solid state α-FeOOH to α-Fe<inf>2</inf>O<inf>3</inf> phase transitions: Test of an exchange model for possible use in oxygen isotope analyses of goethite
2015, Geochimica et Cosmochimica ActaCitation Excerpt :The mineral goethite (α-FeOOH) is a common product of chemical weathering in wet, oxidizing environments (e.g., Garrels and Christ, 1965; Schwertmann, 1988). Because of this environmental selectivity, the stable isotope composition of structural oxygen in goethite can be an important source of information on surface and near-surface paleotemperatures as well as the isotopic characteristics of ancient meteoric waters (Yapp, 1987a, 1991, 1993a,b, 1997, 1998, 2000, 2008; Bird et al., 1992, 1993; Hein et al., 1994; Girard et al., 1997, 2000, 2002; Bao et al., 2000; Pack et al., 2000; Poage et al., 2000; Sjostrom et al., 2004; Tabor et al., 2004a; Fifarek and Rye, 2005; Seidel et al., 2005; Tabor and Yapp, 2005a; Hren et al., 2006; Grosz et al., 2006; Dideriksen et al., 2010; Yapp and Shuster, 2011; Gulbranson et al., 2015). One or more fine-grained oxygen-bearing substances such as silica, aluminosilicates, Al-oxides/hydroxides, carbonates, phosphates, etc., are associated with goethites in most natural occurrences, and the goethite is not generally separable from these mixtures by physical methods.
Low temperature, non-stoichiometric oxygen-isotope exchange coupled to Fe(II)-goethite interactions
2015, Geochimica et Cosmochimica ActaCitation Excerpt :Oxygen isotope compositions in ferric iron (oxyhydr)oxide minerals (iron oxides hereon) are potentially important proxies for paleoclimate (Yapp, 1987, 1991, 1993, 1998, 2000, 2008; Girard et al., 1997, 2000, 2002; Bao et al., 1999, 2000; Poage et al., 2000; Sjostrom et al., 2004; Tabor and Yapp, 2005; Hren et al., 2006), as they may record the temperature and composition of mineral formation water.
Oxygen isotope effects associated with substitution of Al for Fe in synthetic goethite: Some experimental evidence and the criterion of oxygen yield
2012, Geochimica et Cosmochimica Acta