Oxygen isotope exchange between dissolved phosphate and water at temperatures ≤135°C; inorganic versus biological fractionations

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doi: 10.1016/S0016-7037(99)00096-4
Authors:Lécuyer, Christophe; Grandjean, Patricia; Sheppard, Simon M. F.
Author Affiliations:Primary:
Ecole Normale Superieure de Lyon, Laboratoire de Sciences de la Terre, Lyons, France
Volume Title:Geochimica et Cosmochimica Acta
Source:Geochimica et Cosmochimica Acta, 63(6), p.855-862. Publisher: Pergamon, Oxford, International. ISSN: 0016-7037
Publication Date:1999
Note:In English. 37 refs.; illus., incl. 2 tables
Summary:The first experimental results are presented for the kinetic and equilibrium dissolved inorganic phosphate-H2O fractionation factor as a function of T. O isotope fractionations were measured between orthophosphate ions and water at 50-135°C. Biogenic apatites are systematically depleted in δ 18O by 80/00 at 20°C compared to dissolved phosphate. The activation energy is 134 kJ/mol and the kinetics of the homogeneous inorganic exchange reaction are slow at 10-13 to 10-11/sec when extrapolated to surface T. The results show that the isotopic composition of phosphates may be applied to identify the presence or absence of biogenic or microbial processes during the formation of phosphates. [R.K.H.]
Sections:Experimental mineralogy
Subsections:Non-silicates
Subjects:Apatite; Biogenic processes; Chemical fractionation; Experimental studies; Geochemical cycle; Geochemistry; Hydrology; Inorganic materials; Isotope fractionation; Isotope ratios; Isotopes; Kinetics; Laboratory studies; Nutrients; O-18/O-16; Oxygen; Phase equilibria; Phosphate ion; Phosphates; Rivers and streams; Solutes; Stable isotopes; Surface water; Temperature; Water
Abstract Numbers:00M/491
Record ID:1999046913
Copyright Information:GeoRef, Copyright 2019 American Geosciences Institute. Reference includes data from Mineralogical Abstracts, United Kingdom, Twickenham, United Kingdom
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040 |a ViAlAGI  |c ViAlAGI 
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100 1 |a Lécuyer, Christophe  |e analytic author  |u Ecole Normale Superieure de Lyon, Laboratoire de Sciences de la Terre, Lyons 
245 1 0 |a Oxygen isotope exchange between dissolved phosphate and water at temperatures ≤135°C; inorganic versus biological fractionations 
300 |a p. 855-862 
500 |a In English. 37 refs. 
500 |a Abstract number: 00M/491 
500 |a Abstractor: R.K.H. 
500 |a Category Section: Experimental mineralogy 
500 |a Category Subsection: Non-silicates 
500 |a Affiliation: Ecole Normale Superieure de Lyon, Laboratoire de Sciences de la Terre; Lyons; FRA; France 
500 |a Key title: Geochimica et Cosmochimica Acta 
500 |a Source note: Geochimica et Cosmochimica Acta, 63(6), p.855-862. Publisher: Pergamon, Oxford, International. ISSN: 0016-7037 
500 |a Publication type: journal article 
504 |b 37 refs. 
510 3 |a GeoRef, Copyright 2019 American Geosciences Institute. Reference includes data from Mineralogical Abstracts, United Kingdom, Twickenham, United Kingdom 
520 |a The first experimental results are presented for the kinetic and equilibrium dissolved inorganic phosphate-H<2`O fractionation factor as a function of T. O isotope fractionations were measured between orthophosphate ions and water at 50-135°C. Biogenic apatites are systematically depleted in δ >18`O by 80/00 at 20°C compared to dissolved phosphate. The activation energy is 134 kJ/mol and the kinetics of the homogeneous inorganic exchange reaction are slow at 10>-13` to 10>-11`/sec when extrapolated to surface T. The results show that the isotopic composition of phosphates may be applied to identify the presence or absence of biogenic or microbial processes during the formation of phosphates. 
650 7 |a Apatite  |2 georeft 
650 7 |a Biogenic processes  |2 georeft 
650 7 |a Chemical fractionation  |2 georeft 
650 7 |a Experimental studies  |2 georeft 
650 7 |a Geochemical cycle  |2 georeft 
650 7 |a Geochemistry  |2 georeft 
650 7 |a Hydrology  |2 georeft 
650 7 |a Inorganic materials  |2 georeft 
650 7 |a Isotope fractionation  |2 georeft 
650 7 |a Isotope ratios  |2 georeft 
650 7 |a Isotopes  |2 georeft 
650 7 |a Kinetics  |2 georeft 
650 7 |a Laboratory studies  |2 georeft 
650 7 |a Nutrients  |2 georeft 
650 7 |a O-18/O-16  |2 georeft 
650 7 |a Oxygen  |2 georeft 
650 7 |a Phase equilibria  |2 georeft 
650 7 |a Phosphate ion  |2 georeft 
650 7 |a Phosphates  |2 georeft 
650 7 |a Rivers and streams  |2 georeft 
650 7 |a Solutes  |2 georeft 
650 7 |a Stable isotopes  |2 georeft 
650 7 |a Surface water  |2 georeft 
650 7 |a Temperature  |2 georeft 
650 7 |a Water  |2 georeft 
700 1 |a Grandjean, Patricia,  |e analytic author 
700 1 |a Sheppard, Simon M. F.,  |e analytic author 
773 0 |t Geochimica et Cosmochimica Acta  |d Oxford : Pergamon, Mar. 1999  |x 0016-7037  |y GCACAK  |n Geochimica et Cosmochimica Acta, 63(6), p.855-862. Publisher: Pergamon, Oxford, International. ISSN: 0016-7037 Publication type: journal article  |g Vol. 63, no. 6  |h illus., incl. 2 tables 
856 |u urn:doi: 10.1016/S0016-7037(99)00096-4