Hydrogen and oxygen isotope fractionation between brucite and aqueous NaCl solutions from 250 to 450°C

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doi: 10.1016/S0016-7037(97)00346-3
Authors:Saccocia, Peter J.; Seewald, Jeffrey S.; Shanks, Wayne C., III
Author Affiliations:Primary:
Woods Hole Oceanographic Institution, Woods Hole, MA, United States
Other:
U. S. Geological Survey, United States
Volume Title:Geochimica et Cosmochimica Acta
Source:Geochimica et Cosmochimica Acta, 62(3), p.485-492. Publisher: Pergamon, Oxford, International. ISSN: 0016-7037
Publication Date:1998
Note:In English. 24 refs.; illus., incl. 2 tables
Summary:D/H and 18O/16O fractionation between brucite and NaCl solutions at 250-450°C and 0.5 kbar is reported and provides the first experimental calibration of this fractionation and places constraints on the effect of a dissolved salt on D/H fractionation at sub-and super-critical conditions. The results show that NaCl appears to have a small effect on D/H fractionation between minerals and aqueous solutions particularly for fluids near sea-water salinity. For O isotopes, measured values of 10001nαbr-sw (fractionation factor between brucite and aqueous NaCl solution) at 250 to 450°C indicate that brucite is depleted in 18O relative to coexisting NaCl solutions, and the degree of depletion decreases with increasing T and is not strongly dependent on salinity. For D/H fractionation 10001nαbr-sw values are -32 ± 60/00 (3.2 wt.% NaCl; 250°C), -21 ± 20/00 (10.0 wt.% NaCl; 350°C) and -22 ± 20/00 (3.2 wt.% NaCl; 450°C), indicating that brucite is depleted in D relative to coexisting aqueous NaCl solutions. [R.K.H.]
Sections:Experimental mineralogy
Subsections:Non-silicates
Subjects:Aqueous solutions; Brucite; Chemical composition; Coexisting minerals; D/H; Experimental studies; Fine-grained materials; Fluid phase; Hydrogen; Isotope fractionation; Isotope ratios; Isotopes; O-18/O-16; Oxides; Oxygen; Phase equilibria; Salinity; SEM data; Solution; Stable isotopes; Temperature
Abstract Numbers:98M/3769
Record ID:1998031171
Copyright Information:GeoRef, Copyright 2019 American Geosciences Institute. Reference includes data from Mineralogical Abstracts, United Kingdom, Twickenham, United Kingdom
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