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Oxygen-Isotope Fractionation between Aluminum-Hydroxide Phases and Water at <60°C: Results of Decade-Long Synthesis Experiments
Clays and clay minerals
Oxygen-isotope data were obtained for synthetic aluminum-hydroxide phases precipitated over 65-125 mo and have been compared to results from similar experiments conducted for 3-56 mo. The AI(OH)3 polymorphs, gibbsite, nordstrandite, and bayerite, were synthesized, but gibbsite was dominant in most samples, and commonly the only phase present. Using pure gibbsite samples, the following oxygen-isotope fractionation factors, c%jbbsite_n2o, were obtained: 1.0167 • 0.0003 (9 -+ 1~ 1.0147 • 0.0007doi:10.1346/ccmn.2000.0480209 fatcat:swkdysekjvhptora6dl7s4qade