Reeder, Richard J. and Valley, John W. and Graham, Colin M. and Eiler, John M. (1997) Ion microprobe study of oxygen isotopic compositions of structurally nonequivalent growth surfaces on synthetic calcite. Geochimica et Cosmochimica Acta, 61 (23). pp. 5057-5063. ISSN 0016-7037 http://resolver.caltech.edu/CaltechAUTHORS:20121023-141543295
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A synthetic calcite crystal that exhibits surface-structure-controlled, differential incorporation of a trace element was examined by ion microprobe to determine whether the controls causing differential element incorporation have a corresponding influence on incorporation of oxygen isotopes. In contrast both to the behavior of trace elements and to several previous studies claiming surface structural control on isotopic fractionation, the synthetic calcite fails to show any such surface effect. These ion probe experiments also represent the first isotopic analyses of symmetrically nonequivalent vicinal faces that compose the flanks of growth spirals. Hence we establish that structurally nonequivalent growth steps, which also differ in growth step velocity, and occurring on a single crystal face, show no measurable difference in fractionation during low-temperature solution growth. Although our findings for a synthetic crystal differ from other reports for natural crystals that were based on different techniques and larger sample size, our results are consistent with the view that surface-site preferences during growth are not significantly sensitive to the slight mass and vibrational differences among light stable isotopes.
|Additional Information:||© 1997 Elsevier Science Ltd. Received June 14, !997; accepted in revised form August 19, 1997. John Craven is thanked for assistance in all stages of the ion microprobe analysis and for helpful comments on the paper. Mike Spicuzza analyzed the calcite crystals by acid dissolution at the University of Wisconsin. John Rakovan is thanked for comments on the paper and for useful discussions. This research was supported by NSF-EAR94-05046 to RJR, and NSF-EAR93-04372 and DOE-93ER-14389 to JWV. The Ion Microprobe Lab in Edinburgh is supported by NERC.|
|Official Citation:||Richard J. Reeder, John W. Valley, Colin M. Graham, John M. Eiler, Ion microprobe study of oxygen isotopic compositions of structurally nonequivalent growth surfaces on synthetic calcite, Geochimica et Cosmochimica Acta, Volume 61, Issue 23, December 1997, Pages 5057-5063, ISSN 0016-7037, 10.1016/S0016-7037(97)00309-8. (http://www.sciencedirect.com/science/article/pii/S0016703797003098)|
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|Deposited By:||Ruth Sustaita|
|Deposited On:||23 Oct 2012 21:33|
|Last Modified:||23 Oct 2012 21:33|
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