Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
6438426 | Geochimica et Cosmochimica Acta | 2014 | 20 Pages |
Abstract
Calculated magnitudes of silicon isotope fractionations between precipitated and dissolved silica (Î30Si = δ30Siprecipitate (calculated) â δ30Siinput solution) were â2.1â° at 10 °C, â1.2â° at 20 °C, â1.0â° at 30 °C, â0.5â° at 40 °C, 0.1â° at 50 °C, and 0.2â° at 60 °C (s.d. ⩽ 0.6â°, based on replicate experiments). Hence, fractionation was nearly insignificant at temperatures ⩾50 °C. Apart from this relationship with temperature, our results indicate that the effective Si isotope fractionation during precipitation from a solution is subject to changes in the saturation state, reactive surface area and flow regime. We therefore infer that, to a significant extent, solid-fluid fractionation in natural (near-) surface environments is system dependent.
Related Topics
Physical Sciences and Engineering
Earth and Planetary Sciences
Geochemistry and Petrology
Authors
Sonja Geilert, Pieter Z. Vroon, Desiree L. Roerdink, Philippe Van Cappellen, Manfred J. van Bergen,