Experimental calibration of silicon and oxygen isotope fractionations between quartz and water at 250°C by in situ microanalysis of experimental products and application to zoned low δ30Si quartz overgrowths

Pollington, Anthony D.; Kozdon, Reinhard; Anovitz, Lawrence M.; Georg, R. Bastian; Spicuzza, Michael J.; Valley, John W.

doi:10.1016/j.chemgeo.2015.11.011

Title: Experimental calibration of silicon and oxygen isotope fractionations between quartz and water at 250°C by in situ microanalysis of experimental products and application to zoned low δ³⁰Si quartz overgrowths

Journal Article · Tue Dec 01 00:00:00 EST 2015 · Chemical Geology

DOI:https://doi.org/10.1016/j.chemgeo.2015.11.011· OSTI ID:1255066

Pollington, Anthony D. ^[1]; Kozdon, Reinhard ^[2]; Anovitz, Lawrence M. ^[3]; Georg, R. Bastian ^[4]; Spicuzza, Michael J. ^[2]; Valley, John W. ^[2]

Los Alamos National Lab. (LANL), Los Alamos, NM (United States); Univ. of Wisconsin, Madison, WI (United States)
Univ. of Wisconsin, Madison, WI (United States)
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
Trent Univ., Peterborough, ON (Canada)

The interpretation of silicon isotope data for quartz is hampered by the lack of experimentally determined fractionation factors between quartz and fluid. Further, there is a large spread in published oxygen isotope fractionation factors at low temperatures, primarily due to extrapolation from experimental calibrations at high temperature. We report the first measurements of silicon isotope ratios from experimentally precipitated quartz and estimate the equilibrium fractionation vs. dissolved silica using a novel in situ analysis technique applying secondary ion mass spectrometry to directly analyze experimental products. These experiments also yield a new value for oxygen isotope fractionation. Quartz overgrowths up to 235 μm thick were precipitated in silica–H₂O–NaOH–NaCl fluids, at pH 12–13 and 250 °C. At this temperature, 1000lnα³⁰Si(Qtz–fluid) = 0.55 ± 0.10‰ and 1000lnα¹⁸O(Qtz–fluid) = 10.62 ± 0.13‰, yielding the relations 1000lnα³⁰Si(Qtz–fluid) = (0.15 ± 0.03) * 10⁶/T² and 1000lnα¹⁸O(Qtz–fluid) = (2.91 ± 0.04) * 10⁶/T² when extended to zero fractionation at infinite temperature. Values of δ³⁰Si(Qtz) from diagenetic cement in sandstones from the basal Cambrian Mt. Simon Formation in central North America range from 0 to ₋5.4‰. Paired δ¹⁸O and δ³⁰Si values from individual overgrowths preserve a record of Precambrian weathering and fluid transport. In conclusion, the application of the experimental quartz growth results to observations from natural sandstone samples suggests that precipitation of quartz at low temperatures in nature is dominated by kinetic, rather than equilibrium, processes.

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Research Organization:: Los Alamos National Laboratory (LANL), Los Alamos, NM (United States); Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Basic Energy Sciences (BES)

Grant/Contract Number:: AC52-06NA25396; 93ER14389; EAR-1053466; 1355590; AC05-00OR22725

OSTI ID:: 1255066

Alternate ID(s):: OSTI ID: 1286769; OSTI ID: 1398564

Report Number(s):: LA-UR-15-24608; PII: S0009254115301005

Journal Information:: Chemical Geology, Vol. 421, Issue C; ISSN 0009-2541

Publisher:: ElsevierCopyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 29 works

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Title: Experimental calibration of silicon and oxygen isotope fractionations between quartz and water at 250°C by in situ microanalysis of experimental products and application to zoned low δ30Si quartz overgrowths

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Title: Experimental calibration of silicon and oxygen isotope fractionations between quartz and water at 250°C by in situ microanalysis of experimental products and application to zoned low δ³⁰Si quartz overgrowths