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Oxygen isotope fractionation between analcime and water - An experimental studyThe oxygen isotope fractionation between analcime and water is studied to test the feasibility of using zeolites as low-temperature thermometers. The fractionation of oxygen isotopes between natural analcime and water is determined at 300, 350, and 400 C, and at fluid pressures ranging from 1.5 to 5.0 kbar. Also, isotope ratios for the analcime framework, the channel water, and bulk water are obtained. The results suggest that the channel water is depleted in O-18 relative to bulk water by a constant value of about 5 percent, nearly independent of temperature. The analcime-water fractionation curve is presented, showing that the exchange has little effect on grain morphology and does not involve recrystallization. The exchange is faster than any other observed for a silicate. The exchange rates suggest that zeolites in active high-temperature geothermal areas are in oxygen isotopic equilibrium with ambient fluids. It is concluded that calibrated zeolites may be excellent low-temperature oxygen isotope geothermometers.
Document ID
19900049316
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
Authors
Karlsson, Haraldur R.
(NASA Johnson Space Center Houston, TX; Chicago, University, IL, United States)
Clayton, Robert N.
(Chicago, University IL, United States)
Date Acquired
August 14, 2013
Publication Date
May 1, 1990
Publication Information
Publication: Geochimica et Cosmochimica Acta
Volume: 54
ISSN: 0016-7037
Subject Category
Geophysics
Accession Number
90A36371
Funding Number(s)
CONTRACT_GRANT: NSF EAR-86-16255
Distribution Limits
Public
Copyright
Other

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