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Laboratory-Simulated Diagenesis of Nontronite

Published online by Cambridge University Press:  01 January 2024

Matthew A. Miller
School of Geology and Geophysics, University of Oklahoma, 100 East Boyd Street, Suite 710, Norman, OK 73019, USA
Andrew S. Madden*
School of Geology and Geophysics, University of Oklahoma, 100 East Boyd Street, Suite 710, Norman, OK 73019, USA
Megan Elwood Madden
School of Geology and Geophysics, University of Oklahoma, 100 East Boyd Street, Suite 710, Norman, OK 73019, USA
R. Douglas Elmore
School of Geology and Geophysics, University of Oklahoma, 100 East Boyd Street, Suite 710, Norman, OK 73019, USA
*E-mail address of corresponding author:


Nontronite NAu-1 was exposed to moderate temperature and pressure conditions (250 and 300°C at 100 MPa pressure) in KCl brine to simulate burial diagenetic systems over accelerated time periods appropriate for laboratory experiments. Powder X-ray diffraction and transmission electron microscopy analysis of the coexisting mixed-layer and discrete 10 Å clay reaction products, and inductively coupled plasma-mass spectrometry analysis of the remaining fluids, indicated that the clay retained octahedral Fe and was identified as Fe-celadonite. The release of Fe from smectite during burial diagenesis has been hypothesized as a mechanism for magnetite authigenesis. High Al activity relative to Fe may be critical to the formation of an aluminous illite and any associated authigenic magnetite.

Copyright © Clay Minerals Society 2012

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