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Laboratory-Simulated Diagenesis of Nontronite

Published online by Cambridge University Press:  01 January 2024

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

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.

Keywords

DiagenesisFerroceladoniteIllite-SmectiteIronNontroniteTEMXRD
Type
Article
Information
Clays and Clay Minerals , Volume 60 , Issue 6 , December 2012 , pp. 616 - 632
Copyright
Copyright © Clay Minerals Society 2012

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