Laboratory-simulated diagenesis of nontronite
Miller, Matthew A. (University of Oklahoma. School of Geology and Geophysics)
Madden, Andrew S. (University of Oklahoma. School of Geology and Geophysics)
Megan Elwood, Madden (University of Oklahoma. School of Geology and Geophysics)
Douglas, Elmore R. (University of Oklahoma. School of Geology and Geophysics)

Date:	2012
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 ° 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.
Rights:	Tots els drets reservats.
Language:	Anglès
Document:	Article ; recerca ; Versió publicada
Subject:	Diagenesis ; Ferroceladonite ; Illite-Smectite ; Iron ; Nontronite ; TEM ; XRD
Published in:	Clays and Clay Minerals, Vol. 60, Núm. 6 (2012) , p. 616-632, ISSN 1552-8367

DOI: 10.1346/CCMN.2012.0600607

17 p, 1.5 MB  UAB restricted access

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