Clays and Clay Minerals, Vol. 60, No. 6, 616–632, 2012.
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Authors
Miller, Matthew A.
Madden, Andrew S.
Madden, Megan Elwood
Elmore, R. Douglas
Issue Date
2012
Type
Article
Language
Keywords
Periodicals , Geology , Diagenesis , Ferroceladonite , Illite-Smectite , Iron , Nontronite , TEM , XRD
Alternative Title
Laboratory-simulated Diagenesis Of Nontronite
Abstract
Nontronite NAu-1 was exposed to moderate temperature and pressure conditions (250 and 300ºC 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 A ˚ 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.
Description
gsccm60607-mil.pdf -- 1,934 KB
Citation
Clays and Clay Minerals, Vol. 60, No. 6, 616–632, 2012.
Publisher
The Clay Minerals Society
License
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