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- W285356486 abstract "Corrensite, and ordered (R3) illite/smectite was observed in the Middle Ordovician Millbrig K-bentonite and in some stratigraphically higher K-bentonites in the Hamburg Klippe. The beds occur in the Oranda formation, and according to previously published conodont color alteration index, have been subjected to a very low grade metamorphic temperatures, on the order of 300 C. Ten samples representing a vertical profile through the thickness of the Millbrig bed were examined using XRD in the less than 5.0, 2.0, 0.5, 0.2, and smaller micrometer size fractions where applicable. High resolution XRD analysis of (060) reflections of the bulk clay were used in conjunction with computer model data, to identify corrensite, and to calculate I/S ratios. A demonstrable relationship between grain size and illite percentages through the bed exists. The abundance of corrensite increases with increasing grain size within the bed. Variations in illite percentages and the volumetric abundance are thought to be related to fluid migration through the bed. Magnesium supply for the formation of corrensite probably originated from a volumetrically equivalent amount of biotite. I/S conversion to illite may be the result of Ostwald ripening in conjunction with abundant pore water." @default.
- W285356486 created "2016-06-24" @default.
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- W285356486 date "1993-03-01" @default.
- W285356486 modified "2023-09-23" @default.
- W285356486 title "Occurrence of corrensite and ordered (R3) illite/smectite (I/S) in a VLGM Middle Ordovician K-bentonite from the Hamburg Klippe, central Pennsylvania" @default.
- W285356486 hasPublicationYear "1993" @default.
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