-Chemical analysis by X-ray fluorescence (XRF) and calculated structural formulae of clay-size fractions of smectites from Cretaceous bentonites and illitic clays from Cretaceous, Devonian, and Ordovician bentonites and Jurassic and Permian sandstones indicate the nature and extent of various types of ionic substitution. The determination of tetrahedral (A1, Si) and octahedral (A1, Mg, Fe) comp...

Aqueous suspensions of exfoliated Li0 .25MoO 3 and Na-montmorillonite have been combined and dried to form interstratified solids. X-ray diffraction patterns of ethylene glycol treated films show that the d-spacing of restacked materials varies with composition between the limits established by the two end members. Based on these data, we conclude that the new materials are composed of individu...

The detailed mineralogy of the Bullfrog and Tram Members of the Crater Flat Tuff from drill hole USW-G1 has been examined, primarily to characterize fully the amounts and types of clay minerals in the tuffs and the possible effects clay minerals have on rock properties. Results of bulk sample x-ray diffraction analyses agree closely with previous determinations, although slightly higher clay mi...

A radiocarbon date of 19 100 ±100 yr BP (SUA 2856) dates the maximum extent ofglacier ice at Lake Beatrice in the upper Dante IJ ,,,,,,I,,>r 1'1 •• ... nrlrrh", Late Wisconsin in western Tasmania. Study ofthe Dante Glacier outwash fan deposits shows that rna'l:'Or'\'vlT(~'r"hr',e'; a lDalaec~soJ and an older outwash formation, and are interstratified with fluvial silts detritus deposited of the...

Identification of clay minerals based on chemometric analysis of measured infrared (IR) spectra was suggested. IR spectra were collected using the diffuse reflection technique. Discriminant analysis and principal component analysis were used as chemometric methods. Four statistical models were created for separation and identification of clay minerals. More than 50 samples of various clay miner...

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