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- W2044434902 abstract "Abstract Chemical analyses of the <0.2 μm illite-smectite (I-S) fraction from K-bentonites in Silurian age sediments sampled from three different localities in the Southern Uplands of Scotland and Northern Ireland indicate that the I-S from the three localities shows differences in both K + content and the degree of Tschermak substitution of octahedral Al 3+ for Mg 2+ . The K + content correlates with percentage expandability (%E) of I-S as determined by X-ray diffraction (XRD), but both these parameters show poor correlation with palaeotemperature as estimated by organic reflectance methods. Octahedral Mg 2+ content shows an inverse correlation with Al 3+ , and both these parameters show a good correlation with estimated palaeotemperature. Although K-substitution has been retarded at Dob's Linn, the region subjected to the highest temperature, Tschermak substitution of Al 3+ for Mg 2+ has apparently continued. In these K-bentonites, Tschermak substitution appears to be a better indicator of palaeotemperature than K-substitution." @default.
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- W2044434902 date "1995-03-01" @default.
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- W2044434902 title "Tschermak substitution as an indicator of palaeotemperature in Silurian K-bentonites from the Southern Uplands of Scotland and Northern Ireland" @default.
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- W2044434902 doi "https://doi.org/10.1180/claymin.1995.030.1.02" @default.
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