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Clay mineral reaction progress – the maturity and burial history of the Lias Group of England and Wales

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The clay mineral assemblages and microtextures of a suite of mudrocks from the Lias Group of England and Wales indicate important regional differences in burial history. Samples from the northern Cleveland Basin are characterized by illite-smectite (I–S, 90% illite) and little carbonate whilst samples from the southern Worcester and Wessex basins contain less mature discrete smectite and are often calcite- and dolomite-rich. Lias Group rocks have been buried to 4 km in the Cleveland Basin but to <2 km in the Worcester and Wessex basins. Burial in the Cleveland Basin is deeper than previously estimated and does not need a local heating event. Illite- smectite (80% illite) detected in samples from the East Midlands Shelf suggests burial to 3 km, again deeper than previous estimates for this region.
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Keywords: BASIN MATURITY; CLAY DIAGENESIS; ILLITE-SMECTITE; LIAS GROUP; SEM; SMECTITE; SURFACE AREA; TEM; XRD

Document Type: Research Article

Publication date: 2005-03-01

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