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- W1991495397 abstract "A study of the petrofabrics of Danian and uppermost Maastrichtian chalk from the North Sea was undertaken to investigate its particulate components and diagenetic history. Danian and Maastrichtian chalks are intensely mottled and burrowed globi-gerinid lime mudstones. The Danian chalk matrix is composed of coccolith and thoracosphaerid debris, whereas the Maastrichtian chalk matrix contains mainly coccoliths. The lower part of the Danian is often argillaceous. Three modes of lithification are evident—a spot-welding of adjacent grains (important in Danian chalk), selective overgrowths (prolific in Maastrichtian chalk), and a sparry calcite pore filling associated with Maastrichtian stylolitization. Not only does the scant cementation of chalk stem from an inadequate source of metastable calcium carbonate in the form of aragonite, but also indirectly in that extensive pressure-solution is impeded by certain pore fluid compositions. Pressure-solution can occur only at point contacts where a threshold linear pressure is exceeded and so allows an increase in calcite solubility. It is proposed that through the formation of spot-welds an initial rigid intergranular framework is constructed in chalk relatively early during diagenesis. Subsequent increases in overburden eventually permit extensive stylolitization and the late diagenetic reprecipitation of a sparry calcite pore filling adjacent to stylolites. The time and genesis of selective overgrowths is less clear." @default.
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- W1991495397 date "1975-11-01" @default.
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- W1991495397 title "Diagenetic history of a North Sea chalk" @default.
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- W1991495397 doi "https://doi.org/10.1111/j.1365-3091.1975.tb00248.x" @default.
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