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The formation and significance of irregularly shaped quartz grains in till (1980)

MAY, RONALD W.

Oxford, UK : Blackwell Publishing Ltd

Sedimentology 27 (1980), S. 0

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ISSN: 1365-3091

Source: Blackwell Publishing Journal Backfiles 1879-2005

Topics: Geosciences

Notes: Thin sections and scanning electron microscopy of quartz sand grains from till show clearly that a number of grains have been modified in place. The irregular grains result from the action of circulating alkaline groundwater, episodically concentrated by evaporation on fracture surfaces within grains and on concave surfaces produced by fracture during glacial transport. Evaporation increases the pH of the pore water and localizes its effect in small pores with a high capillary potential. Subsequent dilution by rainwater or snow meltwater flushes the system so that evaporation can repeat the process again. Solution rounding in terrigenous sediments has a number of ramifications for any interpretation based on textural maturity of the sediment.

Type of Medium: Electronic Resource

URL: http://dx.doi.org/10.1111/j.1365-3091.1980.tb01182.x

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Stochastic analysis of complex lithological successions (1982)

May, Ronald W. ; Jones, Brian

Springer

Mathematical geology 14 (1982), S. 405-417

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ISSN: 1573-8868

Keywords: Markov Chain ; carbonate sequences ; cluster analysis ; substitutability analysis ; entropy

Source: Springer Online Journal Archives 1860-2000

Topics: Geosciences , Mathematics

Notes: Abstract It is difficult to develop stochastic models for complex lithological sequences that are typically associated with intertidal-supratidal depositional environments. A sequence from the Upper Silurian Leopold Formation on eastern Somerset Island is used to demonstrate that a combination of cluster analysis, Markov Chain analysis, and substitutability analysis can give considerable insight into the nature of such complex successions. The high variability of this sequence was created by a combination of (a) variation in the depositional environment, (b) variation in the degree of dolomitization, (c) variation in the clastic influx, (d) random highenergy (possibly storm associated events) and (e) random breaks in the succession of depositional environments.