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Post-depositional evolution of mudstone; 1, Early days and parental influences

Charles D. Curtis
Post-depositional evolution of mudstone; 1, Early days and parental influences
Journal of the Geological Society of London (July 1995) 152, Part 4: 577-586


Ancient mudstones almost invariably record significant modification by very early diagenetic processes in the form of distinctive authigenic mineral assemblages. Earliest diagenesis is almost exclusively restricted to microbially-mediated redox reactions. Within recent unconsolidated sediments, these reactions take place in vertical sequences - the 'biogeochemical zones' of Claypool and Kaplan [1974]. Causal links can now be identified between early diagenetic mineral assemblages and microbial process zonation patterns; the patterns themselves vary systematically with depositional setting. One very important aspect of the depositional setting is rate of sediment accumulation; this rate determines which diagenetic minerals will form and also their amount as a proportion of the final sediments. This dependency permits early diagenesis and sea-level change to be linked through predictable lateral variation of biogeochemical zonation with sediment transport (or bypass). It also provides clues as to the development of cementstones and horizons with discrete concretions - both of which reflect fluctuations in sediment accumulation rate. These relationships suggest why some mudstones are more likely than others to cause cementation in sandstones as a consequence of compactional de-watering and solute export.

ISSN: 0016-7649
EISSN: 2041-479X
Serial Title: Journal of the Geological Society of London
Serial Volume: 152, Part 4
Title: Post-depositional evolution of mudstone; 1, Early days and parental influences
Author(s): Curtis, Charles D.
Affiliation: University of Manchester, Department of Earth Sciences, Manchester, United Kingdom
Pages: 577-586
Published: 199507
Text Language: English
Publisher: Geological Society of London, London, United Kingdom
References: 27
Accession Number: 1996-001079
Categories: Sedimentary petrology
Document Type: Serial
Bibliographic Level: Analytic
Illustration Description: illus. incl. 1 table
Country of Publication: United Kingdom
Secondary Affiliation: GeoRef, Copyright 2018, American Geosciences Institute. Reference includes data from Mineralogical Abstracts, United Kingdom, Twickenham, United Kingdom
Update Code: 199601
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