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Carbonates and oxalates in sediments and landfill; monitors of death and decay in natural and artificial systems

David A. C. Manning
Carbonates and oxalates in sediments and landfill; monitors of death and decay in natural and artificial systems (in Palaeobiology meets geochemistry; concretions as tombs, John C. W. Cope (convener) and Charles D. Curtis (convener))
Journal of the Geological Society of London (January 2000) 157, Part 1: 229-238

Abstract

Subaqueous sediments and landfill waste disposal sites are both natural locations for anaerobic microbiological metabolism, where sulphates are reduced to sulphide, and organic matter (particularly acetate) is oxidized and degraded to produce ultimately CO (sub 2) and CH (sub 4) . The microbiologically mediated geochemical processes in each case are similar. However, natural sedimentary porewaters can be difficult to sample and monitor, whereas landfill sites are relatively easily accessible, yielding leachate samples that are routinely monitored over periods of time. In both environments, carbonate precipitation is predicted to be a normal consequence of anaerobic microbiological activity, consistent with changes in leachate composition and the predictions of geochemical modelling. Initial investigation of scale from a landfill drainage system confirms the presence of calcite, together with gypsum and iron minerals. Calcium oxalate minerals (whewellite and weddelite) are widespread in their occurrence within septarian concretions from a number of geological formations; whewellite is reportedly stable up to 160 degrees C. The solubility of calcium oxalate is very low, and precipitation readily takes place when oxalate (oxalic acid) is present (derived from fungal processes in sediments and soils). Calcium oxalate minerals should be expected wherever vegetable matter is decomposing; this link can be demonstrated for natural sediments, but has yet to be proven for landfill.


ISSN: 0016-7649
EISSN: 2041-479X
Coden: JGSLAS
Serial Title: Journal of the Geological Society of London
Serial Volume: 157, Part 1
Title: Carbonates and oxalates in sediments and landfill; monitors of death and decay in natural and artificial systems
Title: Palaeobiology meets geochemistry; concretions as tombs
Author(s): Manning, David A. C.
Author(s): Cope, John C. W.convener
Author(s): Curtis, Charles D.convener
Affiliation: University of Manchester, Department of Earth Sciences, Manchester, United Kingdom
Affiliation: Cardiff University, Department of Earth Sciences, Cardiff, United Kingdom
Pages: 229-238
Published: 200001
Text Language: English
Publisher: Geological Society of London, London, United Kingdom
Meeting name: 1998 Lyell meeting
Meeting location: London, GBR, United Kingdom
Meeting date: 199802Feb. 1998
References: 68
Accession Number: 2000-027967
Categories: Environmental geologySedimentary petrology
Document Type: Serial Conference document
Bibliographic Level: Analytic
Illustration Description: illus. incl. 4 tables
Secondary Affiliation: University of Manchester, GBR, United Kingdom
Country of Publication: United Kingdom
Secondary Affiliation: GeoRef, Copyright 2018, American Geosciences Institute. Reference includes data from The Geological Society, London, London, United Kingdom
Update Code: 200009
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