Controls on bacterial sulphate reduction in a dual porosity aquifer system; the Lincolnshire Limestone Aquifer, England

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doi: 10.1016/S0009-2541(00)00222-9
Authors:Bottrell, Simon H.; Moncaster, Stephen J.; Tellam, John H.; Lloyd, John W.; Fisher, Quentin J.; Newton, Rob J.
Author Affiliations:Primary:
University of Leeds, School of Earth Sciences, Leeds, United Kingdom
Northern Arizona University, United States
University of Birmingham, Birmingham, United Kingdom
Volume Title:Geomicrobiology technical session 06; 110th Geological Society of America annual meeting, Toronto, October 26-29, 1998
Volume Authors:Konhauser, Kurt O., editor; Southam, Gordon
Source:Chemical Geology, 169(3-4), p.461-470; Geological Society of America, 110th annual meeting, symposium on Geomicrobiology, Toronto, ON, Canada, Oct. 26-29, 1998, edited by Kurt O. Konhauser and Gordon Southam. Publisher: Elsevier, Amsterdam, Netherlands. ISSN: 0009-2541
Publication Date:2000
Note:In English. 38 refs.; illus., incl. sect., 1 table, sketch map
Summary:Chemical and sulphur isotopic analyses are presented of fissure-waters and pore-waters in the deep confined zone of a dual porosity carbonate aquifer. Some of the fissure-waters show good evidence for bacterial sulphate reduction, with low concentrations of sulphide present which is strongly to moderately depleted in 34S relative to sulphate. The sulphur geochemistry is best interpreted as mixing between: (i) a reduced water with sulphide ∼60 per mil depleted in 34S relative to sulphate; and (ii) a sulphate-rich water from up-dip in the aquifer. In addition, sulphide oxidation occurs where sufficiently oxidizing water is drawn in by abstractions. The large isotope fractionation factor associated with the sulphidic waters is probably the result of redox cycling of sulphur with little net reduction, rather than a true kinetic fractionation factor. By contrast, pore-waters in the "sulphate reducing zone" show little or no evidence for the effects of sulphate reduction, despite the fact that the pore-waters represent a significant reservoir of sulphate for reduction. Some pore-waters have been modified recognizably by diffusional exchange with the fissure-waters, but the aquifer matrix has not been colonized by sulphate reducing bacteria, probably because porethroats in the limestone are too small for bacteria to pass. Physical exclusion of bacteria from the aquifer matrix and limited diffusional exchange are likely to exert fundamental controls on bacterial redox processes in dual porosity aquifer systems and other systems with low permeability due to small pore interconnections. Abstract Copyright (2000) Elsevier, B.V.
Subjects:Aquifers; Biochemistry; Biogenic processes; Biomineralization; Carbonate rocks; Confined aquifers; Controls; Eh; Geochemistry; Geomicrobiology; Ground water; Hydrochemistry; Isotope ratios; Isotopes; Jurassic; Limestone; Lincolnshire Limestone; Mesozoic; Microorganisms; Porosity; Reduction; S-34/S-32; Sedimentary rocks; Stable isotopes; Sulfate ion; Sulfur; England; Europe; Great Britain; Lincolnshire England; United Kingdom; Western Europe; Bacteria; Sleaford England
Coordinates:N520000 N520000 E0003000 E0003000
Abstract Numbers:02M/2807
Record ID:2000068927
Copyright Information:GeoRef, Copyright 2019 American Geosciences Institute. Reference includes data from CAPCAS, Elsevier Scientific Publishers, Amsterdam, Netherlands
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