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Geochemical and mineralogical properties of the Lower Callovian (Jurassic) Kellaways Sand, variations in trace element concentrations and implications for hydrogeological risk assessment

Scotney, P.M., Joseph, J.B., Marshall, J.E.A., Lowe, M.J., Croudace, I.W. and Milton, J.A. (2012) Geochemical and mineralogical properties of the Lower Callovian (Jurassic) Kellaways Sand, variations in trace element concentrations and implications for hydrogeological risk assessment Quarterly Journal of Engineering Geology and Hydrogeology, 45, (1), pp. 45-60. (doi:10.1144/1470-9236/11-005).

Record type: Article

Abstract

This paper provides details of the trace element and total organic carbon (TOC) content of the Lower Callovian Kellaways Sand. Heavy metals are associated with mineral phases such as pyrite, iron and manganese oxyhydroxides, organic matter and clay minerals, and correlations are varied. Using a multi-disciplinary approach and geochemical comparisons it has been shown that the Kellaways Sand is particularly enriched in Cr. Cr concentration data suggest two separate components, one bound with Ni and MnO, and the other occurring as an accessory resistate phase Fe–Ti–Cr oxide (ulvöspinel) with up to 4.7 wt% Cr2O3. The closest correlations between matrices are Zn and Ni with Fe2O3; V, Ni, Rb and Ga with MnO, MgO and K2O; Ni and MnO with TOC; and Cd with Zn. Average concentrations for trace elements and TOC are generally enriched in both the Oxford and Kellaways clays. Variable concentrations of SO4 in associated groundwaters indicate that oxidation of FeS2 influences the ranges and concentrations of trace elements observed through Eh and pH controlled adsorption or desorption reactions. The natural and variable concentrations of the metals that also occur in associated groundwaters (including Hg, Cd, Ni, As and Pb) have important implications for the associated, risk-based
hydrogeological assessments completed for landfill sites contained within the Oxford Clay, and affect the choice of priority determinants significantly for the monitoring control and trigger levels.

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More information

Published date: 2012
Organisations: Geochemistry, Paleooceanography & Palaeoclimate

Identifiers

Local EPrints ID: 336380
URI: http://eprints.soton.ac.uk/id/eprint/336380
ISSN: 1470-9236
PURE UUID: a7ea3a94-7687-4fd1-8bd2-7f944e44b719
ORCID for J.E.A. Marshall: ORCID iD orcid.org/0000-0002-9242-3646

Catalogue record

Date deposited: 22 Mar 2012 15:17
Last modified: 18 Jul 2017 06:08

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Contributors

Author: P.M. Scotney
Author: J.B. Joseph
Author: J.E.A. Marshall ORCID iD
Author: M.J. Lowe
Author: I.W. Croudace
Author: J.A. Milton

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