Processes affecting groundwater chemistry in a zone of saline intrusion into an urban sandstone aquifer

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doi: 10.1016/S0883-2927(98)00006-7
Authors:Barker, Andrew P.; Newton, Robert J.; Bottrell, Simon H.; Tellam, J. H.
Author Affiliations:Primary:
University of Leeds, Department of Earth Sciences, Leeds, United Kingdom
University of Birmingham, United Kingdom
Volume Title:Applied Geochemistry
Source:Applied Geochemistry, 13(6), p.735-749. Publisher: Pergamon, Oxford-New York-Beijing, International. ISSN: 0883-2927
Publication Date:1998
Note:In English. 52 refs.; illus., incl. sects., 2 tables, sketch maps
Summary:Cation and anion concentrations, δ 34S and δ 18O in SO4, δ 13C in dissolved inorganic C and 87Sr/86Sr in samples collected from railway tunnels to obtain a profile through the saline-freshwater mixing zone demonstrate that the presence of a low permeability fault exerts a strong control on ground water chemistry in the Triassic sandstone aquifer beneath Liverpool and the Mersey estuary, UK. On the estuary side of the fault groundwater chemistry is dominated by mixing of estuary water and fresh ground water. Groundwater chemistry on the landward side of the fault is primarily the result of recharge in an urban environment. There is evidence that saline water was once present on the landward side of the fault but has been flushed out by fresh groundwater. This saline water would have either been transported from the landward side of the fault nearer the estuary or transmitted across the fault in response to water abstraction earlier this century. A tracer test from a borehole to the tunnels showed multiple breakthroughs to some locations indicating a number of different low paths through the aquifer with a maximum velocity of 140 m/d suggesting flow along fractures. [M.E.H.]
Subjects:Alkaline earth metals; Aquifers; Chloride ion; Chlorine; Clastic rocks; Fresh water; Geochemistry; Ground water; Halogens; Hydrochemistry; Isotope ratios; Isotopes; Mesozoic; Metals; Mixing; Nitrate ion; O-18/O-16; Oxidation; Oxygen; Processes; Reduction; S-34/S-32; Salt water; Salt-water intrusion; Sampling; Sandstone; Sedimentary rocks; Solutes; Sr-87/Sr-86; Stable isotopes; Strontium; Sulfur; Triassic; Urban environment; Velocity; England; Europe; Great Britain; United Kingdom; Western Europe; Castle Street Fault; Cheshire Basin; Liverpool England; Mersey Estuary
Coordinates:N531500 N534500 W0024500 W0031500
Abstract Numbers:99M/1824
Record ID:1998070398
Copyright Information:GeoRef, Copyright 2019 American Geosciences Institute. Reference includes data from Mineralogical Abstracts, United Kingdom, Twickenham, United Kingdom
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