Effects of pH, alkalinity and bedrock chemistry on metal concentrations of springs in an acidified catchment (Ecker Dam, Harz Mountains, FRG)

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doi: 10.1016/S0009-2541(99)00249-1
Authors:Frei, M.; Bielert, U.; Heinrichs, H.
Author Affiliations:Primary:
Geochemisches Institut, Gottingen, Federal Republic of Germany
Other:
University of Wollongong, Australia
Macauley Land Use Research Institute, United Kingdom
Volume Title:Laterites and paleoclimates; weathering processes and anthropogenic impact
Volume Authors:Probst, Jean-Luc, editor; Chivas, Allan R.; Wilson, M. Jeff
Source:Chemical Geology, 170(1-4), p.221-242; European Union of Geosciences, 9th biannual meeting (EUG 9), symposium on Weathering processes, mineral deposits and soil formation in tropical environments; and symposium on Anthropogenic impact on weathering processes; merged as symposium on Weathering processes and anthropogenic impact, Strasbourg, France, Mar. 23-27, 1997, edited by Jean-Luc Probst, Allan R. Chivas and M. Jeff Wilson. Publisher: Elsevier, Amsterdam, Netherlands. ISSN: 0009-2541
Publication Date:2000
Note:In English. 77 refs.; illus., incl. 5 tables, geol. sketch map
Summary:Thirty-four springs were sampled on five different source rocks in the upper Ecker watershed of the Northern Harz Mountains (Germany) four times during the course of 1995. The analyses included 41 cations and the major anions. Approximately 90% of the rocks in the upper Ecker watershed are low in basic cations, which inhibit the neutralisation of hydrogen-ion loading. As a consequence, the concentrations of Al, Fe, Mn, Zn, Pb, Y, Ce, As, La, Nd, Cd, Be, Co, Sb, Pr, Gd, Dy, Yb, Er, Sm, U, Tl, Ho and Tb of the Ecker dam water (pH = 5.1) exceed those of the nearby Sose Dam water (pH = 6.5) by almost one order of magnitude or more. With the exception of the spring waters on gabbro (pH up to 7.7) all waters on the highly siliceous rocks (quartzite, granite and gneiss) are dominated by sulfate anions with a pH range of 4-6. The concentrations of major conservative ions show a progressive increase with decreasing catchment elevation and decreasing average precipitation. Trace elements such as Sr, Be, Zn, Cd, Ba, Y, La, lanthanides, U, Li, Ni, Al, Mn, Co, Cu, Pb, As, Sb and Tl are increased in the low acid neutralizing capacity (ANC(aq)) spring waters. The behaviours of Sr, Be, Zn, Cd, Ba, Y, La, lanthanides and U resemble that of the major cations. The highest concentrations of Li and Ni are found on quartzite. Al, Mn, Co and Cu exhibit no clear correlation with catchment elevation and one particular bedrock. The concentrations of V and Cr show a distinct increase in high ANC(aq) spring waters on gabbro. Pb, As, Sb and Tl are characterized by being found in relatively high concentrations on granite at higher altitudes. Pb, As and Sb are affected by contaminated soils. The extreme variability of trace element concentrations of low ANC(aq) spring waters cannot be explained by the rock data. It is mainly controlled by the topography-dependent weathering rates of the different rock-types and the decreasing dilution with decreasing catchment elevation. Abstract Copyright (2000) Elsevier, B.V.
Sections:Clay minerals
Subsections:Petrology; weathering; soils
Subjects:Acidification; Alkalinity; Bedrock; Chemical weathering; Concentration; Drainage basins; Gabbros; Geochemistry; Gneisses; Granites; Ground water; Hydrochemistry; Igneous rocks; Metals; Metamorphic rocks; Mobility; PH; Plutonic rocks; Pollution; Quartzites; Reservoirs; Springs; Trace elements; Trace metals; Water treatment; Weathering; Central Europe; Europe; Germany; Harz Mountains; Lake Ecker
Coordinates:N524700 N525400 E0104200 E0103200
Abstract Numbers:01M/2489
Record ID:2000071794
Copyright Information:GeoRef, Copyright 2019 American Geosciences Institute. Reference includes data from CAPCAS, Elsevier Scientific Publishers, Amsterdam, Netherlands
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