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Title: Neutralization of atmospheric acidity by chemical weathering in an alpine drainage basin in the North Cascade mountains

Abstract

The most important weathering reaction that neutralizes incoming atmospheric acidity in the South Cascade Lake basin is weathering of calcite, which occurs in trace amounts in veins, on joint surfaces, and as a subglacial surficial deposit. Although the basin is underlain by igneous and high-grade metamorphic rocks, weathering of plagioclase is quantitatively negligible; the principal silicate weathering reaction is alteration of biotite to vermiculite. These conclusions are based on mass-balance calculations involving runoff compositions and on mineralogical observations. For predictive modeling of the effects of increased acid deposition, it is essential to identify the relevant weathering reactions. Feldspar weathering is commonly not an important source of solutes in alpine basins underlain by granitic rocks. 30 references, 2 figures, 1 table.

Authors:
;
Publication Date:
Research Org.:
Univ. of Wyoming, Laramie
OSTI Identifier:
5564313
Resource Type:
Journal Article
Journal Name:
Geology; (United States)
Additional Journal Information:
Journal Volume: 14:3
Country of Publication:
United States
Language:
English
Subject:
54 ENVIRONMENTAL SCIENCES; ACID RAIN; PH VALUE; CALCITE; ACID NEUTRALIZING CAPACITY; WEATHERING; ACIDIFICATION; CASCADE MOUNTAINS; FORECASTING; LAKES; MASS BALANCE; METAMORPHIC ROCKS; WASHINGTON; ALKALINE EARTH METAL COMPOUNDS; ATMOSPHERIC PRECIPITATIONS; CALCIUM CARBONATES; CALCIUM COMPOUNDS; CARBON COMPOUNDS; CARBONATE MINERALS; CARBONATES; CHEMISTRY; FEDERAL REGION X; MINERALS; MOUNTAINS; NORTH AMERICA; OXYGEN COMPOUNDS; RAIN; ROCKS; SURFACE WATERS; USA; WATER CHEMISTRY; 510200* - Environment, Terrestrial- Chemicals Monitoring & Transport- (-1989)

Citation Formats

Drever, J I, and Hurcomb, D R. Neutralization of atmospheric acidity by chemical weathering in an alpine drainage basin in the North Cascade mountains. United States: N. p., 1986. Web. doi:10.1130/0091-7613(1986)14<221:NOAABC>2.0.CO;2.
Drever, J I, & Hurcomb, D R. Neutralization of atmospheric acidity by chemical weathering in an alpine drainage basin in the North Cascade mountains. United States. https://doi.org/10.1130/0091-7613(1986)14<221:NOAABC>2.0.CO;2
Drever, J I, and Hurcomb, D R. 1986. "Neutralization of atmospheric acidity by chemical weathering in an alpine drainage basin in the North Cascade mountains". United States. https://doi.org/10.1130/0091-7613(1986)14<221:NOAABC>2.0.CO;2.
@article{osti_5564313,
title = {Neutralization of atmospheric acidity by chemical weathering in an alpine drainage basin in the North Cascade mountains},
author = {Drever, J I and Hurcomb, D R},
abstractNote = {The most important weathering reaction that neutralizes incoming atmospheric acidity in the South Cascade Lake basin is weathering of calcite, which occurs in trace amounts in veins, on joint surfaces, and as a subglacial surficial deposit. Although the basin is underlain by igneous and high-grade metamorphic rocks, weathering of plagioclase is quantitatively negligible; the principal silicate weathering reaction is alteration of biotite to vermiculite. These conclusions are based on mass-balance calculations involving runoff compositions and on mineralogical observations. For predictive modeling of the effects of increased acid deposition, it is essential to identify the relevant weathering reactions. Feldspar weathering is commonly not an important source of solutes in alpine basins underlain by granitic rocks. 30 references, 2 figures, 1 table.},
doi = {10.1130/0091-7613(1986)14<221:NOAABC>2.0.CO;2},
url = {https://www.osti.gov/biblio/5564313}, journal = {Geology; (United States)},
number = ,
volume = 14:3,
place = {United States},
year = {Sat Mar 01 00:00:00 EST 1986},
month = {Sat Mar 01 00:00:00 EST 1986}
}