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Weathering of Hornblende to Ferruginous Products by a Dissolution-Reprecipitation Mechanism: Petrography and Stoichiometry

Published online by Cambridge University Press:  02 April 2024

Michael Anthony Velbel
Michael Anthony Velbel*
Affiliation:
Department of Geological Sciences, 206 Natural Science Building, Michigan State University, East Lansing, Michigan 48824
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Abstract

Hornblende of the Carrol Knob mafic complex (southern Blue Ridge Mountains, North Carolina) has weathered under humid, temperate conditions. Hornblende weathering appears to have been a dissolution-reprecipitation reaction, in which hornblende dissolved stoichiometrically, and the ferruginous and aluminous weathering products (goethite, gibbsite, and kaolinite) precipitated from solution (neoformation). During the earliest stage of alteration, ferruginous weathering products formed as linings of fractures within and around crystals and cleavage fragments of hornblende. Side-by-side coalescence of lenticular etch pits during more advanced weathering produced characteristic “denticulated” terminations on hornblende remnants in dissolution cavities bounded by ferruginous boxworks. Dissolution cavities are devoid of weathering products. Small “pendants” of ferruginous material project from the boxwork into void spaces. Because these products are separated from the hornblende remnants by void space, they must have been produced by dissolution-reprecipitation reactions. Complete removal of the parent hornblende left a ferruginous microboxwork or “negative pseudomorph.” Only Al and Fe were conserved over microscopic distances; alkali and alkaline-earth elements were stoichiometrically removed from the weathering microenvironment during the weathering process.

Keywords

GibbsiteGoethiteHornblendeIronKaoliniteNeoformationPetrographyScanning electron microscopyWeathering
Type
Research Article
Information
Clays and Clay Minerals , Volume 37 , Issue 6 , December 1989 , pp. 515 - 524
Copyright
Copyright © 1989, The Clay Minerals Society

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References

American Geological Institute (1976) Dictionary of Geologic Terms: Revised ed., Matthews, W. H. 3rd and Boyer, R. E., eds., Anchor Press/Doubleday, Garden City, New York, 472 pp.Google Scholar
Anand, R. R. and Gilkes, R. J., 1984 Weathering of hornblende, plagioclase and chlorite in meta-dolerite, Australia Geoderma 34 261 – 280.CrossRefGoogle Scholar
Anand, R. R., Gilkes, R. J., Armitage, T. M. and Hillyer, J. W., 1985 Feldspar weathering in lateritic saprolite Clays & Clay Minerals 33 31 – 43.CrossRefGoogle Scholar
April, R. A., Newton, R. M. and Coles, L. T., 1986 Chemical weathering in two Adirondack watersheds: Past and present-day rates Geol. Soc. Amer. Bull. 97 1232 – 1238.2.0.CO;2>CrossRefGoogle Scholar
Basham, I. R., 1974 Mineralogical changes associated with deep weathering of gabbro in Aberdeenshire Clay Miner. 10 189 – 202.CrossRefGoogle Scholar
Berner, R. A. and Schott, J., 1982 Mechanism of pyroxene and amphibole weathering—II. Observations of soil grains Amer. J. Sci. 282 1214 – 1231.CrossRefGoogle Scholar
Berner, R. A., Sjöberg, E. L., Velbel, M. A. and Krom, M. D., 1980 Dissolution of pyroxenes and amphiboles during weathering Science 207 1205 – 1206.CrossRefGoogle ScholarPubMed
Berner, R. A., Holdren, G. R. Jr. and Schott, J., 1985 Surface layers on dissolving silicates (Comments on “Study of the weathering of albite at room temperature and pressure with a fluidized bed reactor” by L. Chou and R. Wol-last) Geochim. Cosmochim. Acta 49 1657 – 1658.CrossRefGoogle Scholar
Bricker, O. P., 1986 Geochemical investigations of selected eastern United States watersheds affected by acid deposition J. Geol. Soc, London 143 621 – 626.CrossRefGoogle Scholar
Cleaves, E. T. (1974) Petrologie and chemical investigation of chemical weathering in mafic rocks, eastern piedmont of Maryland: Maryland Geol. Surv. Rept. Invest. 25, 38 pp.Google Scholar
Cole, W. F. and Lancucki, C. J., 1976 Montmorillonite pseudomorphs after amphibole from Melbourne, Australia Clays & Clay Minerals 24 79 – 83.CrossRefGoogle Scholar
Colin, F., Noack, Y., Trescases, J.-J. and Nahon, D., 1985 L’altération laterique debutante des pyroxenites de Jacuba, Niquelandia, Brésil Clay Miner. 20 93 – 113.CrossRefGoogle Scholar
Colman, S. M. (1982) Chemical weathering of basalts and andésites: Evidence from weathering rinds: U.S. Geol. Sum. Prof. Pap. 1246, 51 pp.Google Scholar
Cressey, B. A., 1979 Electron microscopy of serpentinite textures Can. Mineral. 17 741 – 756.Google Scholar
Deer, W. A., Howie, R. A. and Zussman, J. (1963) Rock-Forming Minerals, Vol. 2, Chain Silicates: Longmans, London, 379 pp.Google Scholar
Delvigne, J., 1983 Micromorphology of the alteration and weathering of pyroxenes in the Koua Bocca ultramafic intrusion, Ivory Coast, West Africa Petrologie des Alterations et des Sols 72 57 – 68.Google Scholar
Drever, J. I., 1973 The preparation of oriented clay mineral specimens for X-ray diffraction analysis by a filter-membrane peel technique Amer. Mineral. 58 553 – 554.Google Scholar
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 Geology 14 221 – 224.2.0.CO;2>CrossRefGoogle Scholar
Duchaufour, P., 1982 Pedology London T. R. Paton, transi.: George Allen & Unwin.CrossRefGoogle Scholar
Eggleton, R. A., 1975 Nontronite topotaxial after heden-bergite Amer. Mineral. 60 1063 – 1068.Google Scholar
Eggleton, R. A., Colman, S. M. and Dethier, D. P., 1986 The relation between crystal structure and silicate weathering rates Rates of Chemical Weathering of Rocks and Minerals New York Academic Press 21 – 40.Google Scholar
Eggleton, R. A. and Boland, J. N., 1982 Weathering of enstatite to talc through a sequence of transitional phases Clays & Clay Minerals 30 11 – 20.CrossRefGoogle Scholar
Eggleton, R. A., Foudoulis, C. and Varkevisser, D., 1987 Weathering of basalt: Changes in rock chemistry and mineralogy Clays & Clay Minerals 35 161 – 169.CrossRefGoogle Scholar
Eslinger, E. and Pevear, D. (1988) Clay Minerals for Petroleum Geologists and Engineers: Soc. Econ. Paleo. Mineral. Short Course Notes 22, 422 pp.Google Scholar
Fontanaud, A. and Meunier, A., 1983 Mineralogical facies of a weathered serpentinized lherzolite from the Pyrenees, France Clay Miner 18 77 – 88.CrossRefGoogle Scholar
Glasmann, J. R., 1982 Alteration of andésite in wet, unstable soils of Oregon’s western Cascades Clays & Clay Minerals 30 253 – 263.CrossRefGoogle Scholar
Grant, W. H. and Swineford, A., 1963 Weathering of Stone Mountain Granite Clays and Clay Minerals, Proc. 11th Natl. Conf, Ottawa, Ontario, 1962 New York Pergamon Press 65 – 73.Google Scholar
Grant, W. H., 1964 Chemical weathering of biotite-plagio-clase gneiss Clays & Clay Minerals 12 455 – 463.Google Scholar
Hatcher, R. D., 1979 The Coweeta Group and Coweeta syncline: Major features of the North Carolina-Georgia Blue Ridge Southeastern Geol. 21 17 – 29.Google Scholar
Hatcher, R. D., 1980 Geologic map and mineral resources summary of the Prentiss Quadrangle, North Carolina, including geologic map of Coweeta Laboratory North Carolina Dept. Nat. Resources and Community Devel., Geol. Surv. Sect. .Google Scholar
Helms, T. S., McSween, H. Y. Jr. Labotka, T. C. and Ja-rosewich, E., 1987 Petrology of a Georgia Blue Ridge amphibolite unit with hornblende + gedrite + kyanite + staurolite Amer. Mineral. 72 1086 – 1096.Google Scholar
Katz, B. G., Bricker, O. P. and Kennedy, M. M., 1985 Geochemical mass-balance relationships for selected ions in precipitation and stream water, Catoctin Mountains, Maryland Amer. J. Sci. 285 931 – 962.CrossRefGoogle Scholar
Kerr, P. F., 1977 Optical Mineralogy 4th New York McGraw-Hill.Google Scholar
Koppi, A. J. and Williams, D. J., 1980 Weathering and development of two contrasting soils formed from grano-diorite in south-east Queensland Aust. J. Soil Res. 18 257 – 271.CrossRefGoogle Scholar
McSween, H. Y. Jr. and Hatcher, R. D. Jr., 1985 Ophio-lites (?) of the southern Appalachian Blue Ridge Field Trips in the Southern Appalachians 9 144 – 170.Google Scholar
Mogk, D. W. and Locke, W. W. III., 1988 Application of auger electron spectroscopy (AES) to naturally weathered hornblende Geochim. Cosmochim. Acta 52 2537 – 2542.CrossRefGoogle Scholar
Nahon, D. and Bocquier, G., 1983 Petrology of elements transfers in weathering and soil systems Petrologie des Altérations et des Sols, Vol. 2 72 111 – 119.Google Scholar
Nahon, D. B. and Colin, F., 1982 Chemical weathering of orthopyroxenes under lateritic conditions Amer. J. Sci. 282 1232 – 1243.CrossRefGoogle Scholar
Nahon, D., Colin, F. and Tardy, Y., 1982 Formation and distribution of Mg,Fe,Mn-smectites in the first stages of the lateritic weathering of forsterite and tephroite Clay Miner. 17 339 – 348.CrossRefGoogle Scholar
Parisot, J. C., Delvigne, J. and Groke, M. T. C., 1983 Pet-rographical aspects of the supergene weathering of garnet in the Serra dos Carajas (Para, Brazil) Petrologie des Altérations et des Sols, Vol. 2 72 141 – 148.Google Scholar
Petit, J.-C. Della Mea, G., Dran, J.-C. Schott, J. and Berner, R. A., 1987 Mechanism of diopside dissolution from hydrogen depth profiling Nature 325 705 – 707.CrossRefGoogle Scholar
Pettijohn, F. J., Potter, P. E. and Siever, R., 1987 Sand and Sandstone 2nd New York Springer-Verlag.CrossRefGoogle Scholar
Proust, D., van Olphenand, H. and Veniale, F., 1982 Supergene alteration of hornblende in an amphibolite from Massif Central, France Proc. Int. Clay Conf., Bologna, Pavia, 1981 Amsterdam Elsevier 357 – 364.Google Scholar
Proust, D., 1985 Amphibole weathering in a glaucophane-schist (Ile de Groix, Morbihan, France) Clay Miner. 20 161 – 170.CrossRefGoogle Scholar
Schott, J. and Berner, R. A., 1983 X-ray photoelectron studies of the mechanism of iron silicate dissolution during weathering Geochim. Cosmochim. Acta 47 2233 – 2240.CrossRefGoogle Scholar
Schott, J., Berner, R. A. and Drever, J. I., 1985 Dissolution mechanisms of pyroxenes and olivines during weathering The Chemistry of Weathering The Netherlands Reidei, Dordrecht 35 – 53.CrossRefGoogle Scholar
Schott, J., Berner, R. A. and Sjöberg, E. L., 1981 Mechanism of pyroxene and amphibole weathering—I. Experimental studies of iron-free minerals Geochim. Cosmochim. Acta 45 2123 – 2135.CrossRefGoogle Scholar
Smyth, J. R. and Bish, D. L., 1988 Crystal Structures and Cation Sites of the Rock- Forming Minerals Boston Allen & Unwin.Google Scholar
Stoops, G., Altemuller, H.-J. Bisdom, E. B. A. Delvigne, J., Dobrovolsky, V. V., Fitzpatrick, E. A., Paneque, G. and Sleeman, J., 1979 Guidelines for the description of mineral alterations in soil micromorphology Pédologie 29 121 – 135.Google Scholar
Velbel, M. A., 1983 A dissolution-reprecipitation mechanism for the pseudomorphous replacement of plagioclase feldspars by clay minerals during weathering Petrologie des Altérations et des Sols, Vol. 1 71 139 – 147.Google Scholar
Velbel, M. A., 1984 Natural weathering mechanisms of almandine gamet Geology 12 631 – 634.2.0.CO;2>CrossRefGoogle Scholar
Velbel, M. A., 1985 Geochemical mass balances and weathering rates in forested watersheds of the southern Blue Ridge Amer. J. Sci. 285 904 – 930.CrossRefGoogle Scholar
Velbel, M. A. and Drever, J. I., 1985 Hydrogeochemical constraints on mass balances in forested watersheds of the southern Appalachians The Chemistry of Weathering Dordrecht, The Netherlands Reidei 231 – 247.CrossRefGoogle Scholar
Velbel, M.A., Swank, W. T. and Crossley, D. A. Jr., 1988 Weathering and soil forming processes Forest Hydrology and Ecology at Coweeta New York Springer-Verlag 93 – 102.CrossRefGoogle Scholar
Wicks, F. J. and Whittaker, E. J. W. (1977) Serpentine textures and serpentinization: Canad. Mineral. 15, 459–88.Google Scholar
Wicks, F. J., Whittaker, E. J. W. and Zussman, J., 1977 An idealized model for serpentine textures after olivine Canad. Mineral. 15 446 – 458.Google Scholar
Wilson, M. J., 1975 Chemical weathering of some primary rock-forming minerals Soil Sci. 119 349 – 355.CrossRefGoogle Scholar
Wilson, M. J., 1986 Mineral weathering processes in pod-zolic soils on granitic materials and their implications for surface water acidification J. Geol. Soc. London 143 691 – 697.CrossRefGoogle Scholar
Wilson, M. J. and Farmer, V. C., 1970 A study of weathering in a soil derived from a biotite-hornblende rock. II. The weathering of hornblende Clay Miner. 8 435 – 444.CrossRefGoogle Scholar