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Crystal-Size Distributions of Clays During Episodic Diagenesis: The Salton Sea Geothermal System

Published online by Cambridge University Press:  01 January 2024

Jin-wook Kim  and
Donald R. Peacor
Jin-wook Kim*
Affiliation:
Naval Research Laboratory, Code 7431, Stennis Space Center, Mississippi 39529, USA
Donald R. Peacor
Affiliation:
Department of Geological Sciences, The University of Michigan, Ann Arbor, Michigan 48109, USA
*
*E-mail address of corresponding author: [email protected]
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Abstract

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Crystal-size distributions (CSDs) for clay minerals with depth were measured from the Salton Sea Geothermal Field (SSGF) as a test for the presence and meaning of theoretical crystal-size distributions in a natural system. The SSGF is a classic open hydrothermal system, and crystals are forming directly without apparent modification of early-formed crystals, over a wide range of temperature. Thus, the measured CSDs are the actual distributions for a single episode in which all crystals grew at the same time from solution at different temperatures and depths, rather than through modifications of shallower samples.

Some TEM images of ion-milled samples from a range of depths were used to measure the crystal thicknesses of illite, chlorite and biotite. Grain-size histograms flatten, broaden and shift to larger sizes with increasing depth. Values of α and β were calculated and used to verify that the measured distributions are log normal. Reduced grain-size distributions for illite in SSGF samples obey steady-state constraints.

The observations appear to be consistent with evolution of illite with increasing depth in the SSGF system by growth in an open system giving rise to log-normal distributions, followed by supply-controlled growth in an open system. Because crystals at different depths grew simultaneously under different temperature and fluid conditions as a function of depth, they do not represent different stages of a single evolving system. The relations imply that isochemical and isothermal systems which permit an evolving system to be sampled are rare or non-existent. The data for distributions for a given depth in the SSGF are consistent with growth in an open system. The collective relations therefore imply that caution should be used in interpreting conditions of crystal growth in natural systems even where CSDs give results which are necessary for, but not sufficient to prove, a given modeled mechanism.

Keywords

Closed SystemEpisodic DiagenesisIlliteLog-normal DistributionOpen SystemOstwald RipeningTEM
Type
Research Article
Information
Clays and Clay Minerals , Volume 50 , Issue 3 , June 2002 , pp. 371 - 380
Copyright
Copyright © 2002, The Clay Minerals Society

References

Árkai, P. Merriman, R.J. Roberts, B. Peacor, D.R. and Toth, M.N., (1996) Crystallinity, crystallite size and lattice strain of illite-muscovite and chlorite: comparison of XRD and HRTEM data for diagenetic to epizonal pelites European Journal of Mineralogy 8 1119–1137 10.1127/ejm/8/5/1119.CrossRefGoogle Scholar
Baronnet, A., (1982) Ostwald ripening in solution. The case of calcite and mica Estudios Geologie 38 185 198.Google Scholar
Davis, J.C., (1973) Statistics and Data Analysis in Geology New York John Wiley & Sons, Inc. 550 pp.Google Scholar
Donaghe, L.L. and Peacor, D.R., (1987) Textural and mineralogic transitions in SSSDP argillaceous sediments EOS, Transactions of the American Geophysical Union 68 454 Abstract.Google Scholar
Eberl, D.D. and Środoń, J., (1988) Ostwald ripening and interparticle-diffraction effects for illite crystals American Mineralogist 73 1335 1345.Google Scholar
Eberl, D.D. Srodon, J. Kralik, M. Taylor, B.E. and Peterman, Z.E., (1990) Ostwald ripening of clays and metamorphic minerals Science 248 474–477 10.1126/science.248.4954.474.CrossRefGoogle Scholar
Eberl, D.D. Drits, V.A. and Środoń, J., (1998) Deducing growth mechanism for minerals from the shapes of crystal size distribution American Journal of Science 298 499–533 10.2475/ajs.298.6.499.CrossRefGoogle Scholar
Giorgetti, G. Mata, M.P. and Peacor, D.R., (2001) TEM study of the mechanism of transformation of detrital kaolinite and muscovite to illite/smectite in sediments of the Salton Sea Geothermal Field European Journal of Mineralogy 12 923–934 10.1127/ejm/12/5/0923.CrossRefGoogle Scholar
Helgeson, H.C., (1968) Geologic and thermodynamic characteristics of the Salton Sea Geothermal System American Journal of Science 266 129–166 10.2475/ajs.266.3.129.CrossRefGoogle Scholar
Hower, J. Eslinger, E.V. Hower, M. and Perry, E.A., (1976) Mechanism of burial metamorphism of argillaceous sediment: 1. Mineralogical and chemical evidence Geological Society of America Bulletin 87 725–737 10.1130/0016-7606(1976)87<725:MOBMOA>2.0.CO;2.2.0.CO;2>CrossRefGoogle Scholar
Inoue, A. Velde, B. Meunier, A. and Touchard, G., (1988) Mechanism of illite formation during smectite-to-illite convers ion in a hydrothermal system American Mineralogist 73 1325 1334.Google Scholar
Jahren, J.S., (1991) Evidence of Ostwald ripening related recrystallization of diagenetic chlorites from reservoir rocks offshore Norway Clay Minerals 26 169–178 10.1180/claymin.1991.026.2.02.CrossRefGoogle Scholar
Krumbein, W.C. and Graybill, F.A., (1965) An Introduction to Statistical Models in Geology New York McGraw-Hill Book Company 475 pp.Google Scholar
Lanson, B. and Champion, D., (1991) The I/S-to illite reaction in the late stage diagenesis American Journal of Science 291 473–506 10.2475/ajs.291.5.473.CrossRefGoogle Scholar
Li, G. Peacor, D.R. Buseck, P.R. and Arkai, P., (1998) Modification of illite-muscovite crystallite-size distribution by sample preparation for powder XRD analysis Canadian Mineralogist 36 1435 1451.Google Scholar
Muffler, L.P.J. and White, D.E., (1969) Active metamorphism of Upper Cenozoic sediments in the Salton Sea geothermal field and Salton trough, southeastern California Geological Society of America Bulletin 80 157–182 10.1130/0016-7606(1969)80[157:AMOUCS]2.0.CO;2.CrossRefGoogle Scholar
Nielsen, A.E., (1964) Kinetics of Precipitation New York Pergamon Press 151 pp.Google Scholar
Ostwald, W., (1900) Uber die vermeintliche Isomerie des roten und gelben Quecksilberroxsyds und die Oberflachenspannung festter Korper Zeitschrift fur Physikalische Chemie, Stoichiometrie und Verwandtschaftslehre 34 495 503.CrossRefGoogle Scholar
Peacor, D.R., (1998) Implication of TEM data for the concept of fundamental particles The Canadian Mineralogist 36 1397 1408.Google Scholar
Tillick, D.A. Peacor, D.R. and Mauk, J.L., (2001) Genesis of dioctahedral phyllosilicates during hydrothermal alteration of volcanic rocks: I. The Golden Cross epithermal ore deposit, New Zealand Clays and Clay Minerals 49 136–140 10.1346/CCMN.2001.0490203.CrossRefGoogle Scholar
Yan, Y. Tillick, D.A. Peacor, D.R. and Simmons, S.F., (2001) Genesis of dioctahedral phyllosilicates during hydrothermal alteration of volcanic rocks: II. The Broadlands-Ohaaki hydrothermal system, New Zealand Clays and Clay Minerals 49 141–155 10.1346/CCMN.2001.0490204.CrossRefGoogle Scholar
Yau, Y.C. Peacor, D.R. and McDowell, S.D., (1987) Smectite-illite reactions in Salton Sea shales Journal of Sedimentary Petrology 57 335 342.Google Scholar
Yau, Y.C. Peacor, D.R. Beane, R.E. and Essene, E.J., (1988) Microstructures, formation mechanisms, and depth-zoning of phyllosilicates in geothermally altered shales, Salton Sea, California Clays and Clay Minerals 36 1–10 10.1346/CCMN.1988.0360101.Google Scholar