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Mixed-Layer Illite/Smectite Minerals in Tertiary Sandstones and Shales, San Joaquin Basin, California

Published online by Cambridge University Press:  02 April 2024

Karl Ramseyer  and
J. R. Boles
Karl Ramseyer
Affiliation:
Department of Geological Sciences, University of California, Santa Barbara, California 93106
J. R. Boles
Affiliation:
Department of Geological Sciences, University of California, Santa Barbara, California 93106
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Abstract

The southern San Joaquin Valley contains more than 7 km of sedimentary fill, largely Miocene and younger in age. Ancient depositional environments ranged from alluvial fans at the basin margins to turbidite fans toward the basin center. Mixed-layer illite/smectite (I/S) dominates the <2-μm fraction of Miocene shales, and kaolinite is abundant in Miocene sandstones. I/S from carbonate-cemented sandstones contains 5–20% more smectite layers than I/S from uncemented sandstones. The timing of cementation correlates with the proportion of smectite layers in the I/S, suggesting that cementation slowed the illitization process. Smectite and I/S with > 80% expandable layers occur at present burial temperatures of 120°-l 40°C in Miocene sandstones and shales. This highly expandable I/S is restricted to areas covered by thick deposits (1000-2500 m) of Pleistocene sediments. Rocks of similar age and at equivalent temperatures, but covered by <900 m of Pleistocene sediments, contain I/S having low expandabilities (<30%).

Microprobe analyses of 16 discrete smectite and smectite-rich I/S clays indicate an average montmorillonite composition of:

$$\left( {C{a_{0.2}}{K_{0.15}}N{a_{0.1}}} \right)\left( {A{l_{3.0}}F{e^{3 + }}_{0.35}M{g_{0.75}}T{i_{0.03}}} \right)\left( {S{i_{7.7}}A{l_{0.3}}} \right){O_{20}}{\left( {OH} \right)_4} \cdot n{H_2}O.$$
Smectite in I/S-rich clays of Gulf Coast shales has a similar composition except for lower octahedral Al/ Fe ratios (Al/FeVI = 3.1), compared with the San Joaquin samples (Al/FeVI = 8.6).

Residence time at different temperatures appears to be an important influence on the percentage of smectite layers in I/S from the San Joaquin basin. Areas containing I/S with high expandabilities (e.g., 95% smectite layers) have a time-temperature index (TTI) of 4.0-4.5 at 120°C, whereas areas containing I/S with low expandabilities (e.g., 30% smectite layers) have a TTI of 5.0. Present data suggest that highly expandable I/S changed to slightly expandable I/S over a narrow temperature interval (10°-20°C). Differences in the potassium availability from detrital components and in the K+/H+ activity ratios of pore water do not appear to be related to the differences in the percentage of smectite layers of these I/S clays.

Keywords

Carbonate cementationIllite/smectiteMicroprobe analysisMixed layerSmectiteTime-temperature index
Type
Research Article
Information
Clays and Clay Minerals , Volume 34 , Issue 2 , April 1986 , pp. 115 - 124
Copyright
Copyright © 1986, The Clay Minerals Society

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References

Aoki, S., Kohyama, N. and Sudo, T., 1974 An iron-rich montmorillonite in a sediment core from the northeastern Pacific Deep Sea Research 21 865–875.Google Scholar
Bartow, A. J. and McDougall, K., 1984 Tertiary stratigraphy of the southeastern San Joaquin Valley, California U.S. Geol. Surv. Bull. 1529–J J1 J41.Google Scholar
Bateman, P. C., Clark, L. D., Huber, N. K., Moore, J. G. and Rinehart, C. D., 1963 The Sierra Nevada batholith U.S. Geol. Surv. Prof. Pap. 414D D1 D46.Google Scholar
Boles, J. R. and Franks, S. G., 1979 Clay diagenesis in Wilcox sandstones of southwest Texas: implications of smectite diagenesis on sandstone cementation J. Sed. Petrol. 49 55–70.Google Scholar
Brigarti, M. F., 1983 Relationships between composition and structure in Ferich smectites Clay Miner. 18 177–186.CrossRefGoogle Scholar
Brigatti, M. F. and Poppi, L., 1981 A mathematical model to distinguish the members of the dioctahedral smectite series Clay Miner. 16 81–89.CrossRefGoogle Scholar
Brindley, G. W. and Brown, G., 1980 Crystal Structures of Clay Minerals and Their X-ray identification London Mineralogical Society Monograph No. 5.CrossRefGoogle Scholar
Bruce, C. H., 1984 Smectite dehydration—its relation to structural development and hydrocarbon accumulation in northern Gulf of Mexico basin Amer. Assoc. Petrol. Geol. Bull. 68 673–683.Google Scholar
Burst, J. F., 1969 Diagenesis of Gulf Coast clayey sediments and its possible relation to petroleum migration Amer. Assoc. Petrol. Geol. Bull. 53 73–93.Google Scholar
Callaway, D. C., 1971 Petroleum potential of San Joaquin basin, California Future Petroleum Provinces of the United States— Their Geology and Potential, I. H. Cram, ed., Amer. Assoc. Petrol. Geol. Memoir 15 239–253.Google Scholar
Deer, W. A., Howie, R. A. and Zussman, J., 1963 Rock Forming Minerals, Volume 3—Sheet Silicates New York Wiley.Google Scholar
Dunoyer de Segonzac, G., 1970 The transformation of clay minerals during diagenesis and low-grade metamorphism: a review Sedimentology 15 281–346.CrossRefGoogle Scholar
Eberl, D., 1978 Reaction series for dioctahedral smectites Clays & Clay Minerals 26 327–340.CrossRefGoogle Scholar
Eberl, D. and Hower, J., 1976 Kinetics of illite formation Geol. Soc. Amer. Bull. 87 1326–1330.2.0.CO;2>CrossRefGoogle Scholar
Eberl, D., Whitney, G. and Khoury, H., 1978 Hydrothermal reactivity of smectite Amer. Mineral. 63 401–409.Google Scholar
Howard, J. J., 1981 Lithium and potassium saturation of illite/smectite clays from interlaminated shales and sandstones Clays & Clay Minerals 29 136–142.CrossRefGoogle Scholar
Hower, J., Eslinger, E., Hower, M. and Perry, E., 1976 Mechanism of burial metamorphism of argillaceous sediments: 1. Mineralogical and chemical evidence Geol. Soc. Amer. Bull. 87 725–737.2.0.CO;2>CrossRefGoogle Scholar
Johns, W. D. and Shimoyama, A., 1972 Clay minerals and petroleum-forming reactions during burial and diagenesis Amer. Assoc. Petrol. Geol. Bull. 56 2160–2167.Google Scholar
Lahann, R. W., 1980 Smectite diagenesis and sandstone cement; the effect of reaction temperature J. Sed. Petrol. 50 755–760.CrossRefGoogle Scholar
Mattigod, S. V. and Sposito, G., 1978 Improved method for estimating the standard free energies of formation (G°f,298.15) of smectites Geochim. Cosmochim. Acta 42 1753–1762.CrossRefGoogle Scholar
Merino, E. and Ransom, B., 1982 Free energies of formation of illite solid solutions and their compositional dependence Clays & Clay Minerals 30 29–39.CrossRefGoogle Scholar
Nemecz, E., 1981 Clay Minerals Budapest Akademiai Kiado.Google Scholar
Perry, E. A. and Hower, J., 1970 Burial diagenesis in Gulf pelitic sediments Clays & Clay Minerals 18 165–177.CrossRefGoogle Scholar
Perry, E. A. and Hower, J., 1972 Late-stage dehydration in deeply buried pelitic sediments Amer. Assoc. Petrol. Geol. Bull. 56 2013–2021.Google Scholar
Peters, T.j. and Hofmann, B., 1984 Hydrothermal clay mineral formation in a biotite-granite in northern Switzerland Clay Miner. 19 579–590.CrossRefGoogle Scholar
Powers, M. C., 1967 Fluid-release mechanisms in compacting marine mudrocks and their importance in oil exploration Amer. Assoc. Petrol. Geol. Bull. 51 1240–1254.Google Scholar
Reynolds, R. C. and Hower, J., 1970 The nature of inter-layering in mixed-layer illite/montmorillonites Clays & Clay Minerals 18 25–36.CrossRefGoogle Scholar
Roberson, H. E. and Lahann, R., 1981 Smectite to illite conversion rates: effects of solution chemistry Clays & Clay Minerals 29 129–135.CrossRefGoogle Scholar
Ross, C. S. and Hendricks, S. B., 1945 Minerals of the montmorillonite group U.S. Geol. Surv. Prof. Pap. 205B 23–79.Google Scholar
Srodon, J., 1980 Precise identification of illite/smectite interstratifications by X-ray powder diffraction Clays & Clay Minerals 28 401–411.CrossRefGoogle Scholar
Tardy, Y. and Garrels, R. M., 1974 A method of estimating the Gibbs energies of formation of layer silicates Geochim. Cosmochim. Acta 38 1101–1116.CrossRefGoogle Scholar
Towe, K. M., 1962 Clay mineral diagenesis as a possible source of silica cement in sedimentary rocks J. Sed. Petrol. 32 26–28.Google Scholar
van Olphen, H. and Fripiat, J. J., 1979 Data Handbook for Clay Minerals and other Non-Metallic Minerals New York Pergamon Press.Google Scholar
Waples, D. W., 1980 Organic Geochemistry for Exploration Geologists Minneapolis Burgess 95–137.Google Scholar
Webb, G. W., 1981 Stevens and earlier Miocene turbidite sandstones, southern San Joaquin Valley, California Amer. Assoc. Petrol. Geol. Bull. 65 438–465.Google Scholar
Woolery, T. J., 1979 Calculation of chemical equilibrium between aqueous solution and minerals: EQ3/6 software package Univ. Calif. Lawrence Livermore Lab UCRL-52658 .CrossRefGoogle Scholar