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Absence of Clay Diagenesis in Cretaceous-Tertiary Marine Shales, Campos Basin, Brazil

Published online by Cambridge University Press:  02 April 2024

Sylvia Maria Couto Anjos
Sylvia Maria Couto Anjos*
Affiliation:
Petroleo Brasileiro S.A., Rio de Janeiro, Brazil Department of Geology, University of Illinois, Urbana, Illinois 61801
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Abstract

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In Upper Cretaceous-Tertiary marine shales (Campos Formation) from the Campos basin, Brazil, mixed-layer illite/smectite (I/S) has remained randomly interstratified to depths of 3500 m and to temperatures as high as 100°C, in contrast to the typical pattern of shale diagenesis in, for example, the Gulf Coast area. X-ray powder diffraction analysis of the bulk shale and several size fractions from samples from one well in the Brazilian basin and from one in the Gulf Coast region were carried out to assess the factors that might have controlled the lack of illitization in the Campos Formation shales.

In samples from the Gulf Coast well, the clay minerals are I/S (montmorillonite-type), discrete illite, chlorite, and minor kaolinite. In contrast, the clay minerals in samples from the Campos basin well are kaolinite, clay-size biotite, and I/S (nontronite-type). Kaolinite is abundant in this well, and the variation of its abundance with depth seems to reflect variations in sea-level stands. The original composition of the I/S (nontronite-type) was probably the main factor controlling the lack of illitization in the shales of the Campos Formation.

Keywords

DiagenesisIlliteInterstratifiedNontroniteShaleSmectiteX-ray powder diffraction
Type
Research Article
Information
Clays and Clay Minerals , Volume 34 , Issue 4 , August 1986 , pp. 424 - 434
Copyright
Copyright © 1986, The Clay Minerals Society

References

Anjos, S. C., 1984 Diagenetic evolution of marine shales (Late Cretaceous/Tertiary) of the Campos basin, Brazil Urbana, Illinois University of Illinois.Google Scholar
Blatter, C. L., 1974 The interaction of clay minerals with distilled water and saline solutions at elevated temperatures Binghamton, New York State University of New York.Google Scholar
Bruce, C. H., 1984 Smectite dehydration—its relation to structural development and hydrocarbon accumulations in northern Gulf of Mexico basin Amer. Assoc. Petrol. Geol. Bull. 68 673–683.Google Scholar
Burst, J. F. and Swineford, A., 1959 Post-diagenetic clay mineral environmental relationships in the Gulf Coast Eocene Clays and Clay Minerals, Proc. 6th Natl. Conf., Berkeley, California, 1957 New York Pergamon Press 327–341.Google Scholar
Burst, J. F., 1969 Diagenesis of Gulf Coast clay sediments and its possible relation to petroleum migration Amer. Assoc. Petrol. Geol. Bull. 53 73–79.Google Scholar
Chang, H. K., 1983 Diagenesis and mass transfer in Cretaceous sandstone-shales sequences, offshore Brazil Evanston, Illinois Northwestern University.Google Scholar
Čičel, B. and Machajdik, D., 1981 Potassium- and ammonium-treated montmorillonites. I. Interstratified structures with ethylene glycol and water Clays & Clay Minerals 29 40–46.CrossRefGoogle Scholar
da Rocha, J., Milliman, J. D., Santana, C. I. and Vicalvi, M. A., 1975 Upper continental margins sedimentation off Brazil: Part V. Southern Brazil Cont. Sediment. 4 117–150.Google Scholar
Eberl, D., Whitney, G. and Khoury, H., 1978 Hydrothermal reactivity of smectite Amer. Mineral. 63 401–405.Google Scholar
Foscolos, A. E. and Kodama, H., 1974 Diagenesis of clay minerals from Lower Cretaceous shales of northeastern British Columbia Clays & Clay Minerals 22 319–335.CrossRefGoogle Scholar
Foster, W. R. and Custard, H. C. (1982) Role of clay composition on extent of smectite/illite diagenesis: Amer. Assoc. Petrol. Geol. 66, 1444 (abstract).Google Scholar
Guazelli, W. and Carvalho, J. C., 1981 Estruturas da margem continetal leste brasileira e das areas oceânicas e continetais adjacentes Projeto REMAC, CENPES-PETRO-BRAS 9 117–143.Google Scholar
Hoffman, J., 1976 Regional metamorphism and K-Ar dating of clay minerals in Cretaceous sediments of the disturbed belt of Montana Cleveland, Ohio Case Western Reserve University.Google Scholar
Hower, J., Eslinger, E. V., Hower, M. E., Perry, E. A. Jr., 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
Jackson, M. L., 1974 Soil Chemical Analysis—Advanced Course Madison, Wisconsin Department of Soil Science, University of Wisconsin.Google Scholar
Jennings, S. and Thompson, G.R., 1986 Diagenesis in Plio-Pleistocene sediments in the Colorado River delta, southern California J. Sed. Petr. 56 89–98.Google Scholar
Johns, W. D., van Olphen, H. and Veniale, F., 1982 The role of the clay mineral matrix in petroleum generation during burial diagenesis Proc. Int. Clay Conf., Bologna, Pavia, 1981 655–664.Google Scholar
McCubbin, D. G. and Patton, J. W., 1981 Burial diagenesis of illite/smectite, a kinetic model Amer. Assoc. Petrol. Geol. 65 956.Google Scholar
Nadeau, P. H., Reynolds, R. C. Jr., 1981 Volcanic components in pelitic sediments Nature 294 72–74.CrossRefGoogle Scholar
Perry, E. A. and Hower, J., 1970 Burial diagenesis in Gulf Coast pelitic sediments Clays & Clay Minerals 18 165–178.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
Plumley, W. S., 1980 Abnormal high fluid pressure. Survey of some basic principles Amer. Assoc. Petrol. Geol. Bull. 64 414–430.Google Scholar
Ponte, F. C. and Asmus, H. E., 1978 Geological framework of the Brazilian continental margin Geol. Rund. 68 201–235.CrossRefGoogle Scholar
Powers, M. C., 1967 Fluid-release mechanism in compacting marine mudrocks and their importance in oil exploration Amer. Assoc. Petrol. Geol. Bull. 51 1240–1254.Google Scholar
Reynolds, R. C. Jr. and Hower, J., 1970 The nature of interlayering in mixed-layer illite-montmorillonite Clays & Clay Minerals 18 25–36.CrossRefGoogle Scholar
Sherman, G. D., Hauyoshi, I., Vehara, G. and Okazaki, E., 1962 Types of occurrence of nontronite and nontronite-like materials in soils Pacific Science 16 57–62.Google Scholar
Vail, P. R., Mitchum, R. M. Jr. and Thompson, S., 1977 Seismic stratigraphy and global changes of sea level. Part IV. Global cycles of relative changes of sea level Seismic Stratigraphy 26 83–97.Google Scholar
Weaver, C. E., 1961 Clay mineralogy of the Late Cretaceous rocks of the Washakie basin Wyoming Geol. Assoc. Guidebook, 16th Ann. Field Conf. 148–154.Google Scholar