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Comparison of the Mineralogical and Chemical Composition of 2 Shales from the Western Canada Sedimentary Basin and the United States Gulf Coast

Published online by Cambridge University Press:  28 February 2024

Patrice de Caritat ,
John Bloch ,
Ian Hutcheon ,
Fred J. Longstaffe  and
Hugh J. Abercrombie
Patrice de Caritat
Affiliation:
Geological Survey of Norway, PO Box 3006-Lade, N-7002 Trondheim, Norway
John Bloch
Affiliation:
Scealu Modus, 2617 Cutler Ave. NE, Albuquerque, New Mexico 87106
Ian Hutcheon
Affiliation:
Department of Geology and Geophysics, The University of Calgary, Calgary, Alberta T2N 1N4, Canada
Fred J. Longstaffe
Affiliation:
Department of Earth Sciences, The University of Western Ontario, London, Ontario N6A 5B7, Canada
Hugh J. Abercrombie*
Affiliation:
Institute of Sedimentary and Petroleum Geology, Geological Survey of Canada, Calgary, Alberta T2L 2A7, Canada
*
†Present address: Birch Mountain Resources Ltd, 3100, 205 5th Avenue SW, Calgary, Alberta T2P 2V7, Canada.
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Abstract

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The mineralogy and geochemistry of shales reflect the composition of the initially deposited precursor mud, subsequently modified by diagenetic processes. To see if significant geochemical differences exist between shales that mainly owe their present-day composition to either deposition or diagenesis, we compare the published mineralogical, bulk and clay-fraction geochemical, and clay-fraction O-isotopic compositions of 2 shales. One shale is from the Western Canada Sedimentary Basin (WCSB), and its composition mainly reflects primary (depositional) chemical and mineralogical variations (smectitic to illitic illite/smectite) within this unit. The other shale is from the United States Gulf Coast (USGC), and its composition mainly reflects mixed-layer illite/smectite (I/S) diagenesis of deposited smectitic clay material. The chemical and mineralogical trends of WCSB and USGC shales, including one of increasing illite content in I/S with depth or maturity, are essentially indistinguishable, in both bulk shale and clay fraction, despite the contrasting genetic interpretations for the origin of the contained I/S. Thus, similar mineralogical and chemical trends with depth or temperature can result either from inherited depositional compositional heterogeneity of the sediment, from burial metamorphism of shale or a combination of both. Interestingly, the O-isotopic compositions of the clay fractions from the WCSB and USGC are significantly different, a fact that reflects original clay formation from source material and water of quite different isotopic compositions. The discrimination between depositional and diagenetic contributions to shale composition continues to pose challenges, but a combination of bentonite, illite polytype, clay isotopic and trace and rare earth elemental analyses together with illite age analysis holds promise for future work.

Keywords

DepositionDiagenesisGeochemistryMineralogyMixed-Layer Illite/SmectiteOxygen Isotopes
Type
Research Article
Information
Clays and Clay Minerals , Volume 45 , Issue 3 , June 1997 , pp. 327 - 332
Copyright
Copyright © 1997, The Clay Minerals Society

References

Abercrombie, H.J. Hutcheon, I.E. Bloch, J.D. and de Caritat, P., (1994) Silica activity and the smectite-illite reaction Geology 22 22–542 10.1130/0091-7613(1994)022<0539:SAATSI>2.3.CO;2.2.3.CO;2>CrossRefGoogle Scholar
Ahn, J.H. and Peacor, D.R., (1986) Transmission and analytical electron microscopy of the smectite-to-illite transition Clays Clay Miner 34 34–179.Google Scholar
Awwiller, D.N., (1993) Mite/smectite formation and potassium mass transfer during burial diagenesis of mudrocks: A study from the Texas Gulf Coast Paleocene-Eocene J Sed Petrol 63 63–512.Google Scholar
Awwiller, D.N., (1994) Geochronology and mass transfer in Gulf Coast mudrocks (south-central Texas, U.S.A.): Rb-Sr, Sm-Nd and REE systematics Chem Geol 116 61–84 10.1016/0009-2541(94)90158-9.CrossRefGoogle Scholar
Bloch, J. Schröder-Adams, C. Leckie, D.A. McIntyre, D.J. Craig, J. and Staniland, M., (1993) Revised stratigraphy of the lower Colorado Group (Albian to Turonian), western Canada Bull Cana Petrol Geol 41 325–348.Google Scholar
Burst, J.F., (1959) Post-diagenetic clay mineral environmental relationships in the Gulf Coast Eocene Clays Clay Miner 6 6–341.Google Scholar
Burst, J.F., (1969) Diagenesis of Gulf Coast clayey sediments and its possible relation to petroleum migration Am Assoc Petrol Geol Bull 53 53–93.Google Scholar
Burst, J.F., (1976) Argillaceous sediment dewatering Ann Rev Earth Planet Sci 4 4–318 10.1146/annurev.ea.04.050176.001453.CrossRefGoogle Scholar
de Caritat, P. Bloch, J. and Hutcheon, I., (1994) LPNORM: A linear programming normative analysis code Comput Geosci 20 20–347 10.1016/0098-3004(94)90045-0.CrossRefGoogle Scholar
de Caritat, P. Bloch, J. Hutcheon, I. and Longstaffe, F.J., (1994) Compositional trends of a Cretaceous foreland basin shale (Belle Fourche Formation, Western Canada Sedimentary Basin): Diagenetic and depositional controls Clay Miner 29 503–526 10.1180/claymin.1994.029.4.09.CrossRefGoogle Scholar
Craig, H., (1961) Standards for reporting concentrations of deuterium and oxygen-18 in natural waters Science 133 133–1834.CrossRefGoogle ScholarPubMed
Cullers, R.L., (1994) The controls on the major and trace element variation of shales, siltstones, and sandstones of Penn-sylvanian-Permian age from uplifted continental blocks in Colorado to platform sediment in Kansas, USA Geochim Cosmochim Acta 58 4955–4972 10.1016/0016-7037(94)90224-0.CrossRefGoogle Scholar
Culotta, R. Latham, T. Sydow, M. Oliver, J. Brown, L. and Kaufman, S., (1992) Deep structure of the Texas Gulf passive margin and its Ouachita-Precambrian basement; results of the CO-CORP San Marcos Arch survey Am Assoc Petrol Geol Bull 76 76–283.Google Scholar
Eberl, D.D., (1993) Three zones for illite formation during burial diagenesis and metamorphism Clays Clay Miner 41 41 37 10.1346/CCMN.1993.0410103.CrossRefGoogle Scholar
Fagel, N. Andre, L. and Debrabant, P., (1994) Geochemical tools useful in order to discriminate the distinct sedimentary components of deep-sea clays (Neogene Equatorial Indian Ocean) Mineral Mag 58A 259–260 10.1180/minmag.1994.58A.1.136.CrossRefGoogle Scholar
Freed, R.L. and Peacor, D.R., (1992) Diagenesis and the formation of authigenic illite-rich I/S crystals in Gulf Coast shales: TEM study of clay separates J Sed Petrol 62 62–234.Google Scholar
Hoffman, J. and Hower, J., (1979) Clay mineral assemblages as low grade metamorphic geothermometers: Application to the thrust faulted disturbed belt of Montana, U.S.A Soc Econ Paleontol Mineral Spec Publ 26 55–79.Google Scholar
Hower, J. Eslinger, E.V. Hower, M.E. and Perry, E.A., (1976) Mechanism of burial metamorphism of argillaceous sediments: 1 Mineralogical and chemical evidence. Geol Soc Am Bull 87 87–737.Google Scholar
Hower, J. and Mowatt, T.C., (1966) The mineralogy of illites and mixed-layer illite/montmorillonites Am Mineral 51 51–854.Google Scholar
Lindgreen, H. Jacobsen, H. and Jakobsen, H.J., (1991) Diagenetic structural transformations in North Sea Jurassic illite/smectite Clays Clay Miner 39 39–69 10.1346/CCMN.1991.0390108.CrossRefGoogle Scholar
Moore, D.M. and Reynolds, R.C., (1989) X-ray diffraction and the identification and analysis of clay minerals New York Oxford Univ Pr..Google Scholar
Mossmann, J.R., (1991) K-Ar dating of authigenic illite-smectite clay material: Application to complex mixtures of mixed-layer assemblages Clay Miner 26 189–198 10.1180/claymin.1991.026.2.04.CrossRefGoogle Scholar
Ohr, M. Halliday, A.N. and Peacor, D.R., (1994) Mobility and fractionation of rare earth elements in argillaceous sediments: Implications for dating diagenesis and low-grade metamorphism Geochim Cosmochim Acta 58 58–312 10.1016/0016-7037(94)90465-0.CrossRefGoogle Scholar
Perry, E.A. and Hower, J., (1970) Burial diagenesis in Gulf Coast pelitic sediments Clays Clay Miner 18 18–177 10.1346/CCMN.1970.0180306.CrossRefGoogle Scholar
Pollastro, R.M., (1994) Clay diagenesis and mass balance—The forest and the trees Clays Clay Miner 42 42–97 10.1346/CCMN.1994.0420112.CrossRefGoogle Scholar
Powers, M.C., (1967) Fluid-release mechanisms in compacting marine mudrocks and their importance in oil exploration Am Assoc Petrol Geol Bull 51 51–1254.Google Scholar
Pye, K. Krinsley, D.H. and Burton, J.H., (1986) Diagenesis of US Gulf Coast shales Nature 324 324–559 10.1038/324557a0.CrossRefGoogle ScholarPubMed
Roden, M.K. Elliott, W.C. Aronson, J.L. and Miller, D.S., (1993) A comparison of fission-track ages of apatite and zircon to the K/Ar ages of illite-smectite (I/S) from Ordovician K-bentonites, southern Appalachian basin J Geol 101 633–641 10.1086/648254.CrossRefGoogle Scholar
Schroeder, P.A., (1993) A chemical, XRD, and 27Al MAS NMR investigation of Miocene Gulf Coast shales with applications to understanding illite/smectite crystal-chemistry Clays Clay Miner 41 668–679 10.1346/CCMN.1993.0410605.CrossRefGoogle Scholar
Velde, B. and Hower, J., (1963) Petrographical significance of illite polymorphism in Paleozoic sedimentary rocks Am Mineral 48 48–1254.Google Scholar
Yau, Y.C. Peacor, D.R. and McDowell, S.D., (1987) Smectite-to-illite reactions in Salton Sea shales: A transmission and analytical electron microscopy study J Sed Petrol 57 57–342.Google Scholar
Yeh, H.W. and Savin, S.M., (1977) Mechanism of burial metamorphism of argillaceous sediments: 3. O-isotope evidence Geol Soc Am Bull 88 88–1330 10.1130/0016-7606(1977)88<1321:MOBMOA>2.0.CO;2.2.0.CO;2>CrossRefGoogle Scholar