Abstract
The depth distribution of illite/smectite (I/S) compositions was investigated for a well drilled to a depth of 3462 m on Barbados Island, the only subaerial exposure of the Barbados accretionary complex. The classical pattern of increasing percentage of illite interlayers in the mixed-layer clay with increasing burial depth was not observed. Rather, the data describe an irregular, zig-zag trend with depth. This trend is probably the result of reverse faulting in the section. I/S data were also used to infer several kilometers of uplift and subsequent erosion of the section. This study shows that irregular patterns of clay diagenesis with depth can be anticipated for sequences that have undergone complicated tectonism and deformation. Combined with other geologic information, these patterns can help to determine the tectonic history of the sedimentary sequence.
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Aoyagi, K. and Kazama T. (1980) Transformational changes of clay minerals, zeolites and silica minerals during diagenesis: Sedimentology 27, 179–188.
Bender, M. L., Fairbanks, R. G., Taylor, F. W., Matthews, R. T., Goddard, J. G., and Broecker, W. S. (1979) Uranium-series dating of the Pleistocene reef tracts of Barbados, West Indies: Geol. Soc. Amer. Bull. 90, 557–594.
Biscaye, P. E. (1965) Mineralogy and sedimentation of Recent deep-sea clay in the Atlantic Ocean and adjacent seas and oceans: Geol. Soc. Amer. Bull. 76, 803–832.
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. Petrology 49, 55–70.
Burst, J. F., Jr. (1959) Postdiagenetic clay mineral environment relationship in the Gulf Coast Eocene: in Clays and Clay Minerals, Proc. 6th Natl. Conf., Berkeley, California, 1957, Ada Swineford, ed., Pergamon Press, New York, 327–341.
Chang, H. K., Mackenzie, F. T., and Schoonmaker, J. (1986) Comparison between dioctahedral and trioctahedral smectite diagenesis, Brazilian offshore basins: Clays & Clay Minerals 34, 407–423.
Cloos, M. (1984) Landward-dipping reflectors in accretionary wedges: active dewatering conduits?: Geology 12, 519–522.
Dow, W. G. (1982) Kerogen maturity and type by reflected light microscopy applied to petroleum exploration: in How to Assess Maturation and Paleotemperatures, Soc. Econ. Paleontol. Mineral. Short Course No. 7, F. L. Staplin, W. G. Dow, C. W. D. Milner, D. I. O’Connor, S. A. J. Pocock, P. van Gijzel, D. H. Weite, and M. A. Yükler, eds., 133–158.
Dunoyer de Segonzac, G. (1970) The transformation of clay minerals during diagenesis and low grade metamorphism: a review: Sedimentology 15, 281–346.
Freed, R. L. (1979) Shale mineralogy of the No. 1 Pleasant Bayou geothermal test well: a progress report: in Proc. 4th Geopressured-Geothermal Energy Conf., Univ. Texas, Austin, Texas, 1979, vol. 1, 153–165.
Gretener, P. E. (1977) Pore pressure: fundamentals, general ramifications, and implications for structural geology: Amer. Assoc. Petr. Geol. Educ. Course Note Series 4, 131 pp.
Heling, D. (1974) Diagenetic alteration of smectite in argillaceous sediments of Rhine graben (SW Germany): Sedimentology 21, 463–472.
Hoffman, J. (1976) Regional metamorphism and K-Ar dating of clay minerals in Cretaceous sediments of the disturbed belt of Montana: Ph.D. dissertation, Case Western Reserve University, Cleveland, Ohio, 266 pp.
Hoffman, J. and Hower, J. (1979) Clay mineral assemblages as low grade metamorphic geothermometers: application to the thrust faulted disturbed belt of Montana, USA: Soc. Econ. Paleontol. Mineral. Spec. Publ. 26, 55–79.
Hower, J., Eslinger, E., Hower, M. E., and Perry E. A. (1976) Mechanism of burial metamorphism of argillaceous sediments: I—mineralogical and chemical evidences: Geol. Soc. Amer. Bull. 87, 725–737.
Hunt, J. M. (1979) Petroleum Geochemistry and Geology: Freeman, San Francisco: 617 pp.
Larue, D. K., Schoonmaker, J., Torrini, R., Clark, J., Clark, M., and Schneider, R. (1985) Barbados: maturation, source rock potential and burial history within a Cenozoic accretionary complex: Mar. Petr. Geol 2, 96–110.
Larue, D. K. and Speed, R. C. (1984) Structure of accretionary complex of Barbados, II: Bissex Hill: Geol. Soc. Amer. Bull. 95, 1360–1372.
Mann, U. and Fischer, K. (1982) The triangle method; semiquantitative determination of clay minerals: J. Sed. Petrol. 52, 654–657.
Mann, U. and Müller, G. (1979) X-ray mineralogy of Deep Sea Drilling Project legs 51 through 53, western North Atlantic, in T. Donnelly, J. Francheteau, W. Bryan, P. Robinson, M. Flower, M. Salisbury et al., Init. Repts. DSDP, 51, 52, 53, Pt. 2: U.S. Govt. Printing Office, Washington, D.C., 721–729.
Mehra, O. P. and Jackson, M. L. (1960) Iron oxide removal from soils and clays by a dithionite-citrate system buffered with sodium bicarbonate: in Clays and Clay Minerals, Proc. 7th Natl. Conf., Washington, D.C., 1958, Ada Swineford, ed., Pergamon Press, New York, 317–327.
Moore, J. C., Biju-Duval, B. et al. (1982) Offscraping and underthrusting of sediment at the deformation front of the Barbados ridge: Deep Sea Drilling Project leg 78A: Geol. Soc. Amer. Bull. 82, 1065–1077.
Moore, J. C. and Biju-Duval, B. (1984) Tectonic synthesis, Deep Sea Drilling Project leg 78A: structural evolution of offscraped and underthrust sediment, northern Barbados ridge complex: in B. Biju-Duval and J. C. Moore et al., Init. Repts. DSDP, 78A: U.S. Govt. Printing Office, Washington, D.C., 621 pp.
Perry, E. and Hower, J. (1970) Burial diagenesis in Gulf Coast pelitic sediments: Clays & Clay Minerals 18, 165–177.
Reynolds, R. C., Jr. and Hower, J. (1970) The nature of interlayering in mixed-layer illite-montmorillonites: Clays & Clay Minerals 18, 25–36.
Ristvet, B. L. (1978) Reverse weathering reactions within recent nearshore marine sediments, Kaneohe Bay, Oahu: Ph.D. thesis, Northwestern Univ., Evanston, Illinois, 314 pp.
Schoonmaker, J. (1986) Clay mineralogy and diagenesis of sediments from deformation zones in the Barbados accretionary prism (DSDP Leg 78A): in Synthesis of Structural Fabrics of Deep Sea Drilling Project Cores from Forearcs, J. C. Moore, ed., Geol. Soc. Amer. (in press).
Speed, R. C. (1981) Geology of Barbados: implications for an accretionary origin: Oceanologica Acta Suppl. 4, 259–267.
Speed, R. C. (1983) Structure of the accretionary complex of Barbados, I: Chalky Mount: Geol. Soc. Amer. Bull. 94, 92–116.
Speed, R. C. and Larue, D. K. (1982) Barbados: architecture and implications for accretion: J. Geophys. Res. 87, 3633–3643.
Westbrook, G. K. and Smith, M. J. (1983) Long decollements and mud volcanoes: evidence from the Barbados ridge complex for the role of high pore-fluid pressure in the development of an accretionary complex: Geology 11, 279–283.
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Schoonmaker, J., Mackenzie, F.T. & Speed, R.C. Tectonic Implications of Illite/Smectite Diagenesis, Barbados Accretionary Prism. Clays Clay Miner. 34, 465–472 (1986). https://doi.org/10.1346/CCMN.1986.0340413
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DOI: https://doi.org/10.1346/CCMN.1986.0340413