REFERENCES
459
der Borch, 1965). Some ancient cherts are also undoubtedly penecontemporaneous
with sedimentation, as, for example, the synsedimentary chert breccias and dykes described by Harris (1958), Steinitz (1970), and Carozzi and Gerber (1978). It has been
argued that flint formed some 5-10 m below the sediment/water interface where porosity was still in the region of 75-80%. Anaerobic bacterial sulfate reduction released
H2S, reduced pH, and caused the dissolution of chalk and the concomitant precipitation of silica (Clayton, 1986). In other instances, however, the presence of chert in fractures and of chert-replaced carbonate skeletal debris provide conclusive evidence of a
secondary origin. Clearly cherts are polygenetic.
SELECTED BIBLIOGRAPHY
For carbonates in general see:
Jordan, C. E, and Wilson, J. L. (1994). Carbonate reservoir Rocks. Mem.--Am. Assoc. Pet. Geol.
60, 141-158.
Lucia, E J. (1999). "Carbonate Reservoir Characterization." Springer-Verlag, Berlin. 226pp.
Tucker, M. E., and Wright, V. P. (1990). "Carbonate Sedimentology." Blackwell Science, Oxford.
496pp.
For dolomites see:
Purser, B. H., Tucker, M. E., and Zenger, D. H., eds. (1994). "Dolomites." Blackwell, Oxford.
464pp.
For sedimentary ironstones see:
Young, T. P., and Taylor, W. E. G., eds. (1989). "Phanerozoic Ironstones," Spec. Publ. No. 46.
Geol. Soc. London, London. 251pp.
For phosphates see:
Follini, K. B. (1996). The phosphorous cycle, phosphogenesis and marine phosphate-rich deposits. Earth Sci. Rev. 40, 55-124.
For coal see:
Gayer, R., and Harris, I., eds. (1996). "Coalbed Methane and Coal Geology," Spec. Publ. No. 107.
Geol. Soc. London, London. 344pp.
For evaporites see:
Melvin, J. L., ed. (1991). "Evaporites, Petroleum and Mineral Resources." Elsevier, Amsterdam.
556pp.
For cherts see:
Sieveking, G. de G., and Hart, M. B., eds. (1986). "The Scientific Study of Flint and Chert." Cambridge University Press, Cambridge, UK. 290pp.
REFERENCES
Adachi, M., Yamamoto, K., and Sugisaki, R. (1986). Hydrothermal chert and associated siliceous
rocks from the northern Pacific. Sediment. Geol. 47, 125-148.
Ager, D. V. (1993). "The Nature of the Stratigraphical Record," 3rd ed. Wiley, Chichester. 151pp.
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