REFERENCES
387
they contain nodular anhydrite (replaced by gypsum near the surface) and salt pseudomorphs (see Fig. 5.34). The Purbeck Beds are interpreted as sabkha deposits laid down
in hypersaline and brackish lagoons. Locally the Purbeck Beds contain a spectacular
evaporite collapse breccia, termed the "Broken Beds." These only occur in the rollover
zone of a major growth fault. They are locally contorted into folds that are overturned
toward the fault plane (Fig. 8.44). It appears that, not only may the extent of the sabkha
have been restricted by the rollover hollow, but also that the northerly paleoslope may
have controlled the movement of this solution collapse breccia (Selley and Stoneley,
1987).
SELECTED BIBLIOGRAPHY
Generak
Giles, M. R. (1997). "Diagenesis: A Quantitative Perspective." Kluwer Academic Press, Dordrecht, The Netherlands. 526pp.
For clays see:
Schieber, J., Zimmerle, W., and Selhi, E S., eds. (1998). "Shales and Mudstones I: Basin Studies,
Sedimentology and Palaeontology." E. Schweizerrbart'sche Verlagsbuchhandlung, Stuttgart.
875pp.
Schieber, J., Zimmerle, W., and Selhi, E S., eds. (1998). "Shales and Mudstones II: Basin Studies,
Petrography, Petrophysics, Geochemistry, and Economic Geology." E. Schweizerrbart'sche
Verlagsbuchhandlung, Stuttgart. 753pp.
For volcaniclastic sediments see:
Orton, G. J. (1996). Volcanic environments. In "Sedimentary Environments: Processes, Facies
and Stratigraphy" (H. G. Reading, ed.), 3rd ed., pp. 486-567. Blackwell, Oxford.
For sandstones see:
Morse, D. G. (1994). Siliciclastic reservoir Rocks. Mem.--Am. Assoc. Pet. Geol. 60, 121-139.
For conglomerates and breccias see:
Koster, E. H., and Steel, R. J., eds. (1984). "Sedimentology of Gravels and Conglomerates,"
Mem. No. 10. Can. Soc. Pet. Geol. Calgary.
Reimold, W. V. (1997). Exogenic and endogenic breccias: A discussion of major problematics.
Earth Sci. Rev. 43, 25-47.
REFERENCES
Addis, M. A., and Jones, M. E. (1986). Volume changes during diagenesis. Mar. Pet. Geol. 2,
241-246.
A1-Gailani, M. B. (1981). Authigenic mineralization at unconformities: Implications for reservoir
characteristics. Sediment. Geol. 29, 89-115.
Allen, J. R. L. (1986). Time scales of colour change in late Flandrian intertidal muddy sediments
of the Severn Estuary. Proc. Geol. Assoc. 97, 23-28.
387
they contain nodular anhydrite (replaced by gypsum near the surface) and salt pseudomorphs (see Fig. 5.34). The Purbeck Beds are interpreted as sabkha deposits laid down
in hypersaline and brackish lagoons. Locally the Purbeck Beds contain a spectacular
evaporite collapse breccia, termed the "Broken Beds." These only occur in the rollover
zone of a major growth fault. They are locally contorted into folds that are overturned
toward the fault plane (Fig. 8.44). It appears that, not only may the extent of the sabkha
have been restricted by the rollover hollow, but also that the northerly paleoslope may
have controlled the movement of this solution collapse breccia (Selley and Stoneley,
1987).
SELECTED BIBLIOGRAPHY
Generak
Giles, M. R. (1997). "Diagenesis: A Quantitative Perspective." Kluwer Academic Press, Dordrecht, The Netherlands. 526pp.
For clays see:
Schieber, J., Zimmerle, W., and Selhi, E S., eds. (1998). "Shales and Mudstones I: Basin Studies,
Sedimentology and Palaeontology." E. Schweizerrbart'sche Verlagsbuchhandlung, Stuttgart.
875pp.
Schieber, J., Zimmerle, W., and Selhi, E S., eds. (1998). "Shales and Mudstones II: Basin Studies,
Petrography, Petrophysics, Geochemistry, and Economic Geology." E. Schweizerrbart'sche
Verlagsbuchhandlung, Stuttgart. 753pp.
For volcaniclastic sediments see:
Orton, G. J. (1996). Volcanic environments. In "Sedimentary Environments: Processes, Facies
and Stratigraphy" (H. G. Reading, ed.), 3rd ed., pp. 486-567. Blackwell, Oxford.
For sandstones see:
Morse, D. G. (1994). Siliciclastic reservoir Rocks. Mem.--Am. Assoc. Pet. Geol. 60, 121-139.
For conglomerates and breccias see:
Koster, E. H., and Steel, R. J., eds. (1984). "Sedimentology of Gravels and Conglomerates,"
Mem. No. 10. Can. Soc. Pet. Geol. Calgary.
Reimold, W. V. (1997). Exogenic and endogenic breccias: A discussion of major problematics.
Earth Sci. Rev. 43, 25-47.
REFERENCES
Addis, M. A., and Jones, M. E. (1986). Volume changes during diagenesis. Mar. Pet. Geol. 2,
241-246.
A1-Gailani, M. B. (1981). Authigenic mineralization at unconformities: Implications for reservoir
characteristics. Sediment. Geol. 29, 89-115.
Allen, J. R. L. (1986). Time scales of colour change in late Flandrian intertidal muddy sediments
of the Severn Estuary. Proc. Geol. Assoc. 97, 23-28.