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Geochemical aspects of the Santonian Chalk of Ramsgate, England, and the origin of the chert and clay minerals

Published online by Cambridge University Press:  05 July 2018

D. A. Spears
D. A. Spears*
Affiliation:
Department of Geology, University of Sheffield, Sheffield S1 3JD
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Summary

The mineralogy and major-element geochemistry of thirty-seven samples from a borehole in the Upper Cretaceous Chalk (Santonian) of Kent has been determined. The mean carbonate content is 97% and the carbonate is a low-Mg calcite (0.42 mol % MgCO3). Most of the silica is deduced to be biogenic chert. The total clay content probably varies through the sequence due to changes in the rate of carbonate sedimentation. The clay composition remains relatively constant with smectite more abundant than illite. The smectite and K-feldspar could be formed from volcanic debris whereas illite and quartz are thought to be detrital.

Type
Research Article
Information
Mineralogical Magazine , Volume 43 , Issue 325 , March 1979 , pp. 159 - 164
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 1979

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References

Biscaye, (P. E.), 1965. Geol. Soc. Amer. Bull. 76, 803-22.10.1130/0016-7606(1965)76[803:MASORD]2.0.CO;2CrossRefGoogle Scholar
Blatt, (H.), Middleton, (G.), and Murray, (R.), 1972. Origin of sedimentary rocks. Prentice Hall.Google Scholar
Burst, (J. F.), 1959. Clays and Clay Minerals. Proc. 6th Nat. Conf. Pergamon, 327-41.Google Scholar
Calvert, (S. E.), 1974. Pelagic sediments on land and under the sea, 273-99; eds. Hsu, (K. J.) and Jenkyns, (H. C.), Spec. Pub. Int. Ass. Sediment, 1.Google Scholar
Curtis, (C. D.) and Spears, (D. A.), 1971. Clays and Clay Min. 19, 219-27.10.1346/CCMN.1971.0190403CrossRefGoogle Scholar
Dunoyer de Segonzac, (G.), Ferrero, (J.), and Kubler, (B.), 1968. Sedimentology. 10, 137-43.10.1111/j.1365-3091.1968.tb01105.xCrossRefGoogle Scholar
Fellows, (P. M.) and Spears, (D. A.), 1978. Clays and Clay Min. 26, 231-6.10.1346/CCMN.1978.0260307CrossRefGoogle Scholar
Griffith, (J. J.), Windom, (H.), and Goldberg, (E. D.), 1968. Deep-Sea Res. 15, 433-59.Google Scholar
Hancock, (J. M.), 1976. Proc. Geol. Ass. 86, 499-535.CrossRefGoogle Scholar
Jeans, (C. V.), 1968. Clay Miner. 7, 311-29.10.1180/claymin.1968.007.3.05CrossRefGoogle Scholar
Jeans, (C. V.) (in press), Yorks. Geol. Soc.Google Scholar
Krauskopf, (K. B.), 1967. Introduction to Geochemistry. McGraw-Hill.Google Scholar
Morgan-Jones, (M.), 1977. Clay Miner. 12, 331-44.10.1180/claymin.1977.012.4.06CrossRefGoogle Scholar
Norrish, (K.) and Hutton, (J. T.), 1969. Geochim. Cosmo- chim. Acta 33, 431-53.CrossRefGoogle Scholar
Perry, (E. A.) and Hower, (J.), 1970. Clays and Clay Min. 18, 165-78.10.1346/CCMN.1970.0180306CrossRefGoogle Scholar
Pitman, (J. I.), 1978. Clay Miner. 13, 93-100.CrossRefGoogle Scholar
Pomerol, (B.) and Aubry, (M. P.), 1977. Jour. Sed. Petrol. 47, 1027-35.Google Scholar
Rad, (U. von) and Rosch, (H.), 1974. Pelagic sediments on land and under the sea, 327-47; eds. Hsu, (K. J.) and Jenkyns, (H. C.), Spec. Publ. Int. Ass. Sediment. 1.Google Scholar
Sheppard, (R. A.) and Gude, (A.J.,III.), 1969. U.S. Geol. Surv. Prof. Paper 634.Google Scholar
Smith, (A. G.) and Briden, (J. C.), 1977. Mesozoic and Cenozoic Palaeocontinental Maps. Cambridge Univ. Press.Google Scholar
Stableim, (N. K. III) and Dapples, (E. C.), 1977. Jour. Sed. Petrol. 47, 1512-38.Google Scholar
Weaver, (C. E.), 1959. Clays and Clay Minerals. Proc. 6th Nat. Conf. Pergamon, 154-87.Google Scholar
Weaver, (C. E.) and Pollard, (L. D.), 1973. The chemistry of the clay minerals. Developments in Sedimentology, 15, Elsevier.Google Scholar
Weir, (A. H.) and Catt, (J. A.), 1965. Clay Miner. 6, 97-110.CrossRefGoogle Scholar
Wise, (S. W., jr.) and Weaver, (F. M.), 1974. Pelagic sediments on land and under the sea, 301-26; eds. Hsu, (K. J.) and Jenkyns, (H. C.), Spec. Publ. Int. Ass. Sediment. 1.Google Scholar