Hostname: page-component-848d4c4894-hfldf Total loading time: 0 Render date: 2024-06-09T08:01:32.285Z Has data issue: false hasContentIssue false
  • English
  • Français

The Alteration of Detrital Minerals in the Mesozoic Rocks of Yorkshire

Published online by Cambridge University Press:  01 May 2009

Frank Smithson
Frank Smithson
Affiliation:
Birkbeck College, University of London
Get access Rights & Permissions [Opens in a new window]

Extract

Dr. R. H. Rastall (1932) has described the petrography of the Middle Jurassic sandstones of Eskdale and shown that they possess a remarkably restricted suite of detrital minerals, having for example no garnet or staurolite, but containing much anatase and brookite, both apparently of authigenic origin. The present writer (1934) showed that in other parts of North-East Yorkshire beds of the same age contain relatively rich heavy mineral assemblages. After a more detailed survey the writer was able to show (1939c, Text-fig. 2) that the peculiar restricted assemblage was confined to a belt or elongated oval area—which can be roughly defined as occupying the north-west and northeast quarters of Sheet 43 (Geol. Survey “one-inch” map) and the north-east quarter of Sheet 44—and that as one passed outward from this area one met with increasingly richer assemblages at all horizons in the Middle Jurassic.1 This result, as well as the results of mapping certain other characteristics of the assemblage, led the writer to suggest that this belt, which coincides closely with the Cleveland axis, is a belt along which active decomposition and alteration has occurred in these deposits after they were laid down.

Type
Articles
Information
Geological Magazine , Volume 78 , Issue 2 , April 1941 , pp. 97 - 112
Copyright
Copyright © Cambridge University Press 1941

Access options

Get access to the full version of this content by using one of the access options below. (Log in options will check for institutional or personal access. Content may require purchase if you do not have access.)

References

REFERENCES

Boswell, P. G. H., 1933. On the Mineralogy of Sedimentary Rocks. London.Google Scholar
Edelman, C. H., 1931. Diagenetische Umwandlungserscheinungen an detritischen Pyroxenen und Amphibolen. Fortschr. Min. Kryst. Pet., xvi, 323–4Google Scholar
Edelman, C. H., and Doeglas, D. J., 1934. Über Umwandlungserscheinungen an detritischem Staurolith und anderen Mineralien. Tschermaks Min. u. Pet. Mitt., xlv, 225–234.Google Scholar
Phillips, F. C., 1932. Crystals of Brookite tabular parallel to the Basal Plane. Min. Mag., xxiii, 126–9.Google Scholar
Rastall, R. H., 1932. The Petrography of some Jurassic Sandstones in Eskdale. Proc. yorks. Geol. Soc., xii, 93–9.CrossRefGoogle Scholar
Smithson, F., 1931. The Triassic Sandstones of Yorkshire and Durham. Proc. Geol. Assoc., xlii, 125–156.CrossRefGoogle Scholar
Smithson, F., 1934. The Petrography of Jurassic Sediments in Yorkshire. Proc. Yorks. Geol. Soc., xxii, 188–198.Google Scholar
Smithson, F., 1937. Outgrowths on Zircon in the Middle Jurassic of Yorkshire. Geol. Mag., lxxiv, 281–3.CrossRefGoogle Scholar
Smithson, F., 1939 a. Statistical Methods in Sedimentary Petrology. I. Percentage Composition of Assemblages and their Graphical Study. Geol. Mag., lxxvi, 297–309.CrossRefGoogle Scholar
Smithson, F., 1939 b. Statistical Methods in Sedimentary Petrology. II. Grain-size Measurements and their Graphical Study. Geol. Mag., lxxvi, 348–360.CrossRefGoogle Scholar
Smithson, F., 1939 c. Statistical Methods in Sedimentary Petrology. III. Cartographic Methods. Geol. Mag., lxxvi, 417–427.CrossRefGoogle Scholar