Tectonic environment of the Devonian Gramscatho Basin, South Cornwall; framework mode and geochemical evidence from turbiditic sandstones

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doi: 10.1144/gsjgs.144.4.0531
Authors:Floyd, P. A.; Leveridge, B. E.
Author Affiliations:Primary:
Univ. Keele, Dep. Geol., Staffordshire, United Kingdom
Other:
Br. Geol. Surv., United Kingdom
Volume Title:Journal of the Geological Society of London
Source:Journal of the Geological Society of London, 144(4), p.531-542. Publisher: Geological Society of London, London, United Kingdom. ISSN: 0016-7649
Publication Date:1987
Note:In English. 78 refs.; illus. incl. 2 tables, geol. sketch map
Summary:The Portscatho formation in the Gramscatho group is a thick sequence of deep-water sandstones and interbedded slates deposited by turbidity currents in the basin. It is petrographically and chemically coherent, though there are more metamorphic clasts, high Cr and low Zr abundances at the top. It appears that the sandstones were derived from a dissected continental magmatic arc, mainly acidic but with some intermediate/basic material. The presence of an arc to the S of Cornwall during the Devonian imples subduction at the margin of the basin, whose closure is related to the northward stacking of flysch-ophiolite nappes. [R.E.S.]
Subjects:Clastic rocks; Devonian; Geochemistry; Paleozoic; Sandstone; Sedimentary petrology; Sedimentary rocks; Tectonics; Turbidite; Cornwall England; England; Europe; Great Britain; United Kingdom; Western Europe; Gramscatho Basin; Gramscatho Group; Portscatho Formation
Abstract Numbers:88M/2299
Record ID:1987072237
Copyright Information:GeoRef, Copyright 2019 American Geosciences Institute. Reference includes data from Mineralogical Abstracts, United Kingdom, Twickenham, United Kingdom
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