Geochemical discrimination of Silurian mudstones according to depositional process and provenance within the southern Welsh Basin

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Authors:Ball, T. K.; Davies, J. R.; Waters, R. A.; Zalasiewicz, J. A.
Author Affiliations:Primary:
British Geological Survey, Keyworth, United Kingdom
Other:
British Geological Survey, United Kingdom
Volume Title:Special issue on the Palaeozoic Welsh Basin
Volume Authors:Woodcock, N. H., editor; Fletcher, C. J. N.
Source:Geological Magazine, 129(5), p.567-572; Review meeting on the Welsh Basin, Aberystwyth, United Kingdom, Nov. 15-18, 1991, edited by N. H. Woodcock and C. J. N. Fletcher. Publisher: Cambridge University Press, London, United Kingdom. ISSN: 0016-7568
Publication Date:1992
Note:In English. 23 refs.; illus., incl. 2 tables, geol. sketch map
Summary:Distinct geochemical differences, which reflect differences in depositional environment, process and provenance, are present in these Llandovery mudstones. Turbidite mudstones show higher concentrations of Fe2O3, MgO, TiO2, MnO, LOI, Zn and Zr than laminated hemipelagites. This is consistent with the observed higher concentrations of chlorite and Ti-bearing minerals in turbidite mudstones. Laminated hemipelagites show higher values of REE (Ce and La), concentrated within authigenic monazites, and Ni, As, Cu and Pb within sulphide minerals (pyrite and galena) reflecting the influence of primary organic carbon levels and anoxic bottom waters on early diagenesis. [C.H.D.]
Subjects:Chemical composition; Clastic rocks; Deposition; Depositional environment; Geochemistry; Lithogeochemistry; Llandovery; Lower Silurian; Metals; Mudstone; Paleozoic; Provenance; Rare earths; Sedimentary rocks; Silurian; Turbidite; Europe; Great Britain; United Kingdom; Wales; Welsh Basin; Western Europe
Coordinates:N513000 N533000 W0024000 W0051500
Abstract Numbers:93M/3105
Record ID:1996005470
Copyright Information:GeoRef, Copyright 2019 American Geosciences Institute. Reference includes data from Mineralogical Abstracts, United Kingdom, Twickenham, United Kingdom
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