Fe-rich deposits associated with Ordovician basalts in the Southern Uplands of Scotland; possible lower Palaeozoic equivalents of modern active ridge sediments

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doi: 10.1016/0012-821X(80)90031-X
Authors:Leggett, J. K.; Smith, T. K.
Volume Title:Earth and Planetary Science Letters
Source:Earth and Planetary Science Letters, 47(3), p.431-440. Publisher: Elsevier, Amsterdam, Netherlands. ISSN: 0012-821X
Publication Date:1980
Note:In English. 36 refs.; illus. incl. tables, geol. sketch map
Summary:Ferruginous mudstones and cherts occur in association with Ordovician basalts at the base of the pelagic sequence in the Southern Uplands of Scotland, an area which has recently been interpreted as a Lower Palaeozoic accretionary trench/fore-arc complex. Intimate contacts between the Fe-rich deposits and the basalts indicate contemporaneity between ocean-floor volcanism and metalliferous mud accumulation. This, together with a Ce-depleted RE analysis from a supra-basaltic sample, and impoverishment of the sediments in Al and Ti relative to normal pelagic clays, suggests a hydrothermal-exhalative origin for the deposits, analogous to that of metalliferous sediments from modern ocean basins and Mesozoic ophiolites. XRF analyses of metals in 14 sediments are presented, with RE abundances in three samples. The Southern Uplands Fe-rich deposits are compared with oceanic/ophiolitic sediments from five other localities. [P.Br.]
Subjects:Basalts; Chemically precipitated rocks; Chert; Clastic rocks; Data; Exhalative processes; Genesis; Geochemistry; Hydrothermal alteration; Igneous rocks; Iron-rich composition; Lower Ordovician; Major elements; Metallogeny; Metals; Metasomatism; Mudstone; Ordovician; Paleozoic; Rare earths; Sea-floor spreading; Sedimentary rocks; Trace elements; Volcanic rocks; Europe; Great Britain; Scotland; Southern Uplands; United Kingdom; Western Europe; Abundance; Hydrothermal processes
Coordinates:N540000 N560000 W0020000 W0052000
Abstract Numbers:82M/4386
Record ID:1980054599
Copyright Information:GeoRef, Copyright 2019 American Geosciences Institute. Reference includes data from Mineralogical Abstracts, United Kingdom, Twickenham, United Kingdom
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