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Regional geochemical patterns in SE Scotland; source lithology, inheritance and glacial overprinting

P. Stone and A. A. McMillan
Regional geochemical patterns in SE Scotland; source lithology, inheritance and glacial overprinting
Scottish Journal of Geology (May 2013) 49 (1): 33-40

Abstract

The Lower Palaeozoic Southern Uplands terrane shows a NE-SW, strike-parallel coincidence of regional geochemical lineaments defined from stream-sediment data, and major lithostratigraphically significant structures. West of Moffat, Silurian strata of the Gala and Hawick groups are divided by geochemical lineaments coincident with the Laurieston Fault. East of Moffat, the geochemical lineaments diverge towards the NE with Gala-type regional geochemistry (high Sr and Ba, low CaO) to the north of the Moffat Valley Fault, whilst Hawick-type regional geochemistry (low Sr and Ba, high CaO) continues to the south of the Laurieston Fault; between the faults lies the recently-defined Ettrick Group. Beyond the eastern end of the Lower Palaeozoic outcrop, its geochemical lineaments extend across the unconformable cover of Devonian "Old Red Sandstone". This is partly a drainage catchment effect, but two other possible explanations are considered: a localized derivation of the Devonian clastic rocks, such that they inherit the compositional patterns of the underlying Lower Palaeozoic sandstones; or a geochemical signature imposed by glacial deposits derived from the Lower Palaeozoic outcrop. The local effect of glacial dispersion is confirmed by the distribution of TiO (sub 2) ; anomalously high levels associated with Carboniferous mafic lavas have been transported NE across the low-TiO (sub 2) Carboniferous sedimentary rocks of the Tweed Basin.


ISSN: 0036-9276
EISSN: 2041-4951
Coden: SJGEAX
Serial Title: Scottish Journal of Geology
Serial Volume: 49
Serial Issue: 1
Title: Regional geochemical patterns in SE Scotland; source lithology, inheritance and glacial overprinting
Affiliation: British Geological Survey, Edinburgh, United Kingdom
Pages: 33-40
Published: 201305
Text Language: English
Publisher: Geological Society Publishing House for the Geological Societies of Edinburgh and Glasgow, Bath, United Kingdom
References: 26
Accession Number: 2014-001925
Categories: Geochemistry of rocks, soils, and sedimentsSedimentary petrology
Document Type: Serial
Bibliographic Level: Analytic
Illustration Description: illus. incl. geol. sketch maps
N54°40'00" - N61°00'00", W08°30'00" - W00°45'00"
Country of Publication: United Kingdom
Secondary Affiliation: GeoRef, Copyright 2017, American Geosciences Institute. Reference includes data from The Geological Society, London, London, United Kingdom
Update Code: 201403
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