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Basin thermal history favours an accretionary origin for the Southern Uplands Terrane, Scottish Caledonides

P. Stone and R. J. Merriman
Basin thermal history favours an accretionary origin for the Southern Uplands Terrane, Scottish Caledonides
Journal of the Geological Society of London (September 2004) 161, Part 5: 829-836

Abstract

There is general agreement that the Siluro-Ordovician, Southern Uplands suspect terrane is an imbricate thrust belt formed adjacent to the Laurentian continental margin during closure of the Iapetus Ocean. However, there are conflicting models for its tectonosedimentary evolution, especially for the initial depositional environment. Was it a convergent forearc trench with subsequent incorporation of strata into a suprasubduction accretionary prism, or was it a back-arc or continental margin extensional basin subsequently caught up in a foreland fold and thrust belt? To address this issue the different thermal histories of the contrasting convergent and extensional sedimentary basin models have been investigated. Palaeogeothermal conditions in the Southern Uplands terrane, assessed from regional metamorphic patterns, clay mineral assemblages and K-white mica composition, rule out extension and support deposition in a low heat-flow, plate-convergent setting. There is no evidence for a change from extensional to convergent basin regimes from north to south, as required in some models. Instead, throughout the terrane, there is a close temporal and spatial relationship between deposition, burial metamorphism and tectonism that is elsewhere typical of accretion.


ISSN: 0016-7649
EISSN: 2041-479X
Coden: JGSLAS
Serial Title: Journal of the Geological Society of London
Serial Volume: 161, Part 5
Title: Basin thermal history favours an accretionary origin for the Southern Uplands Terrane, Scottish Caledonides
Affiliation: British Geological Survey, Edinburgh, United Kingdom
Pages: 829-836
Published: 200409
Text Language: English
Publisher: Geological Society of London, London, United Kingdom
References: 59
Accession Number: 2004-076608
Categories: Structural geology
Document Type: Serial
Bibliographic Level: Analytic
Illustration Description: illus. incl. 1 table, geol. sketch map
N54°00'00" - N56°00'00", W05°00'00" - W02°00'00"
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: 200422
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