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Lithospheric-scale extension during Grampian orogenesis in Scotland

Viete, Daniel; Richards, Simon; Lister, Gordon; Oliver, Grahame J.H.; Banks, Graham J

Description

This contribution presents a new model for the Grampian-age tectonothermal development of the Buchan Block and Barrovian-type regions to its west, in the Grampian Terrane, Scotland. The model has drawn on evidence gathered from field mapping, microstructural analysis, metamorphic petrology and mafic magma geochemistry to propose that emplacement of the Grampian gabbros and regional metamorphic heating associated with production of Barrovian- and Buchan-type units occurred during syn-orogenic...[Show more]

dc.contributor.authorViete, Daniel
dc.contributor.authorRichards, Simon
dc.contributor.authorLister, Gordon
dc.contributor.authorOliver, Grahame J.H.
dc.contributor.authorBanks, Graham J
dc.date.accessioned2015-12-10T22:36:19Z
dc.identifier.isbn1862393001
dc.identifier.urihttp://hdl.handle.net/1885/56636
dc.description.abstractThis contribution presents a new model for the Grampian-age tectonothermal development of the Buchan Block and Barrovian-type regions to its west, in the Grampian Terrane, Scotland. The model has drawn on evidence gathered from field mapping, microstructural analysis, metamorphic petrology and mafic magma geochemistry to propose that emplacement of the Grampian gabbros and regional metamorphic heating associated with production of Barrovian- and Buchan-type units occurred during syn-orogenic (Grampian-age), lithospheric-scale extension. Extension followed lithospheric thickening associated with the initiation of Grampian orogenesis and was followed by renewed lithospheric thickening and termination of the extensional heating. Mantle melting to produce the Grampian gabbros of the Grampian Terrane was achieved by extensional thinning of the lithosphere and decompression melting of the asthenosphere at depths of less than 70 km. Advection of heat from the mantle with emplacement of the Grampian gabbros augmented elevated heat budgets associated with attenuation of isotherms during extension. Deposition of the uppermost Dalradian (the Whitehills and Boyndie Bay Groups and the Macduff Slates) occurred during Grampian-age lithospheric extension. A gently-dipping, mid-crustal detachment focused metamorphic heat sources and accommodated significant lithospheric-scale strain, allowing independent thermal evolution of units in its hanging wall (the Buchan Block) and footwall (Barrovian-type units).
dc.publisherGeological Society of London
dc.relation.ispartofContinental Tectonics and Mountain Building: The Legacy of Peach and Horne
dc.subjectKeywords: crustal thickening; decompression; detachment fault; extensional tectonics; heat budget; lithospheric structure; mantle source; numerical model; orogeny; shear strain; tectonic evolution; tectonic setting; tectonophysics; thermal evolution; Grampian Highl
dc.titleLithospheric-scale extension during Grampian orogenesis in Scotland
dc.typeBook chapter
local.description.notesImported from ARIES
dc.date.issued2010
local.identifier.absfor040402 - Geodynamics
local.identifier.absfor040312 - Structural Geology
local.identifier.absfor040313 - Tectonics
local.identifier.ariespublicationu9503261xPUB369
local.type.statusPublished Version
local.contributor.affiliationViete, Daniel, College of Physical and Mathematical Sciences, ANU
local.contributor.affiliationRichards, Simon, James Cook University
local.contributor.affiliationLister, Gordon, College of Physical and Mathematical Sciences, ANU
local.contributor.affiliationOliver, Grahame J.H., University of St. Andrews
local.contributor.affiliationBanks, Graham J, Cardiff University
local.description.embargo2037-12-31
local.bibliographicCitation.startpage880
local.identifier.doi10.1144/SP335.7
local.identifier.absseo840105 - Precious (Noble) Metal Ore Exploration
dc.date.updated2016-02-24T12:02:25Z
local.bibliographicCitation.placeofpublicationLondon
local.identifier.scopusID2-s2.0-77956007268
CollectionsANU Research Publications

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