Uplift patterns and orogenic evolution in the Scottish Dalradian

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doi: 10.1144/gsjgs.142.1.0111
Authors:Dempster, T. J.
Author Affiliations:Primary:
University of Edinburgh, Grant Institute of Geology, Edinburgh, United Kingdom
Other:
Leeds University, United Kingdom
Volume Title:Conditions of Dalradian metamorphism
Volume Authors:Graham, Colin M., convener; Harte, Ben
Source:Journal of the Geological Society of London, Vol.142(Part 1), p.111-128; Conditions of Dalradian metamorphism, Edinburgh, United Kingdom, Sept. 20-21, 1983, convened by Colin M. Graham and Ben Harte. Publisher: Geological Society of London, London, United Kingdom. ISSN: 0016-7649
Publication Date:1985
Note:In English. Includes appendices. 44 refs.; illus., incl. 3 tables, geol. sketch maps
Summary:Numerous Rb/Sr and K/Ar mineral ages from the Dalradian rocks of Angus and Perthshire indicate considerable diachronism of cooling, following the Caledonian regional metamorphism. The oldest mineral ages (approx 515 m.y.) are similar to the independent estimates of peak metamorphic age, and hence indicate very rapid cooling; they occur in the highest grade samples of the Angus region and are associated with localized uplift. Regional rapid uplift events at 460-440 and 410-390 m.y. may also be recognized and correlated with structural and igneous activity and metamorphic dates within the Scottish Highlands. Thermal models show the importance of localized and discontinuous uplift in determining both the timing of metamorphism and the shape of the P-T paths; the major diachroneity of metamorphism (and granite production) in the Scottish Highlands is probably depth controlled rather than representing major lateral diachroneity of thickening or heat sources. Localized uplift may exercise considerable control on mineral facies variation within orogenic belts. The uniform block uplift models frequently used in the interpretation of metamorphic and structural phenomena in orogenic belts are an oversimplification of the real events. [R.A.H.]
Subjects:Absolute age; Amphibole group; Caledonian Orogeny; Chain silicates; Cooling; Dalradian; Dates; Deformation; Erosion; Geotraverses; Granites; Igneous rocks; Intrusions; Isograds; Isotope ratios; Isotopes; K/Ar; Lower Paleozoic; Magmatism; Metamorphism; Mica group; Mineral composition; Models; Orogenic belts; Orogeny; P-T conditions; P-T-t paths; Paleozoic; Plutonic rocks; Rb/Sr; Regional metamorphism; Sheet silicates; Silicates; Stratigraphic units; Tectonics; Uplifts; Zoning; Europe; Great Britain; Scotland; United Kingdom; Western Europe
Coordinates:N561500 N570000 W0023000 W0034500
Abstract Numbers:85M/1079
Record ID:2003045109
Copyright Information:GeoRef, Copyright 2019 American Geosciences Institute. Reference includes data from Mineralogical Abstracts, United Kingdom, Twickenham, United Kingdom
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072 7 |a 05A  |2 georeft 
072 7 |a 03  |2 georeft 
100 1 |a Dempster, T. J.  |e analytic author  |u University of Edinburgh, Grant Institute of Geology, Edinburgh 
245 1 0 |a Uplift patterns and orogenic evolution in the Scottish Dalradian 
300 |a p. 111-128 
500 |a In English. Includes appendices. 44 refs. 
500 |a Abstract number: 85M/1079 
500 |a Abstractor: R.A.H. 
500 |a Affiliation: University of Edinburgh, Grant Institute of Geology; Edinburgh; GBR; United Kingdom 
500 |a Affiliation: Leeds University; ; GBR; United Kingdom 
500 |a Key title: Journal of the Geological Society of London 
500 |a Source note: Journal of the Geological Society of London, Vol.142(Part 1), p.111-128; Conditions of Dalradian metamorphism, Edinburgh, United Kingdom, Sept. 20-21, 1983, convened by Colin M. Graham and Ben Harte. Publisher: Geological Society of London, London, United Kingdom. ISSN: 0016-7649 
500 |a Publication type: conference paper or compendium article 
504 |b 44 refs. 
510 3 |a GeoRef, Copyright 2019 American Geosciences Institute. Reference includes data from Mineralogical Abstracts, United Kingdom, Twickenham, United Kingdom 
520 |a Numerous Rb/Sr and K/Ar mineral ages from the Dalradian rocks of Angus and Perthshire indicate considerable diachronism of cooling, following the Caledonian regional metamorphism. The oldest mineral ages (approx 515 m.y.) are similar to the independent estimates of peak metamorphic age, and hence indicate very rapid cooling; they occur in the highest grade samples of the Angus region and are associated with localized uplift. Regional rapid uplift events at 460-440 and 410-390 m.y. may also be recognized and correlated with structural and igneous activity and metamorphic dates within the Scottish Highlands. Thermal models show the importance of localized and discontinuous uplift in determining both the timing of metamorphism and the shape of the P-T paths; the major diachroneity of metamorphism (and granite production) in the Scottish Highlands is probably depth controlled rather than representing major lateral diachroneity of thickening or heat sources. Localized uplift may exercise considerable control on mineral facies variation within orogenic belts. The uniform block uplift models frequently used in the interpretation of metamorphic and structural phenomena in orogenic belts are an oversimplification of the real events. 
650 7 |a Absolute age  |2 georeft 
650 7 |a Amphibole group  |2 georeft 
650 7 |a Caledonian Orogeny  |2 georeft 
650 7 |a Chain silicates  |2 georeft 
650 7 |a Cooling  |2 georeft 
650 7 |a Dalradian  |2 georeft 
650 7 |a Dates  |2 georeft 
650 7 |a Deformation  |2 georeft 
650 7 |a Erosion  |2 georeft 
650 7 |a Geotraverses  |2 georeft 
650 7 |a Granites  |2 georeft 
650 7 |a Igneous rocks  |2 georeft 
650 7 |a Intrusions  |2 georeft 
650 7 |a Isograds  |2 georeft 
650 7 |a Isotope ratios  |2 georeft 
650 7 |a Isotopes  |2 georeft 
650 7 |a K/Ar  |2 georeft 
650 7 |a Lower Paleozoic  |2 georeft 
650 7 |a Magmatism  |2 georeft 
650 7 |a Metamorphism  |2 georeft 
650 7 |a Mica group  |2 georeft 
650 7 |a Mineral composition  |2 georeft 
650 7 |a Models  |2 georeft 
650 7 |a Orogenic belts  |2 georeft 
650 7 |a Orogeny  |2 georeft 
650 7 |a P-T conditions  |2 georeft 
650 7 |a P-T-t paths  |2 georeft 
650 7 |a Paleozoic  |2 georeft 
650 7 |a Plutonic rocks  |2 georeft 
650 7 |a Rb/Sr  |2 georeft 
650 7 |a Regional metamorphism  |2 georeft 
650 7 |a Sheet silicates  |2 georeft 
650 7 |a Silicates  |2 georeft 
650 7 |a Stratigraphic units  |2 georeft 
650 7 |a Tectonics  |2 georeft 
650 7 |a Uplifts  |2 georeft 
650 7 |a Zoning  |2 georeft 
651 7 |a Europe  |2 georeft 
651 7 |a Great Britain  |2 georeft 
651 7 |a Scotland  |2 georeft 
651 7 |a United Kingdom  |2 georeft 
651 7 |a Western Europe  |2 georeft 
700 1 |a Harte, Ben,  |e monographic convener  |u Leeds University 
711 2 |a Conditions of Dalradian metamorphism  |d (1983 :  |c Edinburgh, United Kingdom)  
773 0 |a Graham, Colin M., convener  |t Conditions of Dalradian metamorphism  |d London : Geological Society of London, Jan. 1985  |k Journal of the Geological Society of London  |x 0016-7649  |y JGSLAS  |n Journal of the Geological Society of London, Vol.142(Part 1), p.111-128; Conditions of Dalradian metamorphism, Edinburgh, United Kingdom, Sept. 20-21, 1983, convened by Colin M. Graham and Ben Harte. Publisher: Geological Society of London, London, United Kingdom. ISSN: 0016-7649 Publication type: conference paper or compendium article  |g Vol. 142, Part 1  |h illus., incl. 3 tables, geol. sketch maps 
856 |u urn:doi: 10.1144/gsjgs.142.1.0111