Localized uplift in the Scottish Dalradian

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Authors:Dempster, T. J.
Author Affiliations:Primary:
Univ. Edinburgh, Grant Inst. Geol., Edinburgh, United Kingdom
Volume Title:Nature (London)
Source:Nature (London), 307(5947), p.156-159. Publisher: Macmillan Journals, London, United Kingdom. ISSN: 0028-0836
Publication Date:1984
Note:In English. 25 refs.; illus. incl. 5 anal., 1 table, sketch map
Summary:Rb/Sr mica ages are reported from the Dalradian meta-sediments of the Angus region, Scottish Highlands, in a study of the uplift history of this classic metamorphic terrain. The samples come from across the Barrovian metamorphic zones and provide evidence of diachroneity in both metamorphism and later cooling. Thus, the oldest mineral ages, and hence earliest cooling, are found in the highest grade metamorphic rocks to the north. The results show the importance of tectonically controlled, localized uplift processes. Given that erosion is an important influence on the thermal development of metamorphic rocks, the constant or steadily decaying isostatic uplift rates, often assumed in models of orogenic belts, may be a marked oversimplification of the real events. [T.R.]
Subjects:Absolute age; Cambrian; Cooling; Dalradian; Dates; Geochronology; Grade; Isostasy; Metamorphic rocks; Metamorphism; Mica group; Orogenic belts; Paleozoic; Rb/Sr; Regional metamorphism; Sheet silicates; Silicates; Temperature; Thermal history; Uplifts; Whole rock; Europe; Great Britain; Northern Highlands; Scotland; United Kingdom; Western Europe; Barrovian Zone
Coordinates:N563500 N570000 W0023000 W0033000
Abstract Numbers:84M/3639
Record ID:1984045979
Copyright Information:GeoRef, Copyright 2019 American Geosciences Institute. Reference includes data from Mineralogical Abstracts, United Kingdom, Twickenham, United Kingdom
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