Storey, C.D.; Brewer, T.S. and Temperley, S.
|DOI (Digital Object Identifier) Link:||http://doi.org/10.1017/S001675680500110X|
|Google Scholar:||Look up in Google Scholar|
Peak and retrograde P-T conditions of Grenville-age eclogites from the Glenelg-Attadale Inlier of the northwest Highlands of Scotland are presented. Peak conditions are estimated as c. 20 kbar and 750-780 degrees C, in broad agreement with previous work. The eclogites subsequently followed a steep decompression path to c. 13 kbar and 650-700 degrees C during amphibolite facies retrogression. Peak eclogite facies metamorphism occurred > 1080 Ma and retrogression at c. 995 Ma, suggesting fairly sluggish uplift rates of < 0.3 km/Ma and cooling rates of < 1.25 degrees C/Ma, when compared with other parts of the Grenville orogeny and/or modem orogens. However, current poor constraints on the timing of peak metamorphism mean that these rates cannot be used to interpret the geodynamic evolution of this part of the orogen. The P-T-t data, together with petrology and the field relationships between the basement rocks of the Glenelg-Attadale Inlier and the overlying Moine Supergroup, mean that it is difficult to support the currently held view that an unconformable relationship exists between the two. It is suggested that more data are required in order to re-interpret the Neoproterozic tectonic evolution of the northwest Highlands of Scotland.
|Item Type:||Journal Article|
|Copyright Holders:||2005 Cambridge University Press|
|Keywords:||P–T conditions; eclogite; retrograde; Moinian; Scotland|
|Academic Unit/Department:||Science > Environment, Earth and Ecosystems
|Depositing User:||Colin Smith|
|Date Deposited:||03 Sep 2009 13:25|
|Last Modified:||15 Jan 2016 11:47|
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