Application of mineral thermometers and barometers to granitoid igneous rocks; the Etive Complex, W Scotland

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doi: 10.1007/s00710-004-0059-z
Authors:Moazzen, M.; Droop, G. T. R.
Author Affiliations:Primary:
University of Tabriz, Department of Geology, Tabriz, Iran
University of Manchester, United Kingdom
Volume Title:Mineralogy and Petrology
Source:Mineralogy and Petrology, 83(1-2), p.27-53. Publisher: Springer-Verlag, Vienna, Austria. ISSN: 0930-0708
Publication Date:2005
Note:In English; illus., incl. 8 tables, geol. sketch maps
Summary:The Etive complex, one of the Caledonian "Newer Granites" of Scotland, is a ring complex of Devonian age, ranging in composition from pyroxene-diorite to leucogranite. Six samples, representing the major rock units in the southern parts of the Etive complex were chosen for mineral chemical studies and for estimation of the pressure and temperature conditions of magmatic crystallisation. Application of Al- in-hornblende barometry and crossite contents of amphiboles indicates a pressure <3 kbar for the intrusion, in good agreement with published independent pressure estimates of ∼2 kbar from mineral equilibria in metasedimentary hornfelses in the Etive thermal aureole. Thermometry, using ternary and binary feldspar systems, yields low temperatures, which probably reflect late-stage, post-magmatic re-equilibration of these minerals. Several geothermometers have been applied to the Quarry diorite, the outermost intrusion of the complex. The highest temperature for the rocks comes from orthopyroxene-clinopyroxene solvus thermometry, and is ∼1000°C; this is interpreted to reflect the initial crystallisation of the diorite magma immediately after its emplacement. The maximum temperature from hornblende-plagioclase thermometer is ∼816°C, which probably reflects late-stage crystallisation of the magma. [H.P.B.]
Subsections:Igneous petrology
Subjects:Amphibole group; Biotite; Chain silicates; Chemical composition; Devonian; Diorites; Feldspar group; Framework silicates; Geologic barometry; Geologic thermometry; Granites; Granodiorites; Igneous rocks; Intrusions; Mica group; Mineral composition; Paleozoic; Paragenesis; Plutonic rocks; Pyroxene group; Ring complexes; Sheet silicates; Silicates; Europe; Great Britain; Scotland; Scottish Highlands; United Kingdom; Western Europe; Etive Complex; Quarry Diorite; Western Scotland
Abstract Numbers:05M/911
Record ID:2011020585
Copyright Information:GeoRef, Copyright 2019 American Geosciences Institute. Reference includes data from Mineralogical Abstracts, United Kingdom, Twickenham, United Kingdom, Reference includes data from Geoline, Bundesanstalt fur Geowissenschaften und Rohstoffe
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