Metamorphism and fluid infiltration of the calc-silicate aureole of the Beinn an Dubhaich Granite, Skye

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Authors:Holness, Marian B.
Author Affiliations:Primary:
University of Cambridge, Department of Earth Science, Cambridge, United Kingdom
Volume Title:Journal of Petrology
Source:Journal of Petrology, 33(6), p.1261-1293. Publisher: Clarendon Press, Oxford, United Kingdom. ISSN: 0022-3530
Publication Date:1992
Note:In English. 44 refs.; illus. incl. 4 tables, geol. sketch maps
Summary:This Tertiary granite was intruded at approx 750 degrees C and 0.5 kbar into siliceous dolostones and limestones with the consequent development of talc, tremolite, diopside, olivine and periclase in the bulk of the aureole, and abundant fluoro- borosilicate skarns [M.M. 29-621] adjacent to the pluton. With increasing grade the limestones develop the sequence talc, tremolite, diopside and olivine, whereas the dolostones develop the sequence talc, tremolite, olivine and periclase. The abundant chert nodules in the dolostones take either reaction path, dependent on their size: those < approx 2-7 mm in diameter follow the dolostone sequence, whereas larger nodules follow the limestone reaction path. The presence of monticellite in the highest grade rocks points to the flushing of the contact by volumes of water-rich fluid, derived presumably from the granite. Using simple box models with constant porosity, it is shown that the observed reaction progress in olivine-grade and talc-grade rocks can only be accounted for if the rocks were infiltrated by substantial volumes of hydrous fluid. [R.A.H.]
Subjects:Aureoles; Calc-silicate composition; Cenozoic; Contact metamorphism; Fluid phase; Granites; Igneous rocks; Infiltration; Intrusions; Low-grade metamorphism; Metamorphic rocks; Metamorphism; Metasedimentary rocks; Metasomatic rocks; Plutonic rocks; Plutons; Skarn; Tertiary; Water; Europe; Great Britain; Hebrides; Highland region Scotland; Inner Hebrides; Inverness-shire Scotland; Isle of Skye; Scotland; United Kingdom; Western Europe; Beinn an Dubhaich Granite; Durness Group
Abstract Numbers:93M/4942
Record ID:1993046450
Copyright Information:GeoRef, Copyright 2019 American Geosciences Institute. Reference includes data from Mineralogical Abstracts, United Kingdom, Twickenham, United Kingdom
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