Processes and conditions during contact anatexis, melt escape and restite formation; the Huntly Gabbro Complex, NE Scotland

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doi: 10.1093/petrology/44.6.995
Authors:Droop, G. T. R.; Clemens, J. D.; Dalrymple, D. J.
Author Affiliations:Primary:
University of Manchester, Department of Earth Sciences, Manchester, United Kingdom
Other:
Kingston University, United Kingdom
Volume Title:Journal of Petrology
Source:Journal of Petrology, 44(6), p.995-1029. Publisher: Oxford University Press, Oxford, United Kingdom. ISSN: 0022-3530
Publication Date:2003
Note:In English. 170 refs.; illus., incl. 8 tables, geol. sketch maps
Summary:Ordovician (470 m.y.) syn-metamorphic intrusions of mafic magma into 550°C Dalradian metapelites caused partial melting at 900°C similar to that described for contemporaneous rocks in Connemara, Western Ireland. The anatectic melts were peraluminous, water-undersaturated, potassic granitic magmas which were segregated and escaped under gravitational processes to give S-type granites. Orthopyroxene-garnet-cordierite-hercynite-plagioclase assemblages are the highest grade diatexites, formed at 900°C and 0.45 GPa, corresponding with an emplacement depth of ∼ 16 km. Melt compositions and proportions were confirmed by experimental partial melting. Orthopyroxene-cordierite xenoliths are restites left after extraction of ∼ 60% of melt. EPMA of garnet, biotite, muscovite, plagioclase, staurolite, cordierite, orthopyroxene, hercynite and K-feldspar are listed. [B.E.L.]
Sections:Petrology
Subsections:Metamorphism: thermal, metasomatic
Subjects:Anatexis; Contact metamorphism; Emplacement; Gabbros; Igneous rocks; Intrusions; Layered intrusions; Melts; Metamorphism; Ordovician; P-T conditions; Paleozoic; Plutonic rocks; Processes; Restites; Europe; Great Britain; Scotland; United Kingdom; Western Europe; Huntly Complex; Melt escape; Northeastern Scotland
Abstract Numbers:03M/4824
Record ID:2003058969
Copyright Information:GeoRef, Copyright 2019 American Geosciences Institute. Reference includes data from Mineralogical Abstracts, United Kingdom, Twickenham, United Kingdom
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