Fluid escape structures in metagabbroic "sediments", SE Jersey, Channel Islands

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Authors:Key, C. H.
Author Affiliations:Primary:
Goldsmiths' Col., Dep. Geol., London, United Kingdom
Volume Title:Proceedings of the Geologists' Association
Source:Proceedings of the Geologists' Association, Vol.96 (Part 2), p.153-159. Publisher: Geologists' Association, London, United Kingdom. ISSN: 0016-7878
Publication Date:1985
Note:In English. 23 refs.; illus. incl. geol. sketch map
Summary:Layered diorites in SE Jersey have been derived from an earlier layered gabbro by metasomatic recrystallization caused by granite intrusions. Relict patches of metagabbro still possess much of the primary mineralogy and cumulate textures and structures, the most distinctive of which is small-scale or 'microrhythmic' layering. Disrupted microrhythmic layering appears analogous to the dish structures described from some clastic sediments, and a similar origin, by fluid escape from a compacting, unconsolidated crystal mush, is proposed. This process of continuous crystal compaction and return of pore fluid to the main magma body has some important implications for modern cumulus theory, especially the model of in situ crystallization from a static boundary layer. (Author's abstract) [P.Br.]
Subjects:Caledonian Orogeny; Compaction; Diorites; Igneous rocks; Intrusions; Metagabbro; Metaigneous rocks; Metamorphic rocks; Metasomatism; Paleozoic; Petrology; Plutonic rocks; Pore water; English Channel Islands; Europe; Great Britain; Jersey; United Kingdom; Western Europe; Fluid escape structures; Le Nez Gabbros; Microrythmic layering; Southeastern Jersey
Abstract Numbers:86M/0957
Record ID:1986000808
Copyright Information:GeoRef, Copyright 2019 American Geosciences Institute. Reference includes data from Mineralogical Abstracts, United Kingdom, Twickenham, United Kingdom
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