A preliminary volcanological and petrochemical survey of the late Precambrian calc-alkaline volcanic succession of eastern Jersey, Channel Islands

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Authors:Lees, G. J.; Roach, R. A.
Author Affiliations:Primary:
Keele University, Department of Geology, Keele, United Kingdom
Volume Title:Annual conference of the Ussher Society
Volume Authors:Williams, B.J., editor
Source:Proceedings of the Ussher Society, Vol.8(Part 2), p.145-150; Annual conference of the Ussher Society, United Kingdom, Jan. 1993, edited by B.J. Williams. Publisher: Ussher Society, Bristol, United Kingdom. ISSN: 0566-3954
Publication Date:1993
Note:In English. 15 refs.; illus., incl. geol. sketch map
Summary:The Jersey volcanic rocks are a succession of mainly intermediate to acidic rocks, over 2200 m thick, formed of lava flows, pyroclastic ash-flow deposits, shallow massive domes and volcaniclastic deposits largely of mass flow derivation. It is considered that a magmatic suite ofcoeval magmas erupted in a subaqueous environment under conditions of great local instability. The instability is reflected in the development throughout the volcanic pile of debris flows, with variable admixtures of basic to acidic lava clasts, pyroclastic ejectamenta and epiclastic material. The volcanism is of calc-alkaline type, with a high K2O signature, which is probably a primary feature of the suite. This shoshonitic character is in accord with the potassic-rich nature of other late Cadomian magmatic episodes on Jersey, as shown by the younger granitic plutonic complexes and the later extensional bimodal magmatism of the main dyke swarm of Jersey. [R.A.H.]
Subjects:Andesites; Basalts; Cadomian Orogeny; Calc-alkalic composition; Igneous rocks; Ignimbrite; Metals; Niobium; Precambrian; Pyroclastics; Rare earths; Volcanic rocks; Yttrium; Zirconium; Armorican Massif; English Channel Islands; Europe; France; Jersey; United Kingdom; Western Europe; Jersey Volcanic Group
Abstract Numbers:94M/3678
Record ID:1995010492
Copyright Information:GeoRef, Copyright 2019 American Geosciences Institute. Reference includes data from Mineralogical Abstracts, United Kingdom, Twickenham, United Kingdom
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