U-Pb geochronological constraints on the timing of plutonism, volcanism, and sedimentation, Jersey, Channel Islands, UK

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doi: 10.1144/jgs.158.2.243
Authors:Miller, Brent V.; Samson, Scott D.; d'Lemos, Richard S.
Author Affiliations:Primary:
Syracuse University, Department of Earth Sciences, Syracuse, NY, United States
Other:
Oxford Brookes University, United Kingdom
Volume Title:Journal of the Geological Society of London
Source:Journal of the Geological Society of London, Vol.158(Part 2), p.243-252. Publisher: Geological Society of London, London, United Kingdom. ISSN: 0016-7649
Publication Date:2001
Note:In English. 54 refs.; illus., incl. 1 table, geol. sketch map
Summary:Uranium-lead dates for single and small multiple grain zircon separates are presented for the main geological units from Jersey, British Channel Islands. A turbiditic sandstone from the Jersey Shale Formation (Brioverian Supergroup) contains detrital zircons of a variety of ages, ranging from c. 2.6 to 0.6 Ga. The youngest zircons yielded nearly concordant U-Pb dates of 586.7±3.0 Ma and 587.1±2.7 Ma providing a maximum depositional age for the unit. Zircons from overlying volcanic rocks (Anne Port Rhyolite) give an upper intercept date of 582.8+3-2.7 Ma, considered to be the age of eruption. The undeformed SW Jersey granite, which intrudes and locally thermally metamorphoses the folded Jersey Shale Formation, is dated at 580+2.3-1.6 Ma. These dates constrain tightly the timing of deposition of the Jersey Shale Formation and the age of deformation on Jersey, and indicate a dynamic arc environment during the late Neoproterozoic. Zircons from the NW Jersey granite define an upper intercept date of 482.7±1.6 Ma, similar to the previously reported 40Ar/39Ar hornblende date of c. 473 Ma, confirming a renewed pulse of magmatism during the Ordovician in this sector of Cadomia.
Sections:Age determination
Subjects:Absolute age; Brioverian; Cadomian Orogeny; Dates; Metagranite; Metaigneous rocks; Metamorphic rocks; Neoproterozoic; Precambrian; Proterozoic; U/Pb; Upper Precambrian; Volcanism; English Channel Islands; Europe; Jersey; United Kingdom; Western Europe; Jersey Shale
Coordinates:N490900 N491500 W0020200 W0021700
Abstract Numbers:01M/2399
Record ID:2001026525
Copyright Information:GeoRef, Copyright 2019 American Geosciences Institute. Reference includes data from The Geological Society, London, London, United Kingdom
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