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

B. V. Miller, S. D. Samson, R. S. D'Lemos

Research output: Contribution to journalArticle

31 Scopus citations

Abstract

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.

Original languageEnglish (US)
Pages (from-to)243-252
Number of pages10
JournalJournal of the Geological Society
Volume158
Issue number2
DOIs
StatePublished - Nov 7 2001

Keywords

  • Absolute age
  • Cadomian Orogeny
  • Channel Islands
  • Jersey
  • U-P

ASJC Scopus subject areas

  • Geology

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