The origin and significance of the Delaney Dome Formation, Connemara, Ireland

A. E. Draut, Peter Dominic Clift

Research output: Contribution to journalArticle

16 Citations (Scopus)

Abstract

Dalradian meta-sediments of the Laurentian margin and mafic intrusions thereof in SW Connemara, Ireland, tectonically overlie meta-rhyolites of the Delaney Dome Formation. The two units are separated by the Mannin Thrust. A new U-Pb age of 474.6 +/- 5.5 Ma shows that the Delaney Dome Formation is a temporal equivalent of arc volcanic rocks preserved in the adjacent South Mayo Trough: the Tourmakeady Volcanic Group, erupted during the collision of an oceanic island arc with the Laurentian margin in the Grampian Orogeny. New rare earth and high field strength element data show that the Delaney Dome Formation and Tourmakeady Volcanic Group are chemically similar and arc-like in character. This suggests that the Delaney Dome Formation is an along-strike equivalent of the Tourmakeady Group. strike-slip faulted south of the South Mayo Trough during or after the Grampian Orogeny. Further correlation of these units with northern Appalachian rhyolites is also possible, The Delaney Dome Formation is an extrusive temporal equivalent of intrusions that penetrate the Connemara Dalradian. Thus. movement along the Mannin Thrust brought mid-crustal plutons and Dalradian country rocks tectonically above the extrusive volcanic sequence. The Mannin Thrust is identified as a major imbricating structure within a continental arc, but not a terrane boundary.

Original languageEnglish
Pages (from-to)95-103
Number of pages8
JournalJournal of the Geological Society
Volume159
Issue number1
Publication statusPublished - 2002

Keywords

  • Ireland
  • Grampian Orogeny
  • U-Pb
  • geochemistry
  • subduction
  • plate collision
  • WESTERN IRELAND
  • ISLAND-ARC
  • IRISH CALEDONIDES
  • GRAMPIAN OROGENY
  • SOUTH MAYO
  • U-PB
  • NEWFOUNDLAND
  • EVOLUTION
  • EXTENSION
  • MODEL

Cite this

The origin and significance of the Delaney Dome Formation, Connemara, Ireland. / Draut, A. E.; Clift, Peter Dominic.

In: Journal of the Geological Society , Vol. 159, No. 1, 2002, p. 95-103.

Research output: Contribution to journalArticle

Draut, A. E. ; Clift, Peter Dominic. / The origin and significance of the Delaney Dome Formation, Connemara, Ireland. In: Journal of the Geological Society . 2002 ; Vol. 159, No. 1. pp. 95-103.
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