The geometry of the Iapetus Suture Zone in central Ireland deduced from a magnetotelluric study

C. K. Rao, Alan G. Jones, Max Moorkamp

Research output: Contribution to journalArticleResearchpeer-review

Abstract

The crustal geometry of the Iapetus Suture Zone (ISZ) in central Ireland is inferred from an electrical resistivity model derived from broadband and long period magnetotelluric measurements along a 200-km-long NNW-SSE profile. The model highlights an undulating high conductivity layer of thickness 10-15 km and resistivity 2-5 Ω m, at middle to lower crustal depths interpreted as sulphide-bearing graphitic sediments deposited between the converging continents of Laurentia and Avalonia during the closure of the Iapetus Ocean. The sediments underwent sinistral, transpressional deformation during convergence, and movements along the faults transported the sediments to depths of 5-10 km forming the U-shaped conductor beneath the centre of the profile correlative with the inferred location of the Iapetus Suture Zone. Two high resistivity blocks identified above the U-shaped conductor are interpreted as Caledonian granite bodies, and likely relate to late Caledonian igneous activity.

Original languageEnglish
Pages (from-to)134-141
Number of pages8
JournalPhysics of the Earth and Planetary Interiors
Volume161
Issue number1-2
DOIs
Publication statusPublished - 16 Apr 2007
Externally publishedYes

Keywords

  • Iapetus Suture
  • Ireland
  • Magnetotellurics
  • Tectonics

Fingerprint Dive into the research topics of 'The geometry of the Iapetus Suture Zone in central Ireland deduced from a magnetotelluric study'. Together they form a unique fingerprint.

Cite this