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Sarn Complex

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General

The Sarn Complex is a group of closely related igneous rocks that intrude and cut through other rock lithologies in the Cymru Terrane in Wales, United Kingdom. [1] The complex outcrops on the Llyn Peninsula in a variety of places including Mynydd Cefnamlwch and the flanks of Pen y Gopa. [2]

Sarn Complex

The largest plutonic body in the terrane has limited outcrop and is sheared by the Llyn Shear Zone in the west and covered by later (Arenig) sediments to the east.[1] Altered to Greenschist facies the pluton contains a bimodal suite of gabbro-diorite, monzogranite (Sarn Granite) and granodiorite.[3]

References

  1. ^ a b P. J. Brenchley, P. F. Rawson The Geology of England and Wales, 2006, 2nd Ed
  2. ^ http://www.bgs.ac.uk/Lexicon/lexicon.cfm?pub=ARN
  3. ^ P. J. Patchett & J. Jocelyn U-Pb zircon ages for late Precambrian igneous rocks in South Wales., 1979, Journal of the Geological Society of London. 136 13-19
  • The Geology of Wales - BGS [1]
  • BGS Rock Lexicon [2]
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