Sarn Complex

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.[1] The complex outcrops on the Llŷn Peninsula in a variety of places including Mynydd Cefnamlwch and the flanks of Pen y Gopa.[2]

Geological information

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.

The Sarn granite is leucocratic and covers an expanse of about 6 km2 in contrast to the gabbro and diorite that exist as small and scattered exposures. The dioritic component of the complex has been confirmed as having a Neoproterozoic age of 614 ±2 Ma using U-Pb zircon dating.[3] Therefore, the shearing of the Llyn is also temporally constrained by the date.

References

  1. ^ a b P. J. Brenchley, P. F. Rawson The Geology of England and Wales, 2006, 2nd Ed
  2. ^ BGS Lexicon of Named Rock Units
  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

Content Disclaimer

Informasi ini disarikan dari Wikipedia dan disajikan kembali untuk tujuan edukasi. Konten tersedia di bawah lisensi CC BY-SA 3.0. Kami tidak bertanggung jawab atas ketidakakuratan data yang bersumber dari kontribusi publik tersebut.

  1. The information displayed on this website is sourced in part or in whole from Wikipedia and has been adapted for the purpose of restating it. We strive to provide accurate and relevant information, however:
  2. There is no guarantee of absolute accuracy. Wikipedia is an open, collaborative project that can be edited by anyone, so information is subject to change.
  3. It is not intended to constitute professional advice. The content displayed is for informational and educational purposes only. For important decisions (e.g., medical, legal, or financial), please consult a professional.
  4. Content copyright. Wikipedia is licensed under the Creative Commons Attribution-ShareAlike License (CC BY-SA). This means that content may be reused with appropriate attribution and shared under a similar license.
  5. Responsible use. Any risk arising from the use of information from this website is entirely the responsibility of the user.