๐”– Bobbio Scriptorium
โœฆ   LIBER   โœฆ

Regional variations in cleavage and fold development in North Wales

โœ Scribed by S. D. G. Campbell; A. J. Reedman; M. F. Howells

Book ID
102845313
Publisher
John Wiley and Sons
Year
2007
Tongue
English
Weight
603 KB
Volume
20
Category
Article
ISSN
0072-1050

No coin nor oath required. For personal study only.

โœฆ Synopsis

The arcuate pattern of the main Caledonian cleavage and associated fold axial plane traces in North Wales is due partly to NW-SE compression with tectonic transport to rhe southeast against the concealed crop of the Tan y grisiau Microgranite. Low-angle cieavage close to the microgranite is shown to be a local variant of the regional cleavage formed during the main deformation and not an earlier phase as previously supposed. Transcurrent movements along several major fault systems are also related to compression around the microgranite and the Harlech Dome block.

KEY WORDS North Wales Cleavage Arcuation Concealed granite Faulring

2. The Tan y grisiau Microgranite

The Tan y grisiau Microgranite crops out over c. 4km' south of Blaenau Ffestiniog where it intrudes Upper Cambrian sediments. From a study of the

๐Ÿ“œ SIMILAR VOLUMES

Basin development in North Wales during
Basin development in North Wales during the Arenig
โœ A. J. Beckly ๐Ÿ“‚ Article ๐Ÿ“… 1987 ๐Ÿ› John Wiley and Sons ๐ŸŒ English โš– 736 KB

Refined biostratigraphy for the Arenig Series has permitted the use of the three stages recognized in South Wales, and hence the recognition of structurally-bounded areas of North Wales with substantially different depositional histories. During the Moridunian and Whitlandian, continuous subsidence

Slaty cleavage associated with sandstone
Slaty cleavage associated with sandstone dykes in the Harlech Dome, North Wales
โœ D. E. B. Bates ๐Ÿ“‚ Article ๐Ÿ“… 2007 ๐Ÿ› John Wiley and Sons ๐ŸŒ English โš– 866 KB

## Abstract Slaty cleavage in the Llanbedr Slates (Lower Cambrian, North Wales) is developed parallel to a number of sandstone and grit dykes, entrained both upwards and downwards from arenaceous layers. The implications of these observations are discussed and compared with modem and fossil analogu

Paleoproterozoic basin development and s
Paleoproterozoic basin development and sedimentation in the Lake Superior region, North America
โœ R.W. Ojakangas; G.B. Morey; D.L. Southwick ๐Ÿ“‚ Article ๐Ÿ“… 2001 ๐Ÿ› Elsevier Science ๐ŸŒ English โš– 968 KB

The peneplaned Archean craton in the Lake Superior region was the platform upon which a continental margin assemblage was deposited. Extension resulted in localized rifts that received thicker accumulations of sediments and volcanic rocks than did adjacent parts of the platform. Seas transgressed on