On the deformation sequence in the New Harbour Group of Holy Island, Anglesey, North Wales
✍ Scribed by NEIL F. C. HUDSON; JULIA F. W. STOWELL
- Book ID
- 102658446
- Publisher
- John Wiley and Sons
- Year
- 1997
- Tongue
- English
- Weight
- 585 KB
- Volume
- 32
- Category
- Article
- ISSN
- 0072-1050
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✦ Synopsis
Four phases of deformation are recorded by minor structures in the New Harbour Group (NHG) of southern Holy Island. The regional schistosity in these rocks is a dierentiated crenulation cleavage of D 2 age. An earlier preferred orientation (S 1 ) is commonly preserved as crenulations within the Q-domain microlithons of the S 2 schistosity and is demonstrably non-parallel to bedding. F 3 folds are widely developed in S 2 and, to a lesser extent, in bedding. S 3 crenulation cleavage is sporadically developed but can be intense locally. A major antiformal fold exists in the NHG near Rhoscolyn. This fold is of D 3 age since it clearly deforms S 2 schistosity and is consistent with the vergence of F 3 minor structures. All planar structures are deformed by folds of D 4 age.