Premium
Geochemical variation in the Penmaenmawr intrusion (North Wales)
Author(s) -
TREMLETT W. E.
Publication year - 1997
Publication title -
geological journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.721
H-Index - 54
eISSN - 1099-1034
pISSN - 0072-1050
DOI - 10.1002/(sici)1099-1034(199706)32:2<173::aid-gj738>3.0.co;2-t
Subject(s) - intrusion , variation (astronomy) , geology , geochemistry , physics , astrophysics
To determine the pattern of geochemical variation within the Penmaenmawr intrusion, 41 rocks were analysed for major oxides and 15 minor elements. The results indicate pulsational emplacement of sheets of magma from a parental body at depth undergoing crystallization differentiation. These sheets now strike NE–SW and dip southeastward. The resultant intrusion shows a range of SiO 2 contents from 57·3% to 65·6% (H 2 O‐free). Geochemical evidence suggests that it was derived from an intermediate parental magma and is possibly related to parts of the Conwy Rhyolite Formation. © 1997 John Wiley & Sons, Ltd.