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Geochemical variation in the Penmaenmawr intrusion (North Wales)

✍ Scribed by W. E. TREMLETT

Book ID: 101281681
Publisher: John Wiley and Sons
Year: 1997
Tongue: English
Weight: 288 KB
Volume: 32
Category: Article
ISSN: 0072-1050
DOI: 10.1002/(sici)1099-1034(199706)32:2<173::aid-gj738>3.0.co;2-t

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✦ Synopsis

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 dierentiation. 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.

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