Abstract
The Berlins Porphyry consists of many shallow intrusive igneous bodies emplaced c. 110–112 Ma over an area of c. 140 km2 near Westport. There is little variation in bulk chemistry or mineralogy, but texturally the rocks range from glassy dacite (hyalodacite) to granodiorite. Evidence suggests a two-stage model for emplacement – first, explosive brecciation of the country rock and mixing with fluidised, volatile-rich magma to form hyalodacite, followed by less vigorous emplacement of magma to form plutons that crystallised to microgranodiorite and granodiorite.
Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
