Abstract
Granulite facies metamorphic xenoliths have been found in several Monteregian-age lamprophyric dikes at Ayer9s Cliff, Quebec, Canada. From geothermobarometric calculations,it is shown that middle to lower crustal metapelitic assemblages formed at 700-800 °C and 8-10 kbar, whereas mafic assemblages formed near 1200 ±100 °C and 14 ±1 kbar. The metapelitic assemblages are interpreted as Cambrian metasediments similar to those found farther south in Vermont. The mafic assemblages are interpreted as Grenville basement. The occurrence of these lithologies at Ayer9s Cliff and in similar dikes in Vermont confirms the seismic interpretation of Grenville basement beneath a large part of the western Appalachians in southern Quebec and northern New England.
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.
