Computer Science
Scientific paper
Jan 1994
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994gecoa..58...95b&link_type=abstract
Geochimica et Cosmochimica Acta, vol. 58, Issue 1, pp.95-112
Computer Science
5
Scientific paper
The Cretaceous Monteregian alkaline igneous province is composed of shallowly emplaced plutonic complexes, and cogenetic dykes and sills. The mafic dykes are principally camptonites, monchiquites and alnöites, and sample the magmas that fed the plutons. The three principal dyke suites have different incompatible trace element ratios ( Y / Ce , Zr / Nb ), and are not interrelated by closed-system fractional crystallization. Zonation of pyroxene grains imply a polybaric crystallization history, indicating that magmas ascended as mafic crystal-charged mushes. Intrasuite chemical variations among monchiquites are broadly consistent with segregation of the suspended phenocrysts from interstitial "syenitic" melts. Partial resorption of suspended amphibole megacrysts, assimilation of syenitic material (5-8%) and exsolution of carbonatitic melt are required to explain the variations of Ba, Rb, K 2 O, Th, La, and TiO 2 . Chemical variations among mafic camptonites are acceptably modelled by fractionation of pyroxene and olivine only, implying that their amphibole-rich character is the result of postfractionation crystallization under volatile-rich conditions. High- Zr / Nb camptonites and Rb-rich (AC) monchiquites could not unequivocably be linked to the main lineages and may represent distinct sources or have been affected by crustal contaminants.
No associations
LandOfFree
Mesozoic east North American alkaline magmatism: Part 1. Evolution of Monteregian lamprophyres, Québec, Canada does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.
If you have personal experience with Mesozoic east North American alkaline magmatism: Part 1. Evolution of Monteregian lamprophyres, Québec, Canada, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Mesozoic east North American alkaline magmatism: Part 1. Evolution of Monteregian lamprophyres, Québec, Canada will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-868916