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- W2328201620 abstract "The Monteregian Hills petrographic province of southwestern Quebec, Canada, consists of a series of alkaline intrusions emplaced along faults associated with the St. Lawrence graben. The intrusions are crudely cylindrical in shape, show vertical contacts, and apparently extend to great depths. Where observed, igneous foliation is generally steeply dipping. The western intrusions consist of two petrographically distinct groups. One group is composed of slightly undersaturated to critically saturated pyroxenites and gabbros, largely of cumulate origin, and associated slightly quartz-saturated syenites. The second group is composed of strongly to moderately undersaturated diorites, monzonites, and syenites which contain significant amounts of feldspathoidal minerals. The Oka carbonatite complex belongs to the latter group. Available age data indicate that these two petrographic groups represent separate periods of igneous activity. The slightly undersaturated to critically saturated series has a mean age of 136 Ma, while the strongly to moderately undersaturated series has a mean age of 118 Ma. Mounts Royal and St. Bruno are largely composed of gabbros and pyroxenites which belong to the slightly undersaturated to critically saturated series. These units consist of variable amounts of cumulus pyroxene and olivine and intercumulus minerals. Some of the finer-grained gabbros approximate liquid compositions. Major and trace element rock and mineral chemistry demonstrate that the evolution of these magmas was largely controlled by pyroxene and olivine fractionation, with plagioclase appearing on the liquidus late in the crystallization history. The quartz-bearing syenites at Mt. St. Bruno represent a late stage differentiate which was contaminated by siliceous crustal material. The strongly to moderately undersaturated series is represented by the essexites and pulaskites at Mount Johnson and the nepheline-bearing diorites and feldspathoidal monzonites and syenites at Mount Royal. The petrogenetic relationships between these rocks are complex and apparently involve a number of processes including liquid immiscibility, contamination, and alkali transport. Low initial Sr isotope ratios (0.7032 to 0.7035) for both of these rock series indicate a mantle origin. Calculated initial melts are alkali picrites for the slightly undersaturated to critically saturated series and basanites for the strongly to moderately undersaturated series. The alkali picrites can be produced by an 8 per cent melt of a light rare-earth enriched garnet lherzolite source. The basanites require a much more limited degree of melting (1–2 per cent) of a spinel lherzolite source. In the case of the basanites, CO2 may have played an important role in determining the nepheline-normative character of the magmas." @default.
- W2328201620 created "2016-06-24" @default.
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- W2328201620 date "1984-01-01" @default.
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- W2328201620 title "Monteregian Hills I. Petrography, Major and Trace Element Geochemistry, and Strontium Isotopic Chemistry of The Western Intrusions: Mounts Royal, St. Bruno, and Johnson" @default.
- W2328201620 doi "https://doi.org/10.1093/petrology/25.2.421" @default.
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