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Article: Petrochemical evolution of subvolcanic granitoid intrusions within the late Devonian Mount Pleasant Caldera, southwestern New Brunswick, Canada: comparison of Au versus Sn-W-Mo-polymetallic mineralization systems.
- Article from:
- Atlantic Geology
- Article date:
- July 1, 2003
- Author:
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Copyright informationCOPYRIGHT 2003 Atlantic Geoscience Society. This material is published under license from the publisher through the Gale Group, Farmington Hills, Michigan. All inquiries regarding rights should be directed to the Gale Group. (Hide copyright information)
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ABSTRACT
Two spatially and temporally related subvolcanic intrusive suites, the McDougall Brook Granitic Suite (MBG) and the Mount Pleasant Granitic Suite (MPG), occur within the Late Devonian Mount Pleasant Caldera, southwestern New Brunswick. Auriferous greisenized quartz breccias and veins are associated with the MBG, whereas Sn-W-Mo-Bi-polymetallic (Cu-Zn-Pb-In) mineralization is generically related to the slightly younger MPG. The low silica (
<70 wt. %) MBG and the high-silica (> 74 wt. %) MPG are calc-alkaline and metaluminous to weakly peraluminous (A/CNK = 0.91 - 1.28), and exhibit some crustal A-type granite affinities. However, compared to the MPG, the MBG has lower amounts of incompatible trace ...
<70% pds) et la MBG a forte teneur en silice (>
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