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Origin of Foliation in the Barrington Passage Pluton
(1991-04-15)
New studies provide insight into the processes producing the penetrative foliation observed in the Barrington Passage Pluton (BPP). Preferred alignment of primary minerals, imbrication of feldspars, preferred alignment of ...
The Petrochemistry and Origin of the Bourne Complex, Northwestern Ellesmere Island, Canada
(1991-04-15)
New petrological and petrochemical analyses provide insight into the origin of the hypabyssal and volcanic rocks of the Bourne Complex, northwestern Ellesmere Island, Canada. Field relationships and petrographic characteristics ...
Correlation and 40Ar/39Ar Age Dating of the Early Cretaceous Walker Island Member Basalts Axel Heiberg Island - Canadian Arctic
(1991-04-15)
Previous studies have documented the presence of magnetic polarity reversals, which could represent the earliest M0 or M1 reversal of the M-Sequence, in the Early Cretaceous (Aptian-Barremian) sedimentary/volcanic stratigraphic ...
Muscovite 40Ar/39Ar Geochronology of the Western Parry Sound and Britt Domains, Central Gneiss Belt, Grenville Province
(1991-04-15)
40Ar/39Ar analysis of ten muscovite samples from the western Central Gneiss Belt, Grenville Province, Ontario, yielded good argon spectra. The ages calculated show a trend of decreasing age southward into the orogenic ...
Seismic Stratigraphy of the Exmouth Plateau
(1991-04-15)
The Barrow Group deltaic sediments of the Exmouth Plateau were mapped with forty seismic lines and data from five wells. The mapping shows two deltaic sequences which are separated by a flooding surface. The source areas ...
Genesis of the Volcan Copiapo Sulphur Deposits, Maricunga District, Chile
(1991-04-15)
The Miocene age Copiapo Volcanic Complex is located in the heart of the Maricunga gold mining district in the southernmost part (Latitude 27oS) of the Andean Central Volcanic Zone. The largest cone in this complex, Volcan ...