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Primative nephelinitic volcanism associated with rifting and uplift in the Canadian Arctic
OLR (1983) 30 (12)
D. Submarine Geology and Geophysics
Nature, Lond., 303(5919):694-696. Ist. di Geofisica, Viale Berti Pichat, 8 Univ. di Bologna, 40127, Italy.
D280. Volcanism, magmatism 83:6755 Almukhamedov, A.I., E.V. Smirnova, V.V. Konusova, V.V. Matveenkov and G.L. Kashintsev, 1983. Rare-earth elements in tholeiite basalts of the Red Sea axial zone. Dokl. Akad. Nauk SSSR, 269(6):1463-1466. (In Russian.) 83:6756 Dostal, J., C. Dupuy and J.M. Liotard, 1982. Geochemistry and origin of basaltic lavas from Society Islands, French Polynesia (south-central Pacific Ocean). Bull. volcan., 45(1):51-62. Dept. of Geol., Saint Mary's Univ., Halifax, Nova Scotia, Canada. 83:6757 Elthon, Don, 1983. Isomolar and isostrucmrai pseudo-liquidus phase diagrams for oceanic basalts. Am. Mineralogist, 68(5/6):506-511. Dept. of Geosci., Univ. of Houston, Tex. 77004, USA.
83:6758 Innocenti, F., N. Kolios, P. Manetti, F. Rita and L. Villari, 1982. Acid and basic Late Neogene volcanism in the central Aegean Sea: its nature and geotectonic significance. Bull. volcan., 45(2): 87-97. Rhyolites outcrop on Antiparos and range in age from 4.0-5.4 m.y.; chemical and Sr isotopic data suggest generation by partial melting of continental crust. At the same time, on Patmos and Caloyeri, local eruptions of Na-alkaline basalts occurred. Volcanism is attributed to the marked tensional tectonic phase which has affected the central Aegean since the Middle Miocene. Dipt. di Scienze della Terra, Univ. di Pisa, Italy.
83:6759 Mitchell, R.H. and R.G. Platt, 1983. Primitive nephelinitic volcanism associated with rifting and uplift in the Canadian Arctic. Nature, Lond., 303(5918): 609-612.
925
The Eocene Freemans Cove volcanic suite is identified as an example of continental-rifting type intraplate magmatism. Geochemical analysis suggests that the saturated to undersaturated suite's partial melts were derived from metasomatized mantle. Dept. of Geol., Lakehead Univ., Thunder Bay, Ont. P7B 5El, Canada. (bas)
83:6760 Pecherskii, D.M. and L.V. Tikhonov, 1982. Low temperature heterophase alteration of titanomagnetite in oceanic basalts based on magnetic data. Phys. solid Earth (a translation of Fiz. Zemli), 18(7):506-513. Schmidt Inst. of Earth Physics, Acad. of Sci., Moscow, USSR.
83:6761 Rock, N.M.S., H.H. Syah, A.E. Davis, D. Hutchison, M.T. Styles and Rahayu Lena, 1982. Permian to Recent volcanism in northern Sumatra, Indonesia: a preliminary study of its distribution, chemistry, and peculiarities. Bull. volcan., 45(2): 127-152. Field and laboratory data on Sumatra volcanics are reported. Five volcanic episodes occurred in the area from the Late Permian to the Quaternary. Results are compared with data from the better studied, neighboring Java/Bali area. Inst. of Geol. Sci., West Mains Rd., Edinburgh EH9 3LA, Scotland. (bas)
83:6762 Rosencrantz, Eric, 1983. The structure of sheeted dikes and associated rocks in North Arm massif, Bay of Islands ophiolite complex, and the intrusive process at oceanic spreading centers. Can. J. Earth Sci., 20(5):787-801. The structures of ophiolitic basalt and diabase indicate formation as a frozen lid to an underlying magma chamber in a system analogous to presentday mid-ocean spreading systems. Volcanics (pillow lavas, flows, breccias) grade downward into sheeted dikes which dip away from the paleospreading axis. One-way chilling statistics, dike thickness, and dike intrusion sequence analyses indicate a relatively narrow but complex zone of dike intrusion. Diabase contains zones of fracturing subparallel to dike trends, interpreted to reflect oceanic fissuring and faulting. Diabase grades into gabbros across a complex transition. Inst. for Geophys., Univ. of Texas, P.O. Box 7456, Univ. Sta., Austin, Tex. 78712, USA.
D. Submarine Geology and Geophysics
Nature, Lond., 303(5919):694-696. Ist. di Geofisica, Viale Berti Pichat, 8 Univ. di Bologna, 40127, Italy.
D280. Volcanism, magmatism 83:6755 Almukhamedov, A.I., E.V. Smirnova, V.V. Konusova, V.V. Matveenkov and G.L. Kashintsev, 1983. Rare-earth elements in tholeiite basalts of the Red Sea axial zone. Dokl. Akad. Nauk SSSR, 269(6):1463-1466. (In Russian.) 83:6756 Dostal, J., C. Dupuy and J.M. Liotard, 1982. Geochemistry and origin of basaltic lavas from Society Islands, French Polynesia (south-central Pacific Ocean). Bull. volcan., 45(1):51-62. Dept. of Geol., Saint Mary's Univ., Halifax, Nova Scotia, Canada. 83:6757 Elthon, Don, 1983. Isomolar and isostrucmrai pseudo-liquidus phase diagrams for oceanic basalts. Am. Mineralogist, 68(5/6):506-511. Dept. of Geosci., Univ. of Houston, Tex. 77004, USA.
83:6758 Innocenti, F., N. Kolios, P. Manetti, F. Rita and L. Villari, 1982. Acid and basic Late Neogene volcanism in the central Aegean Sea: its nature and geotectonic significance. Bull. volcan., 45(2): 87-97. Rhyolites outcrop on Antiparos and range in age from 4.0-5.4 m.y.; chemical and Sr isotopic data suggest generation by partial melting of continental crust. At the same time, on Patmos and Caloyeri, local eruptions of Na-alkaline basalts occurred. Volcanism is attributed to the marked tensional tectonic phase which has affected the central Aegean since the Middle Miocene. Dipt. di Scienze della Terra, Univ. di Pisa, Italy.
83:6759 Mitchell, R.H. and R.G. Platt, 1983. Primitive nephelinitic volcanism associated with rifting and uplift in the Canadian Arctic. Nature, Lond., 303(5918): 609-612.
925
The Eocene Freemans Cove volcanic suite is identified as an example of continental-rifting type intraplate magmatism. Geochemical analysis suggests that the saturated to undersaturated suite's partial melts were derived from metasomatized mantle. Dept. of Geol., Lakehead Univ., Thunder Bay, Ont. P7B 5El, Canada. (bas)
83:6760 Pecherskii, D.M. and L.V. Tikhonov, 1982. Low temperature heterophase alteration of titanomagnetite in oceanic basalts based on magnetic data. Phys. solid Earth (a translation of Fiz. Zemli), 18(7):506-513. Schmidt Inst. of Earth Physics, Acad. of Sci., Moscow, USSR.
83:6761 Rock, N.M.S., H.H. Syah, A.E. Davis, D. Hutchison, M.T. Styles and Rahayu Lena, 1982. Permian to Recent volcanism in northern Sumatra, Indonesia: a preliminary study of its distribution, chemistry, and peculiarities. Bull. volcan., 45(2): 127-152. Field and laboratory data on Sumatra volcanics are reported. Five volcanic episodes occurred in the area from the Late Permian to the Quaternary. Results are compared with data from the better studied, neighboring Java/Bali area. Inst. of Geol. Sci., West Mains Rd., Edinburgh EH9 3LA, Scotland. (bas)
83:6762 Rosencrantz, Eric, 1983. The structure of sheeted dikes and associated rocks in North Arm massif, Bay of Islands ophiolite complex, and the intrusive process at oceanic spreading centers. Can. J. Earth Sci., 20(5):787-801. The structures of ophiolitic basalt and diabase indicate formation as a frozen lid to an underlying magma chamber in a system analogous to presentday mid-ocean spreading systems. Volcanics (pillow lavas, flows, breccias) grade downward into sheeted dikes which dip away from the paleospreading axis. One-way chilling statistics, dike thickness, and dike intrusion sequence analyses indicate a relatively narrow but complex zone of dike intrusion. Diabase contains zones of fracturing subparallel to dike trends, interpreted to reflect oceanic fissuring and faulting. Diabase grades into gabbros across a complex transition. Inst. for Geophys., Univ. of Texas, P.O. Box 7456, Univ. Sta., Austin, Tex. 78712, USA.