Hostname: page-component-78c5997874-xbtfd Total loading time: 0 Render date: 2024-11-20T00:56:55.624Z Has data issue: false hasContentIssue false
  • English
  • Français

Plateau lavas and diabase dikes of northwestern Newfoundland

Published online by Cambridge University Press:  01 May 2009

D. F. Strong
D. F. Strong
Affiliation:
Department of Geology, Memorial University of Newfounland, St John's, Newfoundland
Get access Rights & Permissions [Opens in a new window]

Summary

Thin undeformed tholeiitic plateau lavas and associated diabase dikes occur intermittently along the western margin of the Appalachian mountain system, and are clearly exposed at its northern extremity in northwestern Newfoundland. In Newfoundland there are consistent chemical differences between the diabase dikes and the plateau lavas which indicate that they were derived from different primary magmas. These differences, along with apparent age discrepancies, could be taken as supporting suggestions of several periods of continental rifting, but such an interpretation is not favoured by the present author.

Type
Articles
Information
Geological Magazine , Volume 111 , Issue 6 , November 1974 , pp. 501 - 514
Copyright
Copyright © Cambridge University Press 1974

Access options

Get access to the full version of this content by using one of the access options below. (Log in options will check for institutional or personal access. Content may require purchase if you do not have access.)

References

Bird, J. M. & Dewey, J. F. 1970. Lithosphere plate — continental margin tectonics and the evolution of the Appalachian Orogen. Bull. geol. Soc. Am. 81, 1031–60.CrossRefGoogle Scholar
Cann, J. R. 1970. Rubidium, Sr, Y, Zr, and Nb in some ocean floor basaltic rocks. Earth Planet. Sci. Lett. 10, 7–11.CrossRefGoogle Scholar
Dewey, J. F. & Bird, J. M. 1971. Origin and emplacement of the ophiolite suite: Appalachian Ophiolites in Newfoundland. J. Geophys. Res. 76, 3179–206.CrossRefGoogle Scholar
Green, D. H. 1971. The origin of basaltic and nephelinitic magmas in the Earth's mantle, Tectonophys. 7, 409–22.CrossRefGoogle Scholar
Green, D. H. & Ringwood, A. E. 1967. The genesis of basaltic magmas. Contr. Mineral. Petrol. 15, 103–90.CrossRefGoogle Scholar
Jolly, W. T. & Smith, R. E. 1972. Degradation and metamorphic differentiation of the Keweenawan tholeiitic lavas of Northern Michigan, U.S.A. J. Petrology 13, 273–310.CrossRefGoogle Scholar
Kay, R., Hubbard, N. J. & Gast, P. W. 1970. Chemical Charistics and origin of oceanic ridge volcanic rocks. J. Geophys. Res. 75, 1585–613.CrossRefGoogle Scholar
Kennedy, M. J. 1973. The relationship between pre-Ordivician polyphase deformation and ophiolite obduction in the Newfoundland Appalachian System. Geol. Soc. Am. Northeastern Sec. 8th Ann. Mtg Abstracts 5, 183.Google Scholar
Kuno, H. 1960. High-alumina basalt. J. Petrology 1, 121–45.CrossRefGoogle Scholar
Macdonald, G. A. & Katsura, T. 1964. Chemical composition of Hawaiian lavas. J. Petrology 5, 82–133.CrossRefGoogle Scholar
Manson, V. 1968. Geochemistry of basaltic rocks: major elements. In: Basalts: The Poldervaart Treatise on Rocks of Basaltic Composition, pp. 215–70. Interscience Publishers, New York.Google Scholar
O'Hara, M. J. 1968. The bearing of phase equilibria studies in synthetic and natural systems on the origin and evolution of basic and ultrabasic rocks. Earth-Sci. Rev. 4, 236–45.CrossRefGoogle Scholar
Pearce, J. A. & Cann, J. R. 1971. Ophiolite origin investigated by discrimination analysis using Ti, Zr and Y. E. Planet. Sci. Lett. 12, 339–49.CrossRefGoogle Scholar
Pringle, I. R., Miller, J. A. & Warrell, D. M. 1971. Radiometric age determinations from the Long Range Mountains, Newfoundland. Can. J. Earth Sci. 8, 1325–30.CrossRefGoogle Scholar
Prinz, M. 1967. Geochemistry of basaltic rocks: trace elements. In: Basalts: The Poldervaart Treatise on Rocks of Basaltic Composition, pp. 271–323. Interscience Publishers, New York.Google Scholar
Reed, J. C. & Morgan, B. 1971. Chemical alteration and spilitization of the Catoctin greenstones, Shenandoah National Park, Virginia. J. Geol. 79, 526–48.CrossRefGoogle Scholar
Strong, D. F. 1972. The petrology of the lavas of Grande Comore. J. Petrology 13, 181–217.CrossRefGoogle Scholar
Strong, D. F. & Williams, H. 1972. Early Paleozoic flood basalts of Northwestern Newfoundland: their petrology and tectonic significance. Proc. Geol. Assoc. Canada 24, 43–54.Google Scholar
Wanless, R. K., Stevens, R. D., Lachance, G. R. & Rimsaits, J. Y. H. 1966. Age determinations and geological studies. K-Ar isotope ages. Report 6; Geol. Surv. Can; Paper 65–17.Google Scholar
Williams, H. & Stevens, R. K. 1969. Geology of Belle Isle — northern extremity of the deformed Appalachian miogeosynclinical belt. Can. J. Earth. Sci. 6, 1145–1157.CrossRefGoogle Scholar
Wright, T. L., Grolier, M. J. & Swanson, D. A. 1973. Chemical variation related to the stratigraphy of the Columbia River Basalt. Bull. geol. Soc. Am. 84, 371–86.2.0.CO;2>CrossRefGoogle Scholar
Brown, G. M. 1967. Mineralogy of basaltic rocks. In: Hess, H. H. (Ed.): Basalts: The Poldervaart Treatise on Rocks of Basaltic Composition, pp. 103–62. Interscience, New York.Google Scholar
Murray, R. J. 1954. The clinopyroxenes of the Garbh Eilean sill, Shiant Isles. Geol. Mag. 91, 17–31.CrossRefGoogle Scholar
Wilkinson, F. J. G. 1956. Clinopyroxenes of alkali olivine-basalt magma. Am. Miner. 41, 724–43.Google Scholar