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Strontium 87/strontium 86 initial ratios in pyroxene granulite terranes

1970; American Geophysical Union; Volume: 75; Issue: 32 Linguagem: Italiano

10.1029/jb075i032p06706

2156-2202

Charles M. Spooner, H. W. Fairbairn,

Geochemistry and Geologic Mapping

Journal of Geophysical Research (1896-1977)Volume 75, Issue 32 p. 6706-6713 Strontium 87/strontium 86 initial ratios in pyroxene granulite terranes C. M. Spooner, C. M. SpoonerSearch for more papers by this authorH. W. Fairbairn, H. W. FairbairnSearch for more papers by this author C. M. Spooner, C. M. SpoonerSearch for more papers by this authorH. W. Fairbairn, H. W. FairbairnSearch for more papers by this author First published: 10 November 1970 https://doi.org/10.1029/JB075i032p06706Citations: 57AboutPDF ToolsRequest permissionExport citationAdd to favoritesTrack citation ShareShare Give accessShare full text accessShare full-text accessPlease review our Terms and Conditions of Use and check box below to share full-text version of article.I have read and accept the Wiley Online Library Terms and Conditions of UseShareable LinkUse the link below to share a full-text version of this article with your friends and colleagues. Learn more.Copy URL Abstract Rb-Sr isotopic analyses of granulite facies rocks from East Africa, India, Guyana, the Adirondacks (New York), and southeastern Ontario give regression plots that restrict initial Sr87/Sr86 to a narrow range 0.700–0.707, comparable with anorthosite and continental basalt. The ratios agree with published values for granulite from India, Scotland, and Ivory Coast. Both geophysical and geochemical evidence suggest that these rocks developed in the lower crust and that most of the examples investigated were of igneous origin. Although subsequent regional metamorphism at the granulite facies level may have rearranged the assemblages, initial Sr87/Sr86 has been unaffected. References Aswathanarayana, U., Precambrian geochronology of peninsular India and Ceylon: An interpretation, Bull Geol. Soc. India., 5, 43– 51, 1968. Birch, B., Interpretation of the seismic structure of the crust in the light of experimental studies of wave velocities in rocks, Contributions in Geophysics in Honor of Beno Gutenberg H. Benioff, M. Ewing, B. Howell, F. Press, 158, Pergamon, New York, 1958. Birch, F., The Vp in rocks to 10 kb, J. Geophys. Res., 66, 2199– 2224, 1961. Buddington, A. F., Adirondack igneous rocks and their metamorphism, Geol. Soc. Amer. Mem., 7, 345, 1939. Christensen, N. I., Compressional wave velocities in metamorphic rocks at pressures to 10 kb, J. Geophys. Res., 70, 6147– 6164, 1965. Compston, W., R. T. Pidgeon, Rubidiumstrontium dating of shales by the total-rock method, J. Geophys. Res., 67, 3493– 3501, 1962. Crawford, A. R., Geochronology of Precambrian rocks of peninsular India and Ceylon, Ph.D. thesis,Australian National University,Canberra,1968. deWaard, D., The biotite-cordierite-almandite subfacies of the hornblende-granulite facies, Can. Mineral., 8, 481– 492, 1966. deWaard, D., The problem of the anorthositecharnockite suite of rocks, Origin of Anorthosite and Related Rocks, N. Y. State Mus, Mem., 18 Y. W. Isachsen, 71, State Education Department, New York University, Albany, 1969. Evans, C. R., Geochronology of the Lewisian basement near Lochinver, Sutherland, Nature, 207, 54– 56, 1965. Ewart, A., J. J. Stipp, Petrogenesis of the volcanic rocks of the North Central Island, New Zealand, Geochim. Cosmochim. Acta., 32, 699– 736, 1968. Fairbairn, H. W., P. M. Hurley, W. H. Pinson, Initial Sr87/Sr86 and possible sources of granitic rocks in southern British Columbia, J. Geophys. Res., 69, 4889– 4893, 1964. Faure, G., P. M. Hurley, The isotopic composition of strontium in oceanic and continental basalts: Application to the origin of igneous rocks, J. Petrol, 4, 31, 1963. Green, D. H., I. B. Lambert, Experimental crystallization of anhydrous granite at high pressures and temperatures, J. Geophys. Res., 70, 5259– 5268, 1965. Green, T. H., High pressure experimental studies relevant to the nature of the lower crust, Can. J. Earth. Sci., 6, 427, 1969. Griffin, W., K. S. Heier, Parageneses of garnet in granulite facies rocks, Lofoten-Vesteraalen, Norway, Contrib. Mineral. Petrol., 23, 89– 116, 1969. Gutenberg, B., Wave velocities in the earth's crust, Crust of the Earth, Geol. Soc. Amer. Spec. Pap., 62 A. Poldervaart, 19, 1955. Gutenberg, B., Physics of the Earth's Interior, 1, Academic, New York, 1959. Heath, S. A., H. W. Fairbairn, Sr87/Sr86 ratios in anorthosites and some associated rocks, Origin of Anorthosite and Related Rocks, N.Y. State Mus, Mem., 18 Y. W. Isachsen, 99, State Education Department, New York University, Albany, 1969. Hedge, C. E., F. G, Walthall, Radiogenic strontium 87 as an index of geologic processes, Science, 140, 1214, 1963. Heier, K. S., Rubdium/strontium and strontium 87/strontium 86 ratios in deep crustal material, Nature, 202, 477, 1964. Heier, K. S., C. Brooks, Geochemistry and the genesis of the Heemskirk granite, west Tasmania, Geochim. Cosmochim. Acta, 30, 633– 643, 1966. Hepworth, J. V., Explanation of the geology of sheets 19, 20, 28, and 29 (southern West Nile)Geol. Surv. Uganda, Rep. 10, 110, 1964. Holland, T. H., The charnockite series, a group of hypersthenic rocks from peninsular India, Mem. Geol. Surv. India, 28, 158, 1900. Howie, R. A., The geochemistry of the charnockite series of Madras, India, Trans. Roy. Soc. Edinburg, 62, 725– 768, 1955. Hurley, P. M., H. Huges, G. Faure, H. W. Fairbairn, W. H. Pinson, Radiogenic strontium 87 model of continental formation, J. Geophys. Res., 67, 5315– 5334, 1962. Papon, A., M. Roques, M. Vachette, Âge de 2700 millions d'années, déterminé par la méthode au strontium, pour la série charnockitique de Man, en Cote d'Ivoire, Comptes Rendus, 266, 2046– 2048, 1968. Peterman, Z. E., C. E. Hedge, R. G. Coleman, P. D. Snavely Jr., Sr87/Sr86 ratios in some eugeosynclinal sedimentary rocks and their bearing on the origin of granitic magma in orogenic belts, Earth Planet. Sci. Lett., 2, 433– 439, 1967. Reesman, R. H., A rubidium-strontium isotopic investigation of the possibility of dating hydrothermal mineral deposits, Ph.D. thesis,Massachusetts Institute of Technology,1968. Ringwood, A. E., D. H. Green, Petrological nature of the stable continental crust, The Earth beneath the Continents, Geophys. Monogr., 10 J. S. Steinhart, T. J. Smith, 611, AGU, Washington, D. C., 1966. Singh, S., Orthopyroxene-bearing rocks of charnockitic affinities in the South Savanna Kanuku complex of British Guiana, J. Petrol., 72, 171– 194, 1966. Spooner, C. M., Sr87/86 initial ratios, K/Rb ratios, and rare-earth element abundances in pyroxene granulities, Ph.D. thesis,Massachusetts Institute of Technology,1969. Whitney, P. R., P. M. Hurley, The problem of inherited radiogenic strontium in sedimentary age determinations, Geochim. Cosmochim. Acta, 28, 425, 1964. Williams, E., R. T. Cannon, R. B. McConnell, The folded Precambrian of Northern Guyana related to the geology of the Guiana shieldGeol. Surv. Guyana Rec. 5, 43, 1967. Wynne-Edwards, H. R., Westport map area, Ontario, with special emphasis on the Precambrian rocks, Geol Sur. Can. Mem., 346, 142, 1967. Yoder Jr., H. S., Experimental studies bearing on the origin of anorthosite, Origin of Anorthosite and Related Rocks, N.Y. State Mus., Mem., 18 Y. W. Isachsen, 13, State Education Department, New York University, Albany, 1969. York, D., Least-squares fitting of a straight line, Can. J. Phys., 44, 1079– 1086, 1966. Citing Literature Volume75, Issue3210 November 1970Pages 6706-6713 ReferencesRelatedInformation