Abstract
Anomalous enrichments of Zr (>500 ppm), Zn (> 100 ppm), Nb (>25 ppm), Y (>60 ppm), Th (>20 pm), U (> 5 ppm), LREE (>230 ppm) and HREE (>35ppm), and high Rb/Sr (>5) characterize peralkaline granites, in contrast to their peraluminous and calc-alkaline equivalents. Within the peralkaline suite, comenditic and pantelleritic volcanics exhibit two- to five-fold increases in the concentrations of these trace elements over comagmatic granites. These cannot be explained by crystal- liquid fractionation processes, and require the evolution of a sodium-enriched fluid. Corresponding trace element increases in the granites in areas of alkali metasomatism support this argument, and reflect the partial confinement of this volatile phase within the high-level magma chambers. REE studies in particular might eventually allow an evaluation of the role of Cl− versus F− and CO3-complexing in the evolution of the volatile fluid.
Article PDF
Similar content being viewed by others
Avoid common mistakes on your manuscript.
References
Bailey DK (1978) Continental Rifting and Mantle Degassing. In: ER Neumann and IB Ramberg (eds) Petrology and geochemistry of continental rifts, pp 1–13. Reidel, Holland
Bailey DK (1980) Volcanism, earth degassing and replenished lithosphere mantle. Philos Trans R Soc London A297:309–322
Bailey DK, MacDonald R (1975) Fluorine and chlorine in peralkaline liquids and the need for magma generation in an open system. Mineral Mag 40:405–414
Balashov YA, Kligman LD (1975) The effects of alkalinity and volatiles on rare-earth separation in magmatic systems. Geokhimiya 12:1885–1890 (translation pp 165–170)
Bell K, Blenkinsop J (1981) A geochronological study of the Buchans area, Newfoundland. Geol Assoc Can, Spec Pap pp 91–112
Bonin B, Orsini CG, Vialette Y (1978) Age, Origin and Evolution of the Anorogenic Complex of Evisa (Corsica): A K-Li-Rb-Sr Study. Contrib Minerol Petrol 65:425–432
Flynn RT, Burnham CW (1978) An experimental determination of rare earth partition coefficients between a chloride-containing vapor phase and silicate melts. Geochim Cosmochim Acta 42 (6A): 679–684
Fryer BJ (1977) Rare-earth evidence in iron-formations for changing Precambrian oxidation states. Geochim Cosmochim Acta 41:361–367
Green HW (1979) Trace elements in the fluid phase of the Earth's mantle. Nature 277:465–467
Kerrich R, Fryer BJ (1979) Archean precious-metal hydrothermal systems, Dome mine. Abitibi greenstone belt II. REE and oxygen isotope relations. Can J Earth Sci 16:440–458
Kosterin AV (1959) The possible modes of transport of the rare earths by hydrothermal solutions. Geochemistry pp 381–387
Langmuir D (1978) Uranium solution-mineral equilibria at low temperatures with applications to sedimentary ore deposits. Geochim Cosmochim Acta 42:547–560
Martin RF (1974) Role of water in pantellerite genesis. Bull Volcanol 38:3
McLennan SM, Taylor SR (1980) Rare earth elements in sedimentary rocks, granites and uranium deposits of the Pine Creek geosyncline. Proc Intl Uranium Symp on the Pine Creek Geosyncline, 1980, pp 175–190. I A E A Vienna
Mineyev DA (1963) Geochemical Differentiation of the rare earths. Geokhimiya 12:1082–1100
Neumann E-R, Brunfelt AD, Finstad KG (1977) Rare earth elements in some igneous rocks in the Oslo Rift, Norway. Lithos 10:311–319
Roedder EH, Coombs DS (1968) Immiscibility in granitic melts, indicated by fluid inclusions in ejected granitic blocks from Ascension island. J Petrol 8:417–452
Schuiling RD, Kruelen R (1979) Are thermal domes heated by CO2-rich fluids from the melts? Earth Planet Sci Lett 43:298–302
Strong DF (1977) Volcanic Regimes in the Newfoundland Appalachians, In: WRA Baragar, LC Coleman, JM Hall (eds) Volcanic regimes in Canada, pp 61–90. Geol Assoc Can Spec Pap 16
Strong DF (1980a) Granitoid rocks and associated mineral deposits of eastern Canada and western Europe. D Strangway (ed). Geol Assoc Can, Spec Pap 20:741–769
Strong DF (1980b) Origin of granitoid rocks — after the oceans closed. GEOS, Spring, 1980, pp 14–17
Taylor RP, Fryer BJ (1980) Multiple-stage hydrothermal alteration in porphyry copper systems in northern Turkey: the temporal inter-play of potassic, propylitic and phyllic fluids. Can J Earth Sci 17:901–926
Taylor RP, Strong DF, Kean BF (1980) The Topsails igneous complex: Silurian-Devonian peralkaline magmatism in western Newfoundland. Can J Earth Sci 17:425–439
Thurlow JG (1981) Geology of the Buchans area. FA Swanson, JG Thurlow, DF Strong (eds.). Geol Assoc Can, Spec Pap No 22 pp 79–90
Williams H (1978) Tectonic lithofacies map of the Appalachians. Memorial University of Newfoundland.
Wyllie PJ, Huang WE (1975) Peridotite, Kimberlite, and carbonatite explained in the system CaO-MgO-SiO2-CO2 Geology 3, 621–624
Author information
Authors and Affiliations
Rights and permissions
About this article
Cite this article
Taylor, R.P., Strong, D.F. & Fryer, B.J. Volatile control of contrasting trace element distributions in peralkaline granitic and volcanic rocks. Contr. Mineral. and Petrol. 77, 267–271 (1981). https://doi.org/10.1007/BF00373542
Accepted:
Issue Date:
DOI: https://doi.org/10.1007/BF00373542