Abstract
Ejected plutonic blocks from the Soufrière volcano, St. Vincent, consist of the mineral phases plagioclase (An96−An89, average An93), olivine (Fo79−Fo67, most frequent interval Fo74−72), salite containing 5–6 percent Al2O3, hastingsitic amphibole and magnetite containing 6% Al2O3, 4% MgO and 7% TiO2.
Aluminous salitic pyroxenes are not confined to alkaline suites but also occur as high temperature phases in certain calc-alkaline suites. Similarly low silica amphiboles with comparatively high Fe+3+Ti contents are unusual in common sub-alkaline rocks. Magnetite in the St. Vincent blocks is an example of a single homogeneous iron oxide phase precipitated in equilibrium with the other four phases in the blocks.
Conditions of crystallisation are just as important as silica activity in determining the compositions of phases separating from basaltic magmas at relatively shallow depths (P tot< 8 kb). It is argued mainly on crystal chemical grounds that the mineral assemblage in the St. Vincent blocks can crystalline from a sub-alkaline magma under conditions of relatively high temperature, high water vapor pressure, and oxygen fugacity.
Similar content being viewed by others
References
Akimoto, S.: Magnetic properties of ferromagnetic minerals contained in igneous rocks. Japan J. Geophys. 1, 1–31 (1955).
Akimoto, S., Katsura, T.: Magneto-chemical study of the generalised titanomagnetite in volcanic rocks. J. Geomag. Geolect. 10, 69–90 (1959).
Aoki, K.: The kaersutites and oxykaersutites from alkalic rocks of Japan and surrounding areas. J. Petrol. 4, 198–210 (1963).
Basta, E.Z.: Natural and synthetic titanomagnetites. Neues Jahrb. Mineral. Abhandl. 94, 1017–48 (1960).
Berman, H.: Constitution and classification of the natural silicates. Am. Mineralogist 22, 342–415 (1937).
Binns, R. A.: The mineralogy of metamorphosed basic rocks from the Willyama complex Broken Hill district, New South Wales. Pt. II. Pyroxenes, garnets, plagioclases and opaque oxides. Mineral. Mag. 35, 561–87 (1965).
Bloxam, T. W., Allen, J. G.: Glaucophane-schist, eclogite and associated rocks from Knocknormal in the Girvan-Ballantrae complex, south Ayrshire. Trans. Roy. Soc. Edinburgh 74, 1–27 (1960).
Boyd, F. R., England J. L.: Melting of silicates at high pressures. Yearbook Carnegie Instn. Wash. 60, 113–25 (1961).
Brown, G. M.: The layered ultrabasic rocks of Rhum, Inner Hebrides. Phil. Trans. Roy. Soc. (London), Ser. B 240, 1–53 (1956).
Brown, G. M., Vincent, E. A.: Pyroxenes from the late stages of fractionation of the Skaergaard intrusion, east Greenland. J. Petrol. 4, 175–97 (1964).
Brown, G. M.: Mineralogy of basaltic rocks. In: Basalts: the Poldervaart Treatise on rocks of volcanic composition. Ed. H. H. Hess, Arie Poldervaart. Vol. 1, 1967.
Buddington, A. F., Lindsley, D. H.: Iron-titanium oxide minerals and synthetic equivalents. J. Petrol. 5, 310–57 (1964).
Carmichael, I. S. E., Nicholls, J.: Iron-titanium oxides and oxygen fugacities in volcanic rocks. J. Geophys. Res. 72, 4665–87 (1967).
Chayes, F.: Alkaline and sub-alkaline basalts. Am. J. Sci. 26, 128–45 (1966).
Clark, S. P., Jr., Schairer, J. F., DeNeufville, J.: Phase relations in the system CaMgSi2O6-CaAl2 SiO6-SiO2 at low and high pressure. Yearbook Carnegie Instn. Wash. 61, 59–68 (1962).
Deer, W. A.: The composition and paragenesis of the hornblendes of the Glen Tilt complex, Perthshire. Mineral. Mag. 25, 56–74 (1938).
Deer, W. A. Howie, R. A., Zussman, J.: Rock forming minerals, vol. 2. 379 p. Chain silicates. London: Green & Co. Ltd. 1963.
Engel, C. G.: Igneous rocks and constituent hornblendes of the Henry Mountains, Utah. Geol. Soc. Amer. Bull. 70, 951–980 (1959).
Flett, J. S.: Petrographical notes on the products of the eruptions of May, 1902, at the Soufrière in St. Vincent. Phil. Trans. Roy. Soc. London, Ser. A. 208, 305–32 (1908).
Green, T. H., Ringwood, A. E.: Genesis of the calc-alkaline igneous rock suite. Contr. Mineral. and Petrol. 18, 105–62 (1968).
Harry, W. T.: Aluminium replacing silicon in some silicate lattices. Mineral. Mag. 29, 142 (1950).
Heckroodt, R. O.: An X-ray method for the determination of olivine. Trans. Geol. Soc. Africa 61, 377–86 (1958).
Hess, H. H.: Chemical composition and optical properties of common clinopyroxenes. Am. Mineralogist 34, 621–666 (1949).
Hess, H. H.: Orthopyroxenes of the Bushveld type, ion substitutions and changes in unit cell dimensions. Amer. J. Sci. Bowen volume, 173–87 (1949).
Hess, H. H. Stillwater igneous complex, Montana. Mem. Geol. Soc. Am. 80, 230 (1960).
Hotz, P. E., Jackson, E. D.: X-ray determinative curve for olivines of composition Fo80–95 from stratiform and alpine peridotites. Art. 206 in Profess. Papers U.S. Geol. Surv. 50E, 101–02 (1963).
Hutton, C. O.: Some igneous rocks from the New Plymouth area. Trans. Roy. Soc. New Zealand 74, 125–53 (1944).
Hytönen, K., Schairer, J. F.: The plane enstatite-anorthite-diopside and its relation to basalts. Yearbook Carnegie Inst. Wash. 60, 125–41 (1961).
Iida, C.: Trace elements in mineral and rocks of the Izu-Hakone region, Japan. Pt. II. Plagioclase. J. Earth Sci. Nagoya Univ. 9, No. 1, 14–28 (1961).
Iida, C., Kuno, H., Yamasaki, K.: Trace elements in minerals and rocks of the Izu-Hakone region, Japan. Pt. I. Olivine. J. Earth Sci. Nagoya Univ. 9, No. 1, 1–13 (1961).
Jackson, E. D.: X-ray determinative curve for natural olivine of composition Fo80–90. Profess. Papers U.S. Geol. Surv. 400-B, 432–34 (1960).
Jambor, J. L., Smith, C. H.: Olivine composition determination with small diameter X-ray powder cameras. Mineral. Mag. 33, 730–41 (1964).
Johnston, R.: The olivines of the Garbh Eilean Sill, Shiant Isles. Geol. Mag. 90, 161–71 (1953).
Kennedy, W. Q.: Trends of differentiation in basaltic magmas. Am. J. Sci., 5th ser. 25, 239–56 (1933).
Knorring, O. von, Kennedy, W. Q.: The mineral paragenesis and metamorphic status of garnet-hornblende-pyroxene-scapolite gneiss from Ghana (Gold Coast). Mineral. Mag. 31, 846–59 (1958).
Kuno, H.: Petrology of Hakone volcano and the adjacent areas. Japan. Bull. Geol. Soc. Am. 61, 957–1020 (1950).
Kuno, H.: Formation of calderas and magmatic evolution. Trans. Am. Geophys. Un. 34, 267–80 (1953).
Kuno, H.: Ion substitution in the diopside ferropigeonite series of clinopyroxenes. Am. Min. 49, 70–93 (1955).
Kuno, H., Hess, H. H.: Unit cell dimensions of clinoenstatite and pigeonite in relation to other common clinopyroxenes. Am. J. Sci. 251, 741–52 (1953).
Kuno, H., Sawatari, M.: On the augites from Wadaki, Izu, and from Yoneyama, Etigo, Japan. Jap. J. Geol. Geogr. 11, 327–53 (1934).
Lacroix, A.: La Montagne Pelée et ses eruptions, 366 p. Paris: Masson et Cie. 1904.
Lacroix, A.: Sur des enclaves endopolygènes de Saint-Vincent. Bull. Soc. Franc. Mineral. Crist. 72, 571–90 (1949).
Larsen, E. S., Draisin, W. M.: Composition of the minerals in the rocks of the Southern Californian batholith. Int. Geol. Congr. 18th Session, Great Britain, 1948), pt. 2, 66–79 (1950).
Larsen, E. S., Irving, J., Gonyer, F. A., Larsen E. S. 3rd.: Petrologic results of a study of the minerals from the Tertiary volcanic rocks of the San Juan region, Colorado. Am. Mineralogist. 21, 679–701 (1936).
Leake, B. E.: On the non-existence of a vacant area in the Hallimond calciferous amphibole diagram. Jap. J. Geol. Geogr. 33, 1–13 (1962).
Leake, B. E.: A catalog of analysed calciferous and subcalciferous amphiboles together with their nomenclature and associated minerals. Spec. Papers Geol. Soc. Am. 98, 210 (1968).
LeBas, M. J.: The role of aluminum in igneous clinopyroxenes with relation to their parentage. Am. J. Sci. 260, 267–88 (1962).
Le Maitre, R. W.: Petrology of volcanic rocks Gough Island, South Atlantic. Bull. Geol. Soc. Am. 73, 1309–40 (1962).
Lewis, J. F.: Mineralogical and petrological studies of plutonic blocks from the Soufrière volcano, St. Vincent, West Indies. Unpublished D. Phil, thesis, Oxford University, 275 (1964).
Lewis, J. F.: Unit cell dimensions of some aluminous natural clinopyroxenes. Am. Mineralogist 52, 42–54 (1967).
Lewis, J. F.: Composition, physical properties and origin of sodic-anothites from the Soufrière volcano, St. Vincent, West Indies. Contr. Mineral. and Petrol. 21, 272–94 (1969).
Lewis, J. F.: Chemical composition and physical properties of magnetite from the ejected plutonic blocks of the Soufrière volcano, St. Vincent, West Indies. Am. Mineralogist 55, 793–807 (1970).
Lewis, J. F.: Petrology of the ejected plutonic blocks of the Soufrière volcano, St. Vincent. J. Petrol. (1973).
MacKenzie, D. B.: High temperature alpine type peridotite from Venezuela. Bull. Geol. Soc. Am. 71, 307–18 (1960).
Miller, F. S.: Petrology of the San Marcos gabbro, Southern California. Bull. Geol. Soc. Am. 48, 1397–1497 (1937).
Murata, K. J., Bastron, H., Brannock, W. W.: X-ray determinative curve for Hawaiian olivines of composition Fo76–88. In Profess. Papers U.S. Geol. Surv. 525-C, 35–37 (1965).
Naboko, S. I., Shavrova, N. N.: On the pyroxenes in lavas of modern and recent eruptions of certain Kamchatka volcanoes. Akad. Nauk S.S.S.R. Volkan. Station Bull. 23, 47–50 (M.A. 13–392) (1954).
Newhouse, W. H.: Opaque oxides and sulphides in common igneous rocks. Bull. Geol. Soc. Am. 47, 1–52 (1936).
Norton, D. A., Clavan, W. S.: The optical mineralogy, chemistry and X-ray crystallography of ten clinopyroxenes from the Pennsylvania and Delaware Piedmont Province. Am. Mineralogist 44, 844–74 (1959).
O'Hara, M. J., Mercy, E. L. P.: Petrology and petrogenesis of some garnetiferous peridotites. Trans. Roy. Soc. Edinburgh 65, 251–314 (1963).
O'Hara, M. J., Schairer, J. F.: The join diopside-pyrope at atmospheric pressure. Yearbook Carnegie Instn. Wash. 62, 107–115 (1963).
Osborn, E. F.: Role of oxygen pressure in the crystallization and differentiation of basaltic magma. Am. J. Sci. 257, 609–47 (1959).
Poldervaart, A., Hess, H. H.: Pyroxenes in the crystallization of basaltic magma. J. Geol. 59, 472–89 (1951).
Ross, C. S., Foster, M. D., Myers, A. T.: Origin of dunites and of olivine-rich inclusions in basaltic rocks. Am. Mineralogist 39, 693–737 (1954).
Ruckmick, J. C., Noble, J. A.: Origin of the ultramafic complex at Union Bay, South Eastern Alaska. Bull. Geol. Soc. Am. 70, 981–1018 (1959).
Segnit, E. R.: Some data on synthetic aluminous and other pyroxenes. Mineral. Mag. 30, 218–26 (1953).
Smith, P. J.: Electron probe microanalysis of optically homogeneous titanomagnetites and ferrian ilmenites in basalts of paleomagnetic significance. J. Geophys. Res. 72, 5087–100 (1967).
Starrabba Stella, F.: Contributo allo studio dei minerali di Ustica. Not. Min. Siciliana e Calabrese, Messina 1, 5–41 (1947).
Sundius, N.: The classification of the hornblendes and the solid solution relations in the amphibole group. Arsbok Sveriges Geol. Undersok 40, 1–36 (1946).
Taylor, R. W.: Phase equilibria in the system FeO-Fe2O3-TiO2 at 1300° C. Am. Mineralogist 49, 1016–30 (1964).
Thompson, J. B.: Role of aluminum in the rock forming silicates. Bull. Geol. Soc. Am. 58, 1232 (1947).
Tilley, C. E., Vincent, H. C. G.: Aluminous pyroxenes in metamorphosed limestones. Geol. Mag. 75, 81–86 (1938).
Verhoogen, J.: Distribution of titanium between silicates and oxides in igneous rocks. Am. J. Sci. 260, 211–20 (1962).
Vincent, E. A.: Hornblende-lamprophyre dykes of basaltic parentage from the Skaergaard area, East Greenland. J. geol. Soc. London 109, 21–49 (1953).
Wager, L. R.: The major element variation of the layered series of the Skaergaard intrusion and a re-estimation of the average composition of the hidden layered series and of the successive residual magmas. J. Petrol. 1, 364–98 (1960).
Wager, L. R.: Igneous cumulates from the 1902 eruption of Soufrière, St. Vincent. Bull. Volcanol. 24, 93–99 (1962).
Wilkinson, J. F. G.: Clinopyroxenes of alkali olivine-basalt magma. Am. Mineralogist 41, 724–43 (1956).
Wilkinson, J. F. G.: Titanomagnetites from a differentiated teschenite sill. Mineral. Mag. 41, 443 (1957).
Wilkinson, J. F. G.: The petrology of a differentiated teschenite sill near Gunnedah, New South Wales. Am. J. Sci. 256, 1–39 (1958).
Wilkinson, J. F. G.: Some aspects of the calciferous amphiboles, oxyhornblende, kaersutite and barkevikite. Am. Mineralogist 46, 340–54 (1961).
Yamazaki, T., Onuki, H., Tiba, T.: Significance of hornblende gabbroic inclusions in caloalkali rocks. Jap. Assoc. Min. Petrol. Econ. Geol. 55, 87–103 (1966).
Yoder, H. S., Jr.: Calc-alkalic andesites: Experimental data bearing on the origin of their assumed characteristics. In: Proceedings of the andesite conference. A. R. McBirney, Editor. Bull. 65 State of Oregon, Dept. of Geology and Mineral Industries, 77–89 (1969).
Yoder, H. S., Jr., Sahama, Th. G.: Olivine X-ray determinative curve. Am. Mineralogist 42, 475–91 (1957).
Yoder, H. S., Jr., Tilley, C. E.: Origin of basalt magmas: An experimental study of natural and synthetic rock systems. J. Petrol. 3, 342–532 (1962).
Yoder, H. S., Jr., Tilley, C. E., Schairer, J. F.: Pyroxenes and associated minerals in the crust and mantle. Pyroxene Quadrilateral. Yearbook Carnegie Instn. Wash. 62, 84–95 (1963).
Author information
Authors and Affiliations
Rights and permissions
About this article
Cite this article
Lewis, J.F. Mineralogy of the ejected plutonic blocks of the soufriere volcano St. Vincent: Olivine, pyroxene, amphibole and magnetite paragenesis. Contr. Mineral. and Petrol. 38, 197–220 (1973). https://doi.org/10.1007/BF00374766
Received:
Issue Date:
DOI: https://doi.org/10.1007/BF00374766