Acta naturalia Islandica - 01.07.1964, Side 33

Acta naturalia Islandica - 01.07.1964, Side 33
THE ANKARAMITES OP HVAMMSMÚLI, EYJAFJÖLL, SOUTHERN ICELAND 31 the people at Hvammur and Skógar, S.-Iceland, for their help and hospitality during the time of the field work. REFERENCES Barth, T. F. W. 1936. The crystallization process of basalt. Am. Jour. Sci. 31: 321—351. Bartrum, J. A. 1942. Unusual olivine in basalt near Auckland, New Zealand. Jour. Geol. 50: 914—917. Bödvarsson, G. 1957. Geothei-mal effect of Pleistocene g-laciation. Jökull. 7: 1-—20. Clark, R. H. 1952. The significance of flow structure in the microporphyritic ophitic basalts of Arthur’s Seat. Trans. Ed. Geol. Soc. 15: 69—83. Deer, W. A., Howie, R. A. & Zussmann, J. 1962. Rock Forming Mineráls. London. Drever, H. I. & Johnston, R. 1957. Crystal growth of forsteritic olivine in magmas and melts. Trans. Roy. Soc. Ed. 63: 289—315. Goodyear, J. and Duffin, W. J. 1954. The identification and determination of plagio- clase feldspars by the X-ray powder method. Min. Mag. 30: 306—326. Hamilton, D. L., Burnham, C. W. & Osborn, E. F. 1964. The solubility of water and effects of oxygen fugacity and water content on crystillization in mafic magmas. Jour. Pet. 5: 21—39. Holmes, A. 1921. Petrographic Methods and Cálculations. London. „ „ 1957. Principles of Physicál Geology. Edinburgh. Johannsen, A. 1931. A Descriptive Petrography of the Igneous Rocks. Chicago. Johnston, R. 1953. The olivines of the Garbh Eilean sill, Shiant Isles. Geol. Mag. 90: 161—171. „ „ 1953. A graph of optical properties and composition of olivines. Unpublished, personal communication. Kjartansson, G. et. al. 1959. On geology and geography of Iceland. Geogr. Ann. Stockh. 41: 135—169. Loftsson, M. 1880. Rit um jaröelda á íslandi. Reykjavík. Macdonald, G. A. 1944. Unusual feature in ejected blocks at Kilauea volcano. Am. Jour. Sci. 242: 322—326. „ „ 1949. Hawaiian petrographic province. Bull. Geol. Soc. Am. 66: 1541—1596. Munro, M. 1963. Errors in the measurements of 2V with the universal stage. Am. Min. 48: 308—323. Noe-Nygaard, A. 1940. Subglacial volcanic activity in ancient and recent times. Folia Geographica Danica, Tom. 1, No. 2. Osborn, E. F. and Tait, D. B. 1952. The system diopside-forsterite-anorthite. Am. Jour. Sci., Bowen Volume: 413—433. „ „ 1959. Role of oxygen pressure in the crystaliization and differantiation of basaltie magma. Am. Jour. Sci. 257: 609—647. Poldervaart, A. and Gilkey, A. K. 1954. On clouded plagioclase. Am. Min. 39: 75—91. Thoroddsen, Th. 1925. Die Geschichte der islándischen Vulkane. Köbenhavn. Tomkeieff, S. I. 1939. Zoned olivines and their petrogenetic significance. Min. Mag. 25: 229—251. Tröger, W. E. 1956. Optische Bestimmung der gesteinsbildenden Minerále, Part l,2nd ed. Stuttgart.

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