Abstract
Thermodynamic studies of Mueller (1962) and Thompson (1969) and the crystallographic work of Ghose (1965) gave new impetus to a rapidly developing branch of mineralogy. Orthopyroxenes were studied by Virgo and Hafner (1969) and Saxena and Ghose (1971) using Mössbauer technique. Site-occupancy data have been used in many mineralogical and petrological problems, e.g., to estimate the thermodynamic solution properties of pyroxenes and to understand the cooling history of rocks. A parallel development in the mineralogy of clinopyroxene did not take place, particularly because the Mössbauer technique proved unsatisfactory for calcic pyroxenes. Recognizing this, we undertook a detailed X-ray crystallographic study of the clinopyroxenes and succeeded to determine crystal-structural parameters for Fe-Mg site occupancies of the nonequivalent Ml and M2 sites. Until now there are no published site-occupancy data on a series of clinopyroxene of intermediate composition. This paper attempts to fill this important gap in the data on clinopyroxenes. Besides our concern for the crystal-chemical and thermodynamic aspects of such a study, we were also motivated by the possible use of pyroxene crystallographic parameters in the classification and characterization of magmatic rocks. With the advent of automation in X-ray crystallography, it is possible to study a number of crystals from one or more rock samples in a relatively short time and provide petrologically useful information.
This is a preview of subscription content, log in via an institution to check access.
Access this chapter
Tax calculation will be finalised at checkout
Purchases are for personal use only
Preview
Unable to display preview. Download preview PDF.
References
Abbate, E., Facibeni, P., Gregnanin, A., Merla, G., and Sagri, M. (1969) Basalt flows and related sandstones in Socota area (Northern Ethiopia), Boll. Soc. Geol. It. 88, 499–516.
Brotzu, P., Ganzerli-Valentini, M. T., Morbidelli, L., Piccirillo, E. M., and Traversa, G. (1981) Basaltic volcanism in the northern sector of the Main Ethiopian Rift, J. Volc. Geoth. Res., 10, 365–382.
Burnham, W., Clark, J. R., Papike, J. J., and Prewitt, (1967) A proposed crystallographic nomenclature for clinopyroxene structures, Z Krist. 125, 1–6.
Clark, J. R., Appleman, D. E., and Papike, J. J. (1969) Crystal-chemical characterization of clinopyroxenes based on eight new structure refinements, Miner. Soc. Amer. Spec. Pap. 2, 31–50.
Dowty, E., and Clark, J. R. (1973) Crystal structure refinement and optical properties of a Ti3+ fassaite from the Allende meteorite, Amer. Miner. 58, 230–242.
Finger, L. W. (1972) The uncertainty in the calculated ferric iron content of a microprobe analysis, Cam. Inst. Wash., Y. B. 71, 600–603.
Ghose, S. (1965) Mg2+, Fe24” order in an orthopyroxene, Mg0.93Fe1.07S12O6, Z. Krist. 122, 81–99.
Ghose, S., Wan, C, and Okamura, F. P. (1975) Site preference and crystal chemistry of transition metal ions in pyroxenes and olivine (Abstract), Acta Cryst. A 31, S76.
Hafner, S. S., and Virgo, D. (1970) Temperature-dependent cation distributions in lunar and terrestrial pyroxenes, Proc. Apollo 11 Lun. Sci. Conf. 3, 2183–2198.
Hafner, S. S., Virgo, D., and Warburton, D. (1971) Cation distributions and cooling history of clinopyroxenes from Oceanus Procellarum, Proc. 2nd Lun. Conf. 1, 91–108.
Hazen, R. M., and Finger, L. W. (1977) Crystal structure and compositional variation of Angra Dos Reis fassaite, Earth Planetary Sci. Lett. 35, 357–362.
Honstra, J., and Stubbe, B. (1972) PW 1100 Data Processing Program, Research Laboratories, Eindhoven, Holland.
MacDonald, G., and Katsura, T. (1964) Chemical compositions of Hawaiian lavas, J. Petrol 5, 82–133.
Mason, P. K., Frost, M. T., and Reed, J. S. B. (1969) Computer programs for calculating correlations in quantitative X-ray microanalysis, Nat. Phys. Lab. (U.K.) IMS Rep. 2.
McCallister, R. H., Finger, L. W., and Ohashi, Y. (1976) Intracrystalline Fe2+-Mg equilibria in three natural Ca-rich clinopyroxenes, Amer. Miner. 61, 671–676.
Morimoto, N., Nakajuma, Y., Syono, Y., Akimoto, S., and Matsui, Y. (1975) Crystal structures of pyroxene-type ZnSiO3 and ZnMgSi2O6, Acta Cryst. 31, 1041–1049.
Mueller, R. F. (1962) Energetics of certain silicate solutions, Geochim. Cosm. Acta 26, 581–598.
North, A.C.T. Phillips, D. C, and Mathews, F. S. (1968) A semi-empirical method of absorption correction, Acta Cryst. A 24, 351–359.
Papike, J. J., Cameron, K., and Baldwin, K. (1974) Amphiboles and pyroxenes: characterization of other than quadrilateral components and estimates of ferric iron from microprobe data, Geol. Soc. Amer. 6, 1053–1054.
Peacor, D. R. (1967) Refinement of the crystal structure of a pyroxene formula MIMII(Si1.5Al0.3)O6, Amer. Miner. 52, 31–41.
Piccirillo, E. M., Justin-Visentin, E., Zanettin, Joron, J. L., and Treuil, M. (1979) Geodynamic evolution from plateau to rift: major and trace elment geochemistry of the central eastern Ethiopian plateau volcanics, N. Jb. Geol. Paläont. Abh. 158, 139–179.
Rossi, G., Tazzoli, V., and Ungaretti, L. (1978) Crystal-chemical studies on sodic clinopyroxenes, Proc. 11th Int. Mineralog. Ass. 11th Meeting, Novosibirsk.
Saggerson, E. P., and Williams, L. A. J. (1964) Ngurumanite from southern Kenya and its bearing on the origin of rocks in the northern Tanganyka alkaline district, J. Petrol. 5, 40–81.
Saxena, S. K. (1973) Thermodynamics of Rock-Forming Crystalline Solutions. Springer-Verlag, Berlin.
Saxena, S. K., and Ghose, S. (1971) Mg2+-Fe2+ order-disorder and the thermodynamics of the orthopyroxene-crystalline solution, Amer. Miner. 56, 532–559.
Takeda, H. (1972) Crystallographic studies of coexisting aluminan orthopyroxene and augite of high-pressure origin, J. Geophys. Res. 11, 5798–5811.
Takeda, H., Miyamoto, M., and Reid, A. M. (1974) Crystal chemical control of element partitioning for coexisting chromite-ulvöspinel and pigeonite-augite in lunar rocks, Proc. 5th Lun. Sci. Conf. 1, 727–741.
Thompson, J. Jr. (1969) Chemical reaction in crystals, Amer. Miner. 54, 341–375.
Tokonami, M. (1965) Atomic scattering factor for O2-, Acta Cryst. 19, 486.
Ungaretti, L., Mazzi, F., Rossi, G., and Dal Negro, A. (1978) Crystal-chemical characterization of blue amphiboles, Proc. 11th Int. Mineralog. Ass. 11th Meeting, Novosibirsk.
Virgo, D., and Hafner, S. S. (1969) Fe2+, Mg order-disorder in heated orthopyroxenes, Miner. Soc. Amer. Spec. Pap. 2, 67–81.
Zachariasen, W. H. (1963) The secondary extinction correction, Acta Cryst. 16, 1139–1144.
Zanettin, B. Gregnanin, A., Justin-Visentin, E., Mezzacasa, G., and Piccirillo, E. M. (1974) Petrochemistry of the volcanic series of the Central Eastern Ethiopian plateau and relationships between tectonics and magmatology, Mem. Ist. Geol. Miner. Univ. Padova 31, 1–34.
Zanettin, B. Gregnanin, A., Justin-Visentin, E., Mezzacasa, G., and Piccirillo, E. M. (1976) New chemical analyses of the Tertiary volcanics from the Central Eastern Ethiopian plateau, C.N.R., Istit. Miner. Petrol. Univ. Padova 1, 1–43.
Zanettin, B. Justin-Visentin, E., and Piccirillo, E. M. (1978) Volcanic succession, tectonics and magmatology in Central Ethiopia, Memorie Accademia Patavina Scienze Lettere Arti, 90, 1–19.
Zanettin, B. Justin-Visentin, E., Nicoletti, M. and Piccirillo, E. M. (1980) Correlations among Ethiopian volcanic formations with special references to the chronological and stratigraphical problems of the “Trap series, “ in Geodynamic Evolution of the Afro-Arabian Rift System, Acc. Naz. Lincei, Roma, 47, 231–252.
Editor information
Editors and Affiliations
Rights and permissions
Copyright information
© 1982 Springer-Verlag New York Inc.
About this chapter
Cite this chapter
Negro, A.D., Carbonin, S., Molin, G.M., Cundari, A., Piccirillo, E.M. (1982). Intracrystalline Cation Distribution in Natural Clinopyroxenes of Tholeiitic, Transitional, and Alkaline Basaltic Rocks. In: Saxena, S.K. (eds) Advances in Physical Geochemistry. Advances in Physical Geochemistry, vol 2. Springer, New York, NY. https://doi.org/10.1007/978-1-4612-5683-0_3
Download citation
DOI: https://doi.org/10.1007/978-1-4612-5683-0_3
Publisher Name: Springer, New York, NY
Print ISBN: 978-1-4612-5685-4
Online ISBN: 978-1-4612-5683-0
eBook Packages: Springer Book Archive