Abstract
The cation distribution of natural and heated ferromagnesian olivine with chemical composition, Fo67Fa33, from metagabbro was examined by X-ray diffraction. Heating and quenching experiments were made by a newly devised apparatus which enables us to obtain very fast quenching speed in comparison with the usual technique. The distribution constants, K D=(Fe+2/Mg) M1/(Fe+2/Mg) M2, of the natural samples were less than 1.07, and those of heat-treated samples were more than 1.15, indicating that cation ordering takes place with temperature. The distribution of Fe+2 and Mg is nearly random at low temperatures, whereas Fe+2 shows a slight but significant preference for a smaller M1 site at high temperatures. The change of the distribution constant was observed on specimens which were heated for a short period of time (6–1,060 s) and quenched within 10 ms. Thus the rate of the cation reordering reaction is a very fast process. The lattice parameters b and c decrease whereas a increases with the increase of distribution constant. The overall effect on unit cell volume is a decrease with the increasing distribution constant, suggesting the presence of significant pressure dependence of the cation distribution towards the ordering of Fe at M1 site in ferromagnesian olivine.
This is a preview of subscription content, log in via an institution to check access.
Similar content being viewed by others
References
Ando K, Kurokawa H, Oishi Y (1981) Self-diffusion coefficient of oxygen in single-crystal forsterite. J Am Ceram Soc 64:c–30
Basso R, Dal Negro A, Della Giusta A (1979) Fe/Mg distribution in the olivine of ultrafemic nodule from Assab (Ethiopia). Neues Jahrb Mineral Monatsh: 197–202
Bence AE, Albee AL (1968) Empirical correction factors for the electron microanalysis of silicate and oxide. J Petrol 76:382–403
Besancon JR (1981) Rate of cation distribution in orthopyroxene. Am Mineral 66:965–973
Birle D, Gibbs GV, Moore PB, Smith JV (1968) Crystal structure of natural olivines. Am Mineral 53:807–824
Brown GE, Prewitt CT (1973) High temperature crystal chemistry of hortonolite. Am Mineral 58:577–587
Burns RG (1969) Evidence for cation ordering in olivine minerals from crystal field spectra (abstract) Acta Crystallogr A25:559
Burns RG (1970) Crystal field spectra and evidence of cation ordering in olivine minerals. Am Mineral 55:1608–1632
Bush WR, Hafner SS, Virgo D (1970) Some ordering of iron and magnesium at the octahedrally coordinated sites in a magnesium rich olivine. Nature 227:1339–1341
Champness PE (1970) Neucleation and growth of iron oxides in olivines, (Mg,Fe)2SiO4. Mineral Mag 37:790–800
Doyle PA, Turner PS (1968) Relativistic Hartree-Fock X-ray scattering factors. Acta Crystallogr A24:390–397
Finger WL (1970) Fe/Mg ordering in olivines. Carnegie Inst Washington Yearb 69:302–305
Finger WL, Virgo D (1971) Confirmation of Fe/Mg ordering in olivines. Carnegie Inst Washington Yearb 70:221–225
Finger WL (1972) A Fortran IV Computer Program for structure factor calculation and least-squares refinement of crystal structures. Geophys Lab, Carnegie Inst Washington, Washington D.C.
Francis CA, Ribbe PH (1980) The forsterite-tephroite series I. Crystal structure refinements. Am Mineral 65:1263–1269
Fujino K (1980) Crystal chemistry of Mn-Mg-Fe olivine solid solution series. J Mineral Soc Japan 14, Spec Issue 3:135–143 (in Japanese with english abstract)
Ganguli J (1977) Crystal chemical aspects of olivine structures. Neues Jahrb Mineral Abh 130:303–318
Ghose S, Wan C, Okamura PF, Ohashi H, Weidner JR (1975) Site preference and crystal chemistry of transition metal ions in pyroxenes and olivines. Acta Crystallogr A31, Suppl S 76
Ghose S, Wan C, McCallum IS (1976) Fe+2-Mg+2 order in an olivine from the lunar anorthosite 67075 and the significance of cation order in lunar and terrestrial olivines. Indian J Earth Sci 3:1–8
Henke K (1965) Beiträge zu Kristallstructuren vom Olivin-typ. Beitr Mineral Petrogr 11:535–558
Lumpkin GR, Ribbe PH (1983) Composition, order-disorder and lattice parameters of olivines: Relationship in silicate, germanate, beryllate, phosphate and borate olivines. Am Mineral 68:164–176
Lumpkin GR, Ribbe PH, Lumpkin NE (1983) Composition, orderdisorder and lattice parameters of olivines: Determinative methods for Mg-Mn and Mg-Ca silicate olivines. Am Mineral 68:1174–1182
Mokeyeva VI, Simonov MA, Belokoneva EL, Makarov ES, Ivanov VI, Rannev NV (1977) X-ray study of details of atomic structure and distribution of magnesium and iron atoms in lunar and terrestrial olivines. Geochem Interna 13:50–57
Moor JG, Evans BW (1967) The role of olivine in the crystallization of the Prehistoric Makaopuli Tholeiitic Lava Lake, Hawaii. Contrib Mineral Petrol 15:202–223
Nakamura Y, Kushiro I (1970) Compositional relations of coexisting orthopyroxene, pigeonite and augite in a tholeiitic andesite from Hakone Volcano. Contrib Mineral Petrol 26:265–275
Shinno I (1974) Mössbauer studies of natural olivines. Mineral J Japan 7:344–358
Shinno I (1974) Mössbauer studies of olivine, — the relation between Fe+2 site occupancy numbers TMi and interplanner distances d130 —. Memoirs Geol Soc Japan 11:11–17
Shinno I (1980) On the distribution of cation in (Mg, Fe)2SiO4 solid solution. Sci ReptDepart Geol Kyushu Univ 13:217–224 (in Japanese with english abstract)
Smyth JR, Hazen RM (1973) The crystal structure of forsterite and hortonolite at several temperature up to 900° C. Am Mineral 58:588–593
Virgo D, Hafner SS (1972) Temperature-dependent Mg, Fe distribution in a lunar olivine. Earth Planet Sci Letters 14:305–312
Wenk HR, Raymond KN (1973) Four new structure refinements of olivine. Z Kristallogr 137:86–105
Yoshizawa H, Nakajima W, Ishizaka K (1966) The Ryoke metamorphic zone of Kinki district, Southern Japan: Accomplishment of a regional geological map. Memoirs Coll Sci Univ Kyoto, Ser B32:437–454
Author information
Authors and Affiliations
Rights and permissions
About this article
Cite this article
Aikawa, N., Kumazawa, M. & Tokonami, M. Temperature dependence of intersite distribution of Mg and Fe in olivine and the associated change of lattice parameters. Phys Chem Minerals 12, 1–8 (1985). https://doi.org/10.1007/BF00348738
Received:
Issue Date:
DOI: https://doi.org/10.1007/BF00348738