The epma compositions i found from the grains of san carlos olivine being used as sims oxygen standards, mounted with the unknown olivines, differed. Femg olivine solid solutions, carnegie institution of washington year book, 66, 209217. Extensive solid solution exist between endmember compositions of the olivine group when large cations ore of similar size like mg fe. We found no detectable radiogenic 26 mg in the pallasite and chondrule olivines.
The chemical composition of most olivine falls somewhere between pure forsterite mg 2 sio 4 and pure fayalite fe 2 sio 4. Notes on some crystals of san carlos olivine and epma standards. Olivine minerals constitute an isomorphous group of orthosilicates. Brillouin scattering and xray diffraction of san carlos olivine. Mg isotope composition of san carlos olivine in different sampling. Magnesium isotopic composition of olivine from the earth. An investigation of san carlos olivine department of geoscience. Elasticity of san carlos olivine to 8 gpa and 1073 k liu. At sakatti, however, no olivine has been identified that approaches the unusual ultranickeliferous up to 14,000 ppm composition found in the nipge ore at kevitsa yang et al. The elastic constants of san carlos olivine to 17 gpa abramson. Spinel, garnet and garnetspinel peridotites can be distinguished in olivine sczr and mnoal 2 o 3 diagrams, whereas volcanic olivine is distinguished by high ca and al contents picritic olivine or high nb contents kimberlitic olivine. Quantification of oxygen isotope sims matrix effects in olivine. The highpressure structural evolution of olivine along the. Pallasite parent body the brenham meteorite is a main group pallasite with fo 88 olivines mittlefehldt et al.
Synthetic olivine capsules for use in experimentsk william nash. In that series, mg and fe can substitute freely for one another in the minerals atomic structure in any ratio. Various mantle lithologies can be discriminated using olivine composition. Matsui y, syono y 1968 unit cell dimensions of some synthetic olivine. In that generalized composition, a is usually mg or fe, but in unusual situations can be ca, mn, or ni. Magnesium isotopic composition of olivine from the earth, mars, moon, and pallasite parent body. Synthetic olivine capsules for use in experimentsk. For all the investigated compositions, the m2 crystallographic site, with its bonding. Olivine is the name given to a group of silicate minerals that have a generalized chemical composition of a 2 sio 4. Fisher g w 1967 femg olivine solid solutions, carnegie institution of washington year book, 66, 209217 birle j d, gibbs g v, moore p b, smith j v 1968 crystal structures of natural olivines, american mineralogist, 53, 807824 view file. Overall, the olivine compositions are broadly comparable with main ore olivine chemistry reported from the kevitsa deposit mutanen, 1997. The mg isotopic compositions of three terrestrial olivine and two pallasite olivine samples are shown to be identical to that of san carlos olivine standard within analytical uncertainties. Since concentrations of group iii elements in olivine are diagnostic of wholerock contents they can be used to trace the petrogenetic history of the rock. Use of natural single crystals also restricts the possibilities for investigation of the partitioning of minor and trace elements.
High precision analysis of mg isotopic composition in. The oxygen isotope composition of san carlos olivine on the. All elastic constants, the average bulk and shear moduli, and the lattice parameters of san carlos olivine fo90 initial density 3. Download table mg isotope composition of san carlos olivine in different sampling positions from publication.
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