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. We found no detectable radiogenic 26 mg in the pallasite and chondrule olivines. Mg isotope composition of san carlos olivine in different sampling. The chemical composition of most olivine falls somewhere between pure forsterite mg 2 sio 4 and pure fayalite fe 2 sio 4. In that series, mg and fe can substitute freely for one another in the minerals atomic structure in any ratio. Matsui y, syono y 1968 unit cell dimensions of some synthetic olivine. The highpressure structural evolution of olivine along the. Quantification of oxygen isotope sims matrix effects in olivine. Olivine minerals constitute an isomorphous group of orthosilicates. The oxygen isotope composition of san carlos olivine on the. Magnesium isotopic composition of olivine from the earth, mars, moon, and pallasite parent body. The epma compositions i found from the grains of san carlos olivine being used as sims oxygen standards, mounted with the unknown olivines, differed. Use of natural single crystals also restricts the possibilities for investigation of the partitioning of minor and trace elements.
Synthetic olivine capsules for use in experimentsk william nash. Brillouin scattering and xray diffraction of san carlos olivine. Femg olivine solid solutions, carnegie institution of washington year book, 66, 209217. All elastic constants, the average bulk and shear moduli, and the lattice parameters of san carlos olivine fo90 initial density 3. In that generalized composition, a is usually mg or fe, but in unusual situations can be ca, mn, or ni. An investigation of san carlos olivine department of geoscience. Pallasite parent body the brenham meteorite is a main group pallasite with fo 88 olivines mittlefehldt et al. The elastic constants of san carlos olivine to 17 gpa abramson. Elasticity of san carlos olivine to 8 gpa and 1073 k liu. Magnesium isotopic composition of olivine from the earth.
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. Olivine is the name given to a group of silicate minerals that have a generalized chemical composition of a 2 sio 4. Notes on some crystals of san carlos olivine and epma standards. Various mantle lithologies can be discriminated using olivine composition. 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. Synthetic olivine capsules for use in experimentsk. Extensive solid solution exist between endmember compositions of the olivine group when large cations ore of similar size like mg fe. Overall, the olivine compositions are broadly comparable with main ore olivine chemistry reported from the kevitsa deposit mutanen, 1997. 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. Download table mg isotope composition of san carlos olivine in different sampling positions from publication. High precision analysis of mg isotopic composition in. For all the investigated compositions, the m2 crystallographic site, with its bonding.
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