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• W77875864 abstract "Introduction: Pallasites are mixtures of ironnickel metal and magnesian olivine thought to have been formed at core-mantle boundaries. Most are grouped into the main-group (PMG) on the basis of metal and olivine composition, and olivine oxygenisotopic composition. Three pallasites differing in all these properties form the Eagle Station grouplet (PES), and are likely from a single parent body. Two unusual pyroxene-bearing pallasites may, or may not, be from a single parent body (see review in [1]). All PMG may have originated on a single parent body, although some are anomalous; several have unusually high metal Ir contents (PMG-ai), one has an anomalously low metal Ge content (PMG-ag), and several have atypically ferroan olivines (PMG-af) (nomenclature of [2].) The pallasites experienced subsolidus equilibration and redox reactions which likely destroyed any original magmatic signature in olivine Fe-Mg distributions. This is similar to the case of the diogenites where post-igneous homogenization of orthopyroxene Fe/Mg occurred [3]. Diogenite trace element contents retain evidence for igneous fractionation, and in hopes that pallasite olivines may likewise hold clues to their origin, I began a geochemical study of them. Here I present the preliminary results, focusing on the PMG. Sampling and Results: I have done EMPA for Si, Mg, Fe, Ca, Cr and Mn, and INAA for Sc, Cr, Co, Ni and Zn on a suite of pallasite olivines. The olivines were etched in dilute HCl to remove rust, metal, troilite and phosphate contaminants and hand-picked under binocular microscope to yield clean, 100% pure, olivine samples. One inclusion-rich sample of Cold Bay olivine was analyzed as was chromite from PCA 91004. Additional data used here are from [2,4,5]. Main-group pallasite olivines show limited variation in major element contents. Excluding the PMGaf, FeO and MgO variations are about ±4% and ±1% relative [5]. In contrast, variations in minor and trace transition element contents are substantial; Sc from 0.69 to 2.09 μg/g, Cr from 160 to 600 μg/g, Mn from 1.5 to 2.6 mg/g and Zn from 5.0 to 7.9 μg/g. The sole PMG-af studied, Springwater, has low Sc (0.54 μg/g) and Cr (170 μg/g), and high Mn (2.5 mg/g) and Zn (7.7 μg/g). The PMG-ai Finmarken, Marjalahti and PCA 91004 olivines are not unusual, while Pavlodar olivine has a high Mn content (2.6 mg/g) and Huckitta olivine has a high Sc content (2.43 μg/g, [4]). The sole PMG-ag, Glorieta Mountain has olivine with high Sc (2.29 μg/g) and Mn (2.3 mg/g) contents. Olivines in the PES, Cold Bay, Eagle Station and Itzawisis, have higher Sc contents (~2.6 μg/g) and lower Mn (~1.4 mg/g) and Zn (~0.7 μg/g) contents than main-group pallasite olivines. Excluding PMG-af, main-group pallasites show a crude positive correlation between Sc and molar Mn/Mg ratio, and a negative correlation of Zn with molar Mn/Mg (Figs. 1, 2). The Sc Mn/Mg correlation may simply be two diffuse groups, low Sc, Mn/Mg and high Sc, Mn/Mg groups, rather than a continuous sequence. Multiple analyses of olivine from a single pallasite suggest that the scatter ( Fig. 1) is not due to small, tens-of-cm scale heterogeneity, i.e. not intra-pallasite variation, but rather, inter-pallasite variation." @default.
• W77875864 created "2016-06-24" @default.
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• W77875864 date "1999-03-01" @default.
• W77875864 modified "2023-09-25" @default.
• W77875864 title "Geochemistry and Origin of Pallasite Olivines" @default.
• W77875864 hasPublicationYear "1999" @default.
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