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group (PMG) and the Eagle Station grouplet (PES). In the meantime, additional pyroxene-bearing pallasites...10019 was purchased by Steve Arnold from Morocco in January 2015 and consisted of one 580 gram fusion...2Wo1.0±0.2, Fe/Mn=23±1, n=6, ~10 vol %), all set in a matrix of taenite (Fe=72.0±4.0, Ni=27.4±2.4, Co=0...analyzed in 11 replicates by laser fluorination) are different from other pyroxene pallasites in that they...significantly elevated in fayalite content relative to PMG and are similar to olivines in Springwater (PMG-an) |
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Pyroxene is an important rock-forming mineral found in the Earth’s upper mantle and on the surfaces of inner...inferred by remote reflectance spectroscopy (mainly in the near-infrared (NIR) region), thus making the...phases [5]. This anomaly is similar to that observed in Mössbauer spectra of some Ca-rich clinopyroxenes...pyroxenes shows a residual electron density peak in the difference-Fourier synthesis, located at ~ 0...the existence of two different local configurations in the M2 cavity, a hedenbergite-like arrangement and |
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MÖSSBAUER SPECTROSCOPY OF OLIVINES FROM THE D’ORBIGNY METEORITE Y. A. Abdu1, M. E. Varela2 and F. C. Hawthorne1... 5444 A PRELIMINARY STUDY OF MAGMATIC VOLATILES IN ANGRITES F. A. J. Abernethy1, A. Verchovsky1, I....Olivine is a major basaltic mineral in high-temperature volcanic rocks and in stony meteorites. The D’Orbigny...angrite contains large olivine crystals (up to 1 cm in size) that are present throughout the rock, mimicking...GOl; 856, 824 cm)1 for POl, reflecting variability in composition. Using the x (= j1-j2) – Mg# relation |
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classified into petrologic types 1 and 2 [1,2]. However, in recent years, CR samples experiencing thermal metamorphism...heterogeneity is observed even in a single PTS. It is noted that the size of Fe-Ni metal in one of the PTSs are...much larger (~2 mm) than that in the other (~0.8 mm, mostly 0.2 mm). In our Tafassasset PTSs, no relict...compositions of Tafassasset are mostly homogeneous in major elements: olivine (Fa26-28), high-Ca pyroxene...cooling histories. Al and Ti contents in low-Ca pyroxene are homogeneous in NWA 7317 (Al2O3: 0.6-0.9 wt%, TiO2: |