Determination of the Fe oxidation state of the Chassigny kaersutite: A microXANES spectroscopic study

Monkawa, Akira; Mikouchi, T.; Koizumi, E.; Sugiyama, Kazumasa; Miyamoto, M.

doi:10.1111/j.1945-5100.2006.tb00524.x

Cited by 27 publications

(32 citation statements)

References 24 publications

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“…The Fo contents of olivine in the analyzed Itokawa particles including new samples are all in the limited range ) ratios have been well determined by wet chemistry (Monkawa et al 2006;Satake et al 2014). The presence of two peaks corresponding to Fe 2+ and Fe 3+ is obvious.…”

Section: Equilibrated Nature Of Analyzed Particlesmentioning

confidence: 80%

“…Details of the SR-XRD measurement are described in Hagiya et al (2010). For plagioclase in RA-QD02-0100 and RA-QD02-0133-1, we performed SR iron X-ray absorption near-edge structure (XANES) measurements to determine the presence of Fe 3+ at BL-4A, Photon Factory (PF), High Energy Accelerator Research Organization (KEK, Ibaraki, Japan) using the method described in Monkawa et al (2006) and Satake et al (2014). The SR X-ray beam size was approximately 5 × 6 μm.…”

Section: Methodsmentioning

confidence: 99%

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Mineralogy and crystallography of some Itokawa particles returned by the Hayabusa asteroidal sample return mission

et al. 2014

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We studied seven Itokawa particles provided by the Japan Aerospace Exploration Agency (JAXA) as first International Announcement of Opportunity (AO) study mainly using electron and synchrotron radiation X-ray beam techniques. All the analyzed particles were collected from the first-touchdown site and composed of olivine and plagioclase with traces of Ca phosphate and chromite, and do not contain pyroxenes. Optical microscopy of these particles shows minor undulatory extinction of olivine and plagioclase, suggesting minor shock metamorphism (shock stage: S2). The electron microprobe analysis shows that olivine is

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Section: Equilibrated Nature Of Analyzed Particlesmentioning

confidence: 80%

Section: Methodsmentioning

confidence: 99%

Mineralogy and crystallography of some Itokawa particles returned by the Hayabusa asteroidal sample return mission

et al. 2014

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“…Watson et al (1994) characterized this kaersutite as OH-poor based on their ion microprobe analysis of kaersutite. However, the Fe micro-XANES analysis of Monkawa et al (2006) indicates little to no Fe 3+ . This would be consistent with an OH-poor kaersutite only if the kaersutite had unusually high amounts of oxy-component.…”

Section: Constraints On the Pressure Of Crystallizationmentioning

confidence: 99%

Alkalic parental magmas for chassignites?

Nekvasil

Filiberto

McCubbin

et al. 2007

Meteorit & Planetary Scien

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Abstract-Detailed analysis of cumulate and melt inclusion assemblages in the chassignites provide important constraints on the nature of the melt trapped as inclusions in cumulus olivine (and, by extension, parental magma compositions), the pressures of crystallization, and magmatic volatile contents. These mineral assemblages show strong similarities to the experimental fractionation assemblages that produce the sodic silica-saturated alkalic lavas on Earth (e.g., Ascension Island, Azores, the Nandewar volcano of Australia). The experimental assemblages were produced from silica-saturated hawaiite at pressures above 4.3 kbar with dissolved water contents above 0.5 wt%. Such pressures are consistent with Ti:Al ratios of the melt-inclusion pyroxenes in the Chassigny meteorite. Pyroxene compositions suggest early high crystallization temperatures and thus relatively low initial water and F contents. Feldspars indicate that melt evolution proceeded to rhyolite compositions both within the interstices of the cumulate olivine and within the melt inclusions, even though rhyolitic glass is only found within olivine-hosted polyphase melt inclusions. The observed rhyolite glass is compositionally similar to the alkali-rich rhyolite of Ascension Island which is produced experimentally by crystallization of hawaiite. It is proposed that the melt trapped in cumulus olivine of the Chassigny dunite was similar to a terrestrial silica-saturated hawaiite, while that trapped in olivine of the Northwest Africa (NWA) 2727 dunite was less evolved, perhaps mildly alkalic basalt. Melts similar to terrestrial intra-plate tholeiite could be parental to the cumulus minerals and evolve upon crystallization at pressures above 4.3 kbar and water contents abovẽ 0.4 wt% to mildly alkalic basalt, silica-saturated hawaiite, and alkali-rich rhyolite. The melt inclusion assemblages are inconsistent with either crystallization of a low-Al, high-Fe basalt, or lowpressure crystallization of a terrestrial-like tholeiite.

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“…However, Martian amphibole occurs as only minute grains (up to several tens of µm) with very low abundance (modal abundance <0.1%). They are present exclusively in magmatic inclusions (usually less than several hundreds of µm in diameter) of pyroxene and olivine grains from shergottites and chassignites (e.g., Johnson et al, 1991;Mikouchi and Miyamoto, 2000;Monkawa et al, 2006). Martian amphibole is Ti -rich kaersutite, which is distinct from terrestrial kaersutite (Monkawa et al, 2006).…”

Section: Introductionmentioning

confidence: 99%

Crystallography of hornblende amphibole in LAP04840 R chondrite and implication for its metamorphic history

Ota

Mikouchi

Sugiyama

2009

Journal of Mineralogical and Petrological Sciences

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LAP04840 is an unusual R chondrite that includes abundant hornblende amphibole. LAP04840 shows a texture of equilibrated chondrite composed of 59.3% olivine, 13.5% orthopyroxene, 13.3% hornblende, 6.2% plagioclase, 6.0% Fe -Ni sulfide, and 1.7% accessory minerals. Hornblende replaces olivine and pyroxene in both chondrules and matrices, suggesting its secondary origin. 3+ at these sites. The mineralogy and petrology of LAP04840 are consistent with its classification as an R6 chondrite. However, the presence of hornblende and biotite is quite unique among not only R chondrites but also asteroidal meteorites in general. The presence of these hydrous minerals suggests metamorphism under high pressure and an aqueous environment probably at depth in the parent body. A thermometer using hornblende and plagioclase equilibria gives T = 670 -690 °C. Further, a barometer using Al content in hornblende gives P = ~ 0.1 GPa. Although these estimates bear some uncertainties, it is likely that the size of the R chondrite parent body was large enough to induce such metamorphism.

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Determination of the Fe oxidation state of the Chassigny kaersutite: A microXANES spectroscopic study

Cited by 27 publications

References 24 publications

Mineralogy and crystallography of some Itokawa particles returned by the Hayabusa asteroidal sample return mission

Mineralogy and crystallography of some Itokawa particles returned by the Hayabusa asteroidal sample return mission

Alkalic parental magmas for chassignites?

Crystallography of hornblende amphibole in LAP04840 R chondrite and implication for its metamorphic history

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