Allende, Mexico, Meteorite Shower

Clarke, Roy S.; Jarosewich, E.; Mason, Brian; Nelen, J.; Gómez, Manuel J.; Hyde, Jack R.

doi:10.5479/si.00810274.5.1

Cited by 101 publications

(104 citation statements)

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“…These represent substantial enrichments relative to their concentrations in C3's, 9-12 ppm Zr and 2-3 ppm Y (CLARKE et al, 1970). EHMANN and REBAGAY (1970) have reported average Zr and Hf concentrations in 'white inclusions' from Allende of 24 ppm and 0.36 ppm, as compared to abundances in the black matrix of 1.6 ppm and 0.14 ppm, respectively.…”

Section: Condensation Of the Refractory Elementsmentioning

confidence: 99%

“…The slightly lower Sm and Yb ~on~entratio~ found in this study may be due to the adoption of low concentrations of these elements in the silicate standards. CLARKE et al (1970) have described gehlenite-spinel-perovskite-bearing chondrules from Allende. In a systematic study of the abundances of 15 elements in 61 individual Allende chondrules, WARREN (1971) has analyzed one containing 17.4 per cent Al, 12.1 per cent Cu and 1.25 per cent Ti (A in Table 6 of this study) and another containing 13.6 per cent Al, 19.7 per cent Ca and 0.74 per cent Ti (B in Table 6).…”

Section: Accuracymentioning

confidence: 99%

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Refractory trace elements in Ca-Al-rich inclusions in the Allende meteorite

Grossman

1973

Geochimica et Cosmochimica Acta

131

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Abstract-The condensation temperatures are calculated for a number of refractory trace metals from a gas of solar composition at 10e3 and 1O-4 atm. total pressure. Instrumental neutron activation analysis of C&Al-rich inclusions in the Allende carbonaceous chondrite reveals enrichments of 22.8 f 2.2 in the concentrations of Ir, SC and the rare earths relative to Cl chondrites. Such enrichments cannot be due to magmatic differentiation processes because of the marked differences in chemical behavior between Ir and SC, exhibited by their distributions in terrestrial igneous rocks and meteorites. All of these elements should have condensed from a cooling gas of solar composition above or within the range of condensation temperatures of the major mineral phases of the inclusions, which suggests that these inclusions are hightemperature condensates from the primitive solar nebula. Gas-dust fractionation of these materials may have been responsible for the depletion of refractory elements in the ordinary and enstatite chondrites relative to the carbonaceous chondrites.

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Section: Condensation Of the Refractory Elementsmentioning

confidence: 99%

Section: Accuracymentioning

confidence: 99%

Refractory trace elements in Ca-Al-rich inclusions in the Allende meteorite

Grossman

1973

Geochimica et Cosmochimica Acta

131

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“…[25] and Clarke ej^ aT. [24] have noted the similarity between the composition and mineralogy of the aggregates and the early condensates in a cooling nebula. It is extremely unlikely that the pecularities of these inclusions could be a result of igneous differentiation processes acting on material of solar or chondritic composition.…”

Section: Properties Of the Early Condensatementioning

confidence: 99%

“…The concentrations of the trace element refractories have been determined for the Ca-Al inclusions by Cast et^ al, r [26] and Grossman [21] and for the whole meteorite by Mason and Graham [24] and Wakita and Schmitt [35].…”

Section: Trace Elementsmentioning

confidence: 99%

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The composition and origin of the moon

Anderson

1973

Earth and Planetary Science Letters

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Evaluation of the utility of handheld XRF in meteoritics

Zurfluh¹,

Hofmann

Gnos

et al. 2011

X-Ray Spectrometry

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We tested a handheld X‐ray fluorescence instrument with adaptable matrix correction for its suitability in meteoritics. We report here the instrument setup, precision and accuracy and present examples of applications. With a measuring time of 300 s, it is possible to collect accurate data for K, Ca, Ti, Cr, Mn, Fe, Co, Ni, Sr and Ba that are needed for the identification of doubtful meteorites and the nondestructive classification of chondrites and achondrites. The factory‐supplied calibration curve of the instrument was fine tuned for our purposes with the use of well‐analyzed meteorite powders, pressed pellets and meteorite hand specimens as standards. Relative errors of 10% to 20% are reached for the mentioned elements. The instrument was tested in the hot desert of Oman while searching for meteorites and also in the laboratory while doing research on meteorites. The main applications of the instrument are the identification and classification of meteorites, the quantification of terrestrial elemental contamination (Sr and Ba) and detection of Mn‐rich desert varnish. It is possible to discriminate the major meteorite groups using Fe/Mn and Ni values. Handheld X‐ray fluorescence is also useful in identifying meteorites belonging to the same fall event. Copyright © 2011 John Wiley & Sons, Ltd.

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Allende, Mexico, Meteorite Shower

Cited by 101 publications

References 0 publications

Refractory trace elements in Ca-Al-rich inclusions in the Allende meteorite

Refractory trace elements in Ca-Al-rich inclusions in the Allende meteorite

The composition and origin of the moon

Evaluation of the utility of handheld XRF in meteoritics

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