Rare earth element determinations at ultratrace abundance levels in geologic materials

Koeberl, Christian; Kluger, F.; Kiesl, W.

doi:10.1007/bf02132380

Cited by 40 publications

(9 citation statements)

References 10 publications

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“…The procedures were checked and corrected by analyzing international geological reference materials (Govindaraju, 1987); precision and accuracy are below 10 rel% for almost all elements, and in most cases between 0.5 and 5 rel%. More details on the analytical procedures are given in Koeberl et al (1987) and Koeberl (1993).…”

Section: Analytical Techniquesmentioning

confidence: 99%

Mineralogical, petrological, and geochemical studies of drill core samples from the Manson impact structure, Iowa

Koeberl¹,

Reimold²,

Kracher³

et al. 1996

Special Paper 302 the Manson Impact Structure Iowa Anatomy of an Impact Crater

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The Manson crater is a 36-km-diameter, well-preserved, but buried, impact structure in the United States of America. In 1991 and 1992, 12 cores were drilled in a joint Iowa Geological Survey Bureau-USGS effort. We have sampled 11 of the 12 cores, as well as the two cores drilled in 1953. About 140 samples from these drill cores were studied for their petrographical and geochemical characteristics to accumulate a database for target rocks and impact lithologies present at the Manson crater. The results provide a complete petrographical and geochemical database for impactite and target lithologies at the Manson crater. A variety of impactite lithologies are present, consisting of impact melt rocks, suevites, and several different types of breccia, including an unusual impact melt breccia that contains melt in the matrix as well as some melt clasts. The composition of the impactites can be reproduced by mixtures of the different types of target rocks present. Our results from least-square mixing calculations show that the M1 impact melt breccia has been formed from a mixture of shale, Red Clastics, a mafic component ("amphibolite"), and granite, with minor contributions from carbonate and biotite granite. The results of the calculations indicate about 19% shale, 20% Red Clastics (sandstone, siltstone), 37% amphibolite gneiss, 3% biotite gneiss, and 19% granite for the M1 impact melt breccias. The calculations for the M1 suevite did not produce mixing proportions that were as well constrained as for the M1 impact melt breccias, but about 25% shale, 9% Red Clastics, 43% amphibolite gneiss, 4% biotite gneiss, and 17% granite are the best fit. The composition of the M11 melt breccias can be reproduced by about 19% shale, 25% Red Clastics, and 48% mafic gneiss components, with some contribution (7%) from the granitic target rocks. In addition, we have studied the composition of feldspars from the M1 drill core in comparison with feldspars from the Crow Creek Member in South Dakota, which had been proposed before to be a distal impact ejecta of the Manson crater. We find slight differences between the compositions of the two feldspar populations.

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Section: Analytical Techniquesmentioning

confidence: 99%

Mineralogical, petrological, and geochemical studies of drill core samples from the Manson impact structure, Iowa

Koeberl¹,

Reimold²,

Kracher³

et al. 1996

Special Paper 302 the Manson Impact Structure Iowa Anatomy of an Impact Crater

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show abstract

“…These samples were irradiated for 12 h in the research reactor at the University of Missouri at a flux of -5.5 x 1013 n/cm2-s. Additional bulk samples of the matrix were analyzed by INAA at the Institute of Geochemistry, University of Vienna using the procedures described by Koeberl et al (1987) and Koeberl ( 1993).…”

Section: Sampling and Analytical Techniquesmentioning

confidence: 99%

The South African polymict eucrite Macibini

Buchanan

Lindstrom

Mittlefehldt

et al. 2000

Meteorit & Planetary Scien

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Abstract-The polymict eucrite Macibini is a fragmental breccia, predominantly composed of eucritic materials with minor proportions (maximum 2 ~01%) of diogenitic material. Hence, it is intermediate between the Yamato-74 159-type polymict eucrites, which contain negligible amounts of magnesian orthopyroxene, and the howardites. The present study provides mineralogical and bulk compositional data for the meteorite breccia and for six clasts. These clasts include both volcanic and igneous rocks and a variety of impact-generated rocks. A broad range of degrees of postcrystallization metamorphism affected these materials before the final aggregation of the breccia.Clast A is a fragment of unequilibrated eucrite with subophitic texture. The edges of the zoned pyroxenes in this clast are composed of a host of Fe-rich augite containing vermicules (blebs) and lamellae composed of a mixture of Fe-rich olivine and silica. Similar features occur as fragments in lunar breccias and are attributed by some workers to the breakdown of pyroxferroite, an Fe-rich pyroxenoid. However, textures and compositions of these augite-olivine-silica intergrowths in clast A suggest that, in this case, they are the result of decomposition in a series of steps of Fe-rich subcalcic augite.Among the fragments of impact-generated material in Macibini is clast 2, an earlier-formed clastic breccia that was lithified before being broken apart and included in the meteorite breccia. Clast 3 is an impact-melt breccia that is composed of rock and mineral fragments in a devitrified groundmass. Clast C is also an impact-melt breccia that has a coarser-grained, homfelsic groundmass that resulted from extensive metamorphism after formation.

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“…Koeberl (1993) and Koeberl et al (1987) described the details of instrumentation, methodology, precision, and accuracy.…”

Section: Geochemical Analysesmentioning

confidence: 99%

Geology, petrography, shock petrography, and geochemistry of impactites and target rocks from the Kärdla crater, Estonia

Puura

Huber

Kirs

et al. 2004

Meteorit & Planetary Scien

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Abstract-The Kärdla crater is a 4 km-wide impact structure of Late Ordovician age located on Hiiumaa Island, Estonia. The 455 Ma-old buried crater was formed in shallow seawater in Precambrian crystalline target rocks that were covered with sedimentary rocks. Basement and breccia samples from 13 drill cores were studied mineralogically, petrographically, and geochemically. Geochemical analyses of major and trace elements were performed on 90 samples from allochthonous breccias, sub-crater and surrounding basement rocks. The breccia units do not include any melt rocks or suevites. The remarkably poorly mixed sedimentary and crystalline rocks were deposited separately within the allochthonous breccia suites of the crater. The most intensely shockmetamorphosed allochthonous granitoid crystalline-derived breccia layers contain planar deformation features (PDFs) in quartz, indicating shock pressures of 20-35 GPa. An apparent Kenrichment and Ca-Na-depletion of feldspar-and hornblende-bearing rocks in the allochthonous breccia units and sub-crater basement is interpreted to be the result of early stage alteration in an impact-induced hydrothermal system. The chemical composition of the breccias shows no definite sign of an extraterrestrial contamination. By modeling of the different breccia units with HMXmixing, the indigenous component was determined. From the abundances of the siderophile elements (Cr, Co, Ni, Ir, and Au) in the breccia samples, no unambiguous evidence for the incorporation of a meteoritic component above about 0.1 wt% chondrite-equivalent was found.

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Rare earth element determinations at ultratrace abundance levels in geologic materials

Cited by 40 publications

References 10 publications

Mineralogical, petrological, and geochemical studies of drill core samples from the Manson impact structure, Iowa

Mineralogical, petrological, and geochemical studies of drill core samples from the Manson impact structure, Iowa

The South African polymict eucrite Macibini

Geology, petrography, shock petrography, and geochemistry of impactites and target rocks from the Kärdla crater, Estonia

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