Journal ArticleDOI
Rare-earth abundances in chondritic meteorites
TLDR
In this article, 15 chondrites, including eight carbonaceous chondites, were analyzed for rare earth element abundances by isotope dilution, and the persistence of anomalies in chondritic materials relatively removed from direct condensational processes implies that anomalous components were introduced at a late stage of chondrite formation.About:
This article is published in Geochimica et Cosmochimica Acta.The article was published on 1978-08-01. It has received 1346 citations till now. The article focuses on the topics: Chondrule & Chondrite.read more
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Archaean phosphates: a case study of transformation processes in apatite from the Barberton greenstone belt
Łukasz Birski,Ewa Słaby,Richard Wirth,Monika Koch-Müller,Klaus Simon,Alicja Wudarska,Alicja Wudarska,Jens Götze,Aivo Lepland,Aivo Lepland,Axel Hofmann,A. Kuras +11 more
TL;DR: In this paper, three generations of phosphates can be distinguished from the obtained results, and the results indicate that apatites in this group lack any visible indicators of secondary alterations at the micro- and nanoscales.
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High-temperature density of lanthanide-bearing Na-silicate melts: Partial molar volumes for Ce2O3, Pr2O3, Nd2O3, Sm2O3, Eu2O3, Gd2O3, Tb2O3, Dy2O3, Ho2O3, Er2O3, Tm2O3, and Yb2O3
TL;DR: In this paper, the densities of various lanthanide-bearing Na-silicate melts distributed along various binary joins, where the end-members are Na-disilicate and one of the lanthanides sesquioxides (i.e., Ce 2 O 3, Pr 2 O 4, Nd 2 O 5, Sm 2 O 7, Eu 2 O 6 ), have been measured using the double-bob Archimedean method.
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The Ticunzal Formation in central Brazil: Record of Rhyacian sedimentation and metamorphism in the western border of the São Francisco Craton
TL;DR: The Ticunzal Formation as mentioned in this paper is exposed in the northern portion basement of the external zone of the Brasilia Fold Belt and corresponds to a sequence of biotite-garnet paragneisses and mica-graphite schists with mineral assemblages indicating retrograde metamorphism under greenschist facies conditions.
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Geochemical consequences of flow differentiation in a multiple injection dike (Trinity ophiolite, N. California)
TL;DR: In this article, a clinopyroxene-rich dike of the Trinity ophiolite sheeted-dike complex shows three different magmatic pulses, probably injected in a short period of time (no well developed chilled margin) and important variations of the clinopyronene and plagioclase percentages between its core (highly porphyritic) and margins (aphyric).
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Silurian turbidites used to reconstruct a volcanic terrain and its Mesoproterozoic basement in the Irish Caledonides
TL;DR: The Lettergesh Formation, Co. Galway, Ireland, comprises a 1.5 km thick sequence of turbidites deposited c. 430 Ma ago during closure of the Iapetus Ocean as discussed by the authors.
References
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Book
Advanced Inorganic Chemistry
TL;DR: Cotton and Wilkinson's Advanced Inorganic Chemistry (AIC) as discussed by the authors is one of the most widely used inorganic chemistry books and has been used for more than a quarter century.
Journal ArticleDOI
Synthesis of the Elements in Stars
TL;DR: In this article, a count of the stable and radioactive elements and isotopes is given, and Table I,1 shows that only promethium has not been found in nature, whereas 99 elements are found terrestrially and technetium is found in stars.
Journal ArticleDOI
Determination of REE, Ba, Fe, Mg, Na and K in carbonaceous and ordinary chondrites
TL;DR: In this paper, the exact determination of REE and Ba abundances in three carbonaceous (Orgueil Cl, Murchison C2 and Allende C3) and seven olivine-bronzite chondrites were carried out by mass spectrometric isotope dilution technique.
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A chemical-petrologic classification for the chondritic meteorites.
W. R. Van Schmus,John A. Wood +1 more
TL;DR: In this article, a two-dimensional classification grid based on chemical and petrologic subdivisions of chondritic meteorites is proposed, which extends the current chemical subdivisions to account for varying petrolic (implied metamorphic) properties within the primary chemical groups.