Origin of anomalous rare-earth element and yttrium enrichments in subaerially exposed basalts: Evidence from French Polynesia

Cotten, Joseph; Dez, Alain Le; Bau, Michael; Caroff, Martial; Maury, R.; Dulski, Peter; Fourcade, Serge; Bohn, Marcel; Brousse, Robert

doi:10.1016/0009-2541(94)00102-e

Cited by 323 publications

(154 citation statements)

References 61 publications

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“…The concentrations of Ti, Al, Cr, Fe, Mn, Mg, Ca, Na, P, Co and Ni were determined by ICP-AES (inductively coupled plasma-atomic emission spectrometry) using a Horiba Jobin Yvon Ultima 2 spectrometer following the procedure of Cotten et al (1995). Aliquots of mother solutions containing the equivalent of 50 mg of samples were used for the determination of the concentrations of these elements.…”

Section: Bulk Rock Compositionsmentioning

confidence: 99%

Geochemistry of CI chondrites: Major and trace elements, and Cu and Zn Isotopes

Barrat

Zanda

Moynier

et al. 2012

Geochimica et Cosmochimica Acta

322

285

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In order to check the heterogeneity of the CI chondrites and determine the average composition of this group of meteorites, we analyzed a series of 6 large chips (weighing between 0.6 and 1.2 g) of Orgueil prepared from 5 different stones. In addition, one sample from each of Ivuna and Alais were analyzed. Although the sizes of the chips used in this study were "large", our results show evidence for minor chemical heterogeneity in Orgueil, particularly for alkali elements and U. After removal of one outlier sample, the spread of the results is considerably reduced. For most of the 46 elements analyzed in this study, the average composition calculated for Orgueil is in very good agreement with previous CI estimates. This average, obtained with a "large" mass of samples, is analytically homogeneous and is suitable for normalization purposes.Finally, the Cu and Zn isotopic ratios are homogeneously distributed within the CI parent body with a spread of less than 100 ppm per atomic mass unit (amu).

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Section: Bulk Rock Compositionsmentioning

confidence: 99%

Geochemistry of CI chondrites: Major and trace elements, and Cu and Zn Isotopes

Barrat

Zanda

Moynier

et al. 2012

Geochimica et Cosmochimica Acta

322

285

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“…K was analyzed by ICP-AES (Cotten et al, 1995) with a relative precision of 1%. A description of the unspiked technique and the instrument used for Ar measurements is presented elsewhere (Charbit et al, 1998).…”

Section: The Unspiked K/ar Technique and Samplesmentioning

confidence: 99%

New K–Ar age determinations of Kilimanjaro volcano in the North Tanzanian diverging rift, East Africa

Nonnotte

Guillou

Gall

et al. 2008

Journal of Volcanology and Geothermal Research

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The Kilimanjaro is the African highest mountain and culminates at 5895 m high. This huge volcanic edifice is composed of three main centres along a N110°E-striking axis (Shira, Kibo and Mawenzi from W to E), and emplaced in a key area where a major N80°E-oriented volcanic lineament intersects a first-order NW-SE basement fault-like discontinuity.Seventeen K-Ar ages (on microcrystalline groundmass) acquired on lavas and intrusive facies from the three eruptive centres confirm that the Plio-Quaternary volcanicity of Kilimanjaro is clearly polyphased. The oldest phases of volcanic activity begun at ~2.5 Ma in the Shira vent and our data suggest that the latest important phases occurred around 1.9 Ma, just before the collapse of the Northern part of the edifice. Magmatic activity then shifted eastwards in the

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“…Ten abyssal peridotitic rocks and one of basaltic dyke sample were selected for the analyses of major elements, trace elements (Table 1), including Re, Pt, and Os contents, and Os isotopic ratios (Table 2). The chemical analyses were performed at CNRS-Université de Bretagne Occidentale, France, following the protocol described in Cotten et al (1995).…”

Section: Geochemistry Of the Abyssal Peridotitementioning

confidence: 99%