Results 121 to 130 of about 16,578 (144)
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Geochemistry of ultramafic and calc-llkaline lamprophyres from the Lac Shortt area, Quebec
Mineralogy and Petrology, 1991Petrographic and geochemical data are presented for the Lac Shortt lamprophyre dyke swarm. The primary mineralogy in all samples has been largely destroyed either by alteration at the time of emplacement or by subsequent metamorphism. Most of the dykes are ultramafic lamprophyres.
J. H. Bourne, J. Boss�
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Mineralogy and Petrology, 1993
Dykes of alkaline and ultramafic carbonate lamprophyres (monchiquite-ouachitite and aillikite) intrude the Carboniferous sediments of Central Bohemia. Their characteristic feature is the presence of substantial amounts of a sodalite group mineral (presumably hauyne), carbonate and barite. Isotopic compositions ofδ13C (−3.4 to −6.2‰) andδ18O ( + 13.5 to
J. Ulrych +4 more
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Dykes of alkaline and ultramafic carbonate lamprophyres (monchiquite-ouachitite and aillikite) intrude the Carboniferous sediments of Central Bohemia. Their characteristic feature is the presence of substantial amounts of a sodalite group mineral (presumably hauyne), carbonate and barite. Isotopic compositions ofδ13C (−3.4 to −6.2‰) andδ18O ( + 13.5 to
J. Ulrych +4 more
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Geochemistry and petrology of ultramafic lamprophyres from Schirmacher Oasis, East Antarctica
Mineralogy and Petrology, 1999Petrographic and geochemical data are presented for some ouachitites from the Schirmacher Oasis. The studied dike intruded into the metamorphic basement of the East Antarctic craton. The ouachitite samples contain substantial amounts of zoned phlogopite and diopsidic to salitic pyroxene as phenocrysts.
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Geologische Rundschau, 1981
Alkahne ultramafic lamprophyres and associated carbonatite dykes form north-south trending dyke swarms. The lamprophyres are sub-divided into micaceous, picritic and breccia varieties. Carbonatites sensu stricto (beforsites) occur very subordinate.
Peter Kresten +2 more
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Alkahne ultramafic lamprophyres and associated carbonatite dykes form north-south trending dyke swarms. The lamprophyres are sub-divided into micaceous, picritic and breccia varieties. Carbonatites sensu stricto (beforsites) occur very subordinate.
Peter Kresten +2 more
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Petrogenesis of ultramafic lamprophyres and carbonatites of the Alnö complex (central Sweden)
Goldschmidt2022 abstracts, 2022Lukáš Krmíček +4 more
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Mineralogical Magazine, 2000
AbstractAn ultramafic lamprophyre dyke is described from the otherwise tholeiitic Ferrar magmatic province of Antarctica. We report an Ar-Ar age of 183 ± 2.2 Ma for the dyke, indistinguishable from those of the Ferrar tholeiites. However, the dyke has mineralogical and major and trace element compositions, and radiogenic isotopes ratios, very different
Leat, P.T. +4 more
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AbstractAn ultramafic lamprophyre dyke is described from the otherwise tholeiitic Ferrar magmatic province of Antarctica. We report an Ar-Ar age of 183 ± 2.2 Ma for the dyke, indistinguishable from those of the Ferrar tholeiites. However, the dyke has mineralogical and major and trace element compositions, and radiogenic isotopes ratios, very different
Leat, P.T. +4 more
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Geochemistry of phlogopites in ultramafic xenoliths of lamprophyre dykes (Alcsutdoboz, Hungary)
Neues Jahrbuch für Mineralogie - Abhandlungen, 1989I. Kubovics, Cs. Szabó, K. Sólymos
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The Nature and Origin of Ultramafic Lamprophyres: Aln ites and Allied Rocks
Journal of Petrology, 1986openaire +1 more source
GEOCHEMISTRY AND SR-ND ISOTOPIC COMPOSITIONS OF PERMIAN ULTRAMAFIC LAMPROPHYRES IN SOUTHERN ILLINOIS
Geological Society of America Abstracts with Programs, 2016Anton H. Maria +2 more
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