Remobilisation of the continental lithosphere by a mantle plume: major-, trace-element, and Sr-, Nd-, and Pb-isotope evidence from picritic and tholeiitic lavas of the Noril'sk District, Siberian Trap, Russia
Article Abstract:
Drill core (core SG-9) and surface exposure help in sampling the Late Permian to Early Triassic Siberian Traps. The isotope and trace element features of the Mesozoic high- and low-Ti flood basalts associated with the break-up of Gondwanaland are shown by the flood basalts of the Siberian Traps at Noril'sk. Sr-, Nd- and Pb-isotope data and new major and trace element data from the two sequences of stratigraphically controlled lavas are presented. The Noril'sk lavas are different from the main Siberian Trap sequence.
Publication Name: Contributions to Mineralogy and Petrology
Subject: Earth sciences
ISSN: 0010-7999
Year: 1993
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Ages, rare-earth element enrichment, and petrogenesis of tholeiitic and alkalic basalts from Kahoolawe Island, Hawaii
Article Abstract:
The petrographic, petrologic, geochemical and K-Ar analyses of the volcanics at Kahoolawe Island, Hawaii show that the basaltic shield volcano is made up of intercalated tholeiitic and alkalic basalts which have undergone stratification through fractional crystallization. Kahoolawe lavas in the potshield stage exhibit compositional variations, high rare earth element levels and yttrium levels. In addition, the shield volcano features rejuvenated-stage basaltic assemblages from tholeiitic, shield-like magma.
Publication Name: Contributions to Mineralogy and Petrology
Subject: Earth sciences
ISSN: 0010-7999
Year: 1992
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Experimental constraints on the low-pressure evolution of transitional and mildly alkalic basalts: multisaturated liquids and coexisting augites
Article Abstract:
The melting relations of tholeiitic, transitional and mildly alkalic basalts and ferrobasalts are analyzed, with emphasis on the constraints of liquid-augite relations on the liquid lines of descent. Results show that coexisting augites show a variation from nepheline to hypersthene normative compositions under pseudo-quaternary projections. Therefore, the normative tetrahedron approximates pseudo-quaternary systems for basalt petrogenesis and evolution.
Publication Name: Contributions to Mineralogy and Petrology
Subject: Earth sciences
ISSN: 0010-7999
Year: 1992
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- Abstracts: Evidence for the multiple stage evolution of the subcontinental lithospheric mantle beneath the Eifel (Germany) from pyroxenite and composite pyroxenite/peridotite xenoliths
- Abstracts: Discussion of "Temporal evolution of the Kerguelen plume: geochemical evidence from approximately 38 to 82 Ma lavas forming the Ninetyeast Ridge" by F.A. Frey and D. Weis
- Abstracts: Geochemical evolution and tectonic significance of boninites and tholeiites from the Koh ophiolite, New Caledonia
- Abstracts: Constraining continental structure by integrating Os isotopic ages of lithospheric mantle with geophysical and crustal data: an example from southeastern Australia
- Abstracts: Mildly peraluminous high-silica granites in a continental rift: the Drammen and Finnemarka batholiths, Oslo Rift, Norway