Blar i forfatter "Stracke, Andreas"

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    • Evolution of ultrapotassic volcanism on the Kaapvaal craton: deepening the orangeite versus lamproite debate 

      Tappe, Sebastian; Shaikh, Azhar M.; Wilson, Allan H.; Stracke, Andreas (Journal article; Tidsskriftartikkel; Peer reviewed, 2021-08-02)
      Orangeites are a significant source of diamonds, yet ambiguity surrounds their status among groups of mantle-derived potassic rocks. This study reports mineralogical and geochemical data for a c. 140 Ma orangeite dyke swarm that intersects the Bushveld Complex on the Kaapvaal craton in South Africa. The dykes comprise distinctive petrographic varieties that are linked principally by olivine ...

    • Plume–lithosphere interactions and LIP-triggered climate crises constrained by the origin of Karoo lamproites 

      Tappe, Sebastian; Ngwenya, Ntando S.; Stracke, Andreas; Romer, Rolf L.; Glodny, Johannes; Schmitt, Axel K. (Journal article; Tidsskriftartikkel; Peer reviewed, 2023-04-20)
      We identified a ca. 180 Ma diamondiferous lamproite event in Zambia, establishing a link between ultrapotassic volcanism and the early Jurassic Karoo flood basalt province of sub-Saharan Africa. The cratonic lamproites erupted through the Permo–Triassic Luangwa Rift structure, but MgO-rich ultrapotassic magma formation was unrelated to rifting and triggered by plume–lithosphere interactions during ...

    • Sheared Peridotite and Megacryst Formation Beneath the Kaapvaal Craton: A Snapshot of Tectonomagmatic Processes across the Lithosphere-Asthenosphere Transition 

      Tappe, Sebastian; Massuyeau, Malcolm; Smart, Katie A; Woodland, Alan B; Gussone, Nikolaus; Milne, Sarah; Stracke, Andreas (Journal article; Tidsskriftartikkel; Peer reviewed, 2021-05-27)
      The cratonic lithosphere–asthenosphere boundary is commonly invoked as the site of sheared peridotite and megacryst formation, a well-recognized petrological assemblage whose genetic relationships—if any—remain poorly understood. We have undertaken a comprehensive petrology and Sr–Nd–Hf–Ca isotope study of sheared peridotite xenoliths and clinopyroxene megacrysts from the c. 1150 Ma Premier kimberlite ...