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Browsing by Author "Nikkola, Paavo"

Browsing by Author "Nikkola, Paavo"

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    Formation of segregation structures in Hafnarhraun pāhoehoe lobe, SW Iceland: a window into crystal–melt separation in basaltic magma 
    Nikkola, Paavo; Thordarson, Thorvaldur; Rämö, O. Tapani; Heikkilä, Pasi (Springer Science and Business Media LLC, 2019-11-25)
    To gain insights into crystal–melt separation processes during basalt differentiation, we have studied an 8-m-thick pāhoehoe lava lobe from the Hafnarhraun lava flow field in SW Iceland. The lobe has abundant melt segregations, porous cylindrical and ...
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    From partial melting to lava emplacement: the petrogenesis of some Icelandic basalts 
    Nikkola, Paavo (Faculty of Science, University of Helsinki; Faculty of Earth Sciences, University of Iceland, 2020-03-20)
    This thesis provides insights into the petrogenesis of Iceland basalts via three subprojects. The first uses olivine macrocrysts as a proxy for mantle melting conditions below Iceland, the second utilizes petrological thermobarometry to resolve the ...
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    Signature of deep mantle melting in South Iceland olivine 
    Nikkola, Paavo; Guðfinnsson, Guðmundur; Bali, Eniko; Rämö, O. Tapani; Fusswinkel, Tobias; Thordarson, Thorvaldur (Springer Science and Business Media LLC, 2019-05)
    We present new high-precision major and trace element data on olivine macrocrysts from various volcano-tectonic settings in Iceland and use these data as a proxy for mantle mode and melting conditions. Within individual sampling sites examined (seven ...