High Ni and low Mn/Fe in olivine phenocrysts of the Karoo meimechites do not reflect pyroxenitic mantle sources

• Published in: Chemical Geology
• Main Authors: Heinonen, Jussi S., Fusswinkel, Tobias
• Other Authors: Department of Geosciences and Geography
• Format: Article in Journal/Newspaper
• Language: English
• Published: Elsevier Scientific Publ. Co 2017
• Subjects: Other natural sciences; Karoo magmatism; LARGE IGNEOUS PROVINCE; CONTINENTAL FLOOD BASALTS; picrite; Olivine; PYROXENITE; Geosciences; Physical sciences; Antarctic; Korkea; The Antarctic; Antarc*
• Online Access: http://hdl.handle.net/10138/222499

Nickel contents and Mn/Fe in olivine phenocrysts have been suggested to reflect the mineral composition of the mantle source of the host magma. This hypothesis is tested here against a well-characterized suite of meimechitic (or Ti-rich komatiitic) dikes from the Antarctic extension of the Jurassic...