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Variations in the concentrations of trace elements at and near the subgrain-boundaries within olivine phenocrysts in an olivine-nephelinite were inspected with an electron microprobe. The olivine phenocrysts show homogeneous core (Fo85) surrounded by the Fe-richer rim. The core contains 160ppm Ti, 210ppm Al, 170ppm Cr and 140ppm Na, whereas the subgrain-boundary in the core contains 350ppm Ti, 310ppm Al, 490ppm Cr and 590ppm Na. The trace elements with their olivine/bulk-rock concentrationdoi:10.2343/geochemj.20.17 fatcat:qyt6dpl7nncyvplqf4fxgsjwym