Wholly compatible and complementary patterns of rare-earth elements in Quaternary volcanic rocks from Oshima-Oshima and Oshima-Kojima isles, Japan

摘要: The REE abundances in one basalt and two andesites from Oshima-Oshima -Kojima isles, Hokkaido, Japan, were determined precisely by mass-spectrometric stable isotope dilution technique. abundance ratios between distinct volcanic rocks, i.e., andesite (old somma) (young somma), isle show a linear function of atomic number, with breaks at Z = 68 63 64. This can be interpreted as implying that the studied stand mutually conjugate relationship possible, previously concurrent liquid solid phases. Employing ratio an effective bulk partition coefficient function, retrogressive fractionation was theoretically followed back calculation for different FW* values. results suggest there stages concerning relevant functions development question terrace-shaped break 67 (Ho) worked prior to tri-segment obtained directly basalt.