XRF analyses of Sanbagawa pelitic schists in central Shikoku, Japan

Abstract

This paper lists the XRF major and trace element (Rb, Sr, Y, Zr, Nb, Ba, Th, Pb, and Ni) analyses of 198 Sanbagawa pelitic schists along with their mineral assemblages. These data give the following average composition of the Sanbagawa pelitic schist (1 σ of standard deviations in parentheses): Major element in weight percent; SiO2, 68.94 (3.17); TiO2, 0.55 (0.10); Al2O3, 15.12 (1.22); Fe2O3, 4.49 (1.07); MnO, 0.14 (0.08); MgO, 1.68 (0.51); CaO, 0.99 (0.75); Na2O, 2.47 (0.83); K2O, 3.02 (0.55); P2O5 0.11 (0.02); loss of ignition, 2.14 (0.62); Trace element in ppm; Rb, 119 (21); Sr, 129 (60); Y, 21.1 (4.7); Zr, 144 (17); Nb, 9.6 (1.4); Ba, 486 (103); Th, 12.7 (2.1); Pb, 18.7 (5.7); Ni, 15.7 (11.0). The Sanbagawa pelitic schists are characterized geochemically by the narrow mg-value (=molar MgO/(MgO+FeO)) of 0.422 (0.031), K/Rb weight ratio of 211 (15), and K/Ba weight ratio of 52.3 (6.5).