Spadea, Piera; Beccaluva, L; Civetta, L; Coltorti, Massimo; Dostal, J; Sajona, F G; Serri, G; Vaccaro, C; Zeda, O (1991): (Table 4) Major element content and atomic proportions of Cr-spinel, magnetites and ilmenites from Sulu basement rocks and Cagayan Ridge volcanics. PANGAEA, https://doi.org/10.1594/PANGAEA.762176, In supplement to: Spadea, P et al. (1991): Petrology of basic igneous rocks from the floor of the Sulu Sea. In: Silver, EA; Rangin, C; von Breymann, MT; et al. (eds.), Proceedings of the Ocean Drilling Program, Scientific Results, College Station, TX (Ocean Drilling Program), 124, 251-269, https://doi.org/10.2973/odp.proc.sr.124.158.1991