(Table 1) Summary of magnetic properties and chemical composition of opaque minerals in DSDP Leg 58 Holes basallts

The Curie temperature and thermomagnetic behavior of wholerock samples were measured in basalts recovered from Sites 442, 443, and 444 of DSDP Leg 58 in the Shikoku Basin, and from Site 446 in the Daito Basin, north Philippine Sea. Chemical composition and microscopic features of opaque oxides in the same samples were also investigated. Degree and mode of oxidation of titanomagnetite vary irrespective of site, lithology, or magnetic polarity, and no systematic correlation has been found between any two of these characteristics. Magnetic properties are systematically different between massive flows recovered at Hole 444A (Shikoku Basin) and Hole 446A (Daito Basin), although the controlling factor is unknown.对四国盆地深海钻探计划（Deep Sea Drilling Project, DSDP）第58航次442、443、444站位以及菲律宾海北部大东盆地446站位所采集的玄武岩全岩样品，测定了其居里温度（Curie temperature）与热磁行为。同时对同一样品中的不透明氧化物的化学成分与显微特征开展了研究。钛磁铁矿（titanomagnetite）的氧化程度与氧化模式不受站位、岩性或磁极性的影响，且上述三类特征之间未发现任意两者间的系统性关联。尽管主控因素尚未明确，但四国盆地444A钻孔与大东盆地446A钻孔所获取的块状熔岩流的磁学性质存在系统性差异。