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用X射线衍射法测试了1988年取自西菲律宾海3个柱样共52个沉积物样品的矿物组成。结果表明，沉积物中主要矿物为方解石、石英、斜长石和钾长石，次要矿物为高岭石、绿泥石、角闪石、斜发沸石、水云母、蒙脱石和滑石。划分出两类矿物组合：（1）方解石＋石英＋斜长石＋钾长石，水云母含量高，角闪石、斜发沸石和滑石含量低；（2）叙长石＋方解石＋石英＋钾长石，角闪石、斜发沸石和滑石含量高，水云母含量低。（1）类矿物组合反映陆源物质较多，火山沉积作用较弱；（2）类组合反映火山沉积物较多，陆源物质较少。矿物组合的变化还具有地层学意义，并可反映古气候的演化。
The mineral composition of a total of 52 sediment samples taken from three column samples in the West Philippine Sea in 1988 was tested by X-ray diffraction. The results show that the main minerals in the sediments are calcite, quartz, plagioclase and potash feldspar, and the secondary minerals are kaolinite, chlorite, amphibole, clinoptilolite, hydrous mica, montmorillonite and talc. There are two types of mineral assemblages: (1) calcite + quartz + plagioclase + potassium feldspar with high hydromonite content, low amphibole, clinoptilolite and talc content; (2) Synethyrite + calcite + quartz + Potash feldspar, amphibole, clinoptilolite and talc high content, low water mica content. (1) Mineral assemblages reflect more terrestrial materials and less volcanic sediments. (2) The assemblages reflect more volcanic sediments and less terrigenous materials. Changes in mineral assemblages also have stratigraphic significance, and can reflect the evolution of paleoclimate.