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海南岛三亚湾表层沉积物中存在着氧化态不同的三种自生铁矿物:海绿石、菱铁矿和黄铁矿。海绿石是本区分布最广泛的自生矿物,形态主要呈团粒状。菱铁矿多呈直径为80—200μ的微球体或微球的连生体。黄铁矿多呈莓球状充填于有孔虫壳腔内。这三种铁矿物分别富集在不同的沉积相中,在丰度的空间变化上彼此呈不显著的负相关。它们的形成条件虽有较大差异,但有时可在同一样品中共生,因此,微环境的变化对它们的形成有重要作用。
There are three kinds of spontaneous iron minerals with different oxidation states in the sediments of Sanya Bay in Hainan Island: glauconite, siderite and pyrite. Glauber’s stone is the most widely distributed authigenic mineral in this area, mainly in the form of pellets. Siderite mostly microspheres or microspheres with a diameter of 80-200μ in the body. Pyrite mostly raspberry spherical filled foraminiferal shell cavity. The three iron minerals are enriched in different sedimentary facies, respectively, and have no significant negative correlation with each other in the spatial variation of abundance. Although their forming conditions are quite different, they can sometimes coexist in the same sample. Therefore, the change of the microenvironment plays an important role in their formation.