上地幔交代氧化物及其相关矿物──金伯利岩中复杂氧化物的相互关系及地幔交代作用探讨

用微束分析和微区图像分析技术，研究了山东金伯利岩中沂蒙矿（系列）、蒙山矿（系列）、桂红石、Zr－REE－Ti氧化物、钛铁矿（富镁）、钙钛矿和亚铁板钛矿的成分、产出特征和相互关系。这些关系包括：①镁钛铁矿-尖晶石的固溶体分离及伴生的交代作用──沂蒙矿的形成；②蒙山矿的熔融交代作用及其形成的亚铁板钛矿；③斑点、微脉交代充填作用及其形成的柱红石、Zr－REE－Ti氧化物等新矿物相。通过研究，总结了上地幔中与氧化物矿物相关的一些显交代作用的规律，提出了上地幔中不相容元素的显交代作用可分为早、中、晚三期。这些为地幔流体交代作用的总成分目录和机理作出了重要的补充。

OXIDES AND RELATED MINERALS IN UPPER MANTLE-RELATIONSHIP AMONG COMPLEX OXIDES IN KIMBERLITES AND AN INVESTIGATION ON METASOMATISM IN UPPER MANTLE

The composition, assemblage, and relationship of yimengite (series ), mathieasite (se-ries), priderite, Zr-REE-Ti oxide, ilmenite (Mg-rich), perovskite, and ferropsudobrookite have been studied with micro-beam and micro-area image analysis- The studies include: (1) sub-solid separation of ilmenite and spinel, the accompanying metasomatism, and the formation of yimen-gite; (2) melting and metasomatism of mathieasite and ferropsudobookite; (3) the metasomes in veins and spots: priderite, Zr-Ti oxide and some new mineral phases which contain REE and Ti.The investigatiort shows that there exist some regulations re1ated to the.obvious metasomatism of oxides in the upper mantle. Three stages of metasomatism (early, middle, and late) are recog-nized.