山东梭罗树地幔橄榄岩微量元素的质子探针研究

The Study of Trace Element Using the Proton-Microprobe for Suoluosu Mantle Peridotite, Sandong Province

作者利用质子微探针和微束ＰＩＸＥ定量分析技术，对山东梭罗树地幔橄榄岩中橄榄石、斜方辉石、单斜辉石、尖晶石和石榴石等矿物的微量元素组成与分布进行了研究。结果表明，不相容元素（Ｓｒ，Ｙ，Ｚｒ）主要富集于单斜辉石内，尖晶石则几乎富集质子探针所能检出的所有微量元素，而石榴石中微量元素含量最少。研究表明，微区微量元素分布很不均匀，推测可能受地幔交代过程中溶液的渗滤效应以及存在微粒包裹体的共同制约。

Minerals in mantle peridotite from the Soulousu area, Sandong Province have been analysed on proton-microprobe for Ni, Zn, Ga, Rb, Sr, Zr, Y. The result shows that these elements are contained in specific acceptor minerals, such as olivine contains the highest Ni, orthopyoxene contains median Ni, and both they contains few Zn (Zn and Ni are compatible elements), while clinopyroxene has high incompatible elements (Sr, Zr, Y), spinel has high Ni, Zn and Ga, but garnet has fewest these elements. The inhomogeneous distribution of these elements is observed obviously in several hundred micron area of the minerals. This may result from the infilteration of fluids during mantle metasomatism and may be related to tiny inclusions enriched in specific elements.