【摘要】 通过新建立的BiPO4转化法，笔者分析了白云鄂博矿区部分磷灰石的氧同位素组成，其变化范围为6．3‰～9．4‰，并通过与各种产状磷灰石及不同时代磷酸盐沉积的氧同位素对比、磷灰石形成温度的计算，以及磷灰石Sr－Pb同位素数据的分析，推断矿区磷灰石的形成可能与热水沉积作用有关。更多还原

【Abstract】 Oxygen isotopic composition of several apatite samples has been analyzed by means of newly established BiPO4-transformation procedure. The δ18OSMOW of apatites varies from 6. 3‰, to 9. 4‰ .On the basis of the comparison of oxygen isotopic characteristics between apatites of various occur-rences and phosphate sediments of different ages, the calculation of formation temperature and the constraint analysis of Sr-Rb isotopic data of apatites, the authors infer that the formation of Bayan Obo apatite might be related to the sedex process.更多还原