某些花岗岩中稀土元素赋存状态的研究

通过邓阜仙、老牛山和石家湾花岗岩稀土元素与主要氧化物之间逐步回归分析,认为岩石中稀土元素含量的变化主要和CaO成正相关关系。在此基础上,对富Ca矿物中稀土元素赋存能力的研究及有关岩体实际资料的分析表明,稀土元素主要赋存于榍石、褐帘石、磷灰石和锆石等副矿物中,并且这些副矿物的含量和组合特点的变化,基本上反映了岩石中稀土元素含量和配分型式的变化。这一研究,对探讨岩体的成因和演化具有重要意义。

RESEARCH ON THE RARE-EARTH ELEMENT EXISTENCE IN SOME GRANITES

As far as Dengfuxian, Laoniushan and Shijiawan granitic bodies are concerned, by the use of progressive regression analysis between REE and major oxides we have come to know that REE content is directly proportional to CaO in granites. Based on this, the study of concentrated REE capability of Ca-rich minerals and analyses of actual data of some granitic bodies have further shown that the REE are concentrated mainly in accessory minerals, such as titanite, orthite, apatite and zircon etc. , and content of these accessory minerals and different mineral assemblages reflect basically the content variations and distribution patterns of the REE in granites. Therefore we consider that the study of the existence of REE in accessory minerals and variations of the accessory mineral content in rocks is important in the researches on petrogenesis and evolution of granitic body.