Mechanism of metal transportation on the Obira type tin mineralization.

从岩浆活动与成矿作用的关系方面对九州大平型锡矿化进行了地球化学研究。通过本研究项目获得了以下知识.与成矿关系密切的花岗质岩石氯含量较高。预计岩浆在结晶过程中也会富含氯。2.在成矿早期沉淀的含水矿物中氯含量显著丰富。这表明，原生矿溶液中的氯含量也很高。矿石中含水矿物的含氯量随成矿作用的进行而急剧降低，而氟含量则基本不变。这说明含金属氯岩浆是被陨石纯水稀释后，通过与氯络合物的分解而沉淀出来的。

Geochemical research has been done on the Obira type tin mineralization in Kyushu, from the aspect of the relationship between magmatism and mineralization. The following knowledge were obtained through this research project.1. The chlorine content of granitic rock closely related with mineralization is relatively high. The magma is also expected to be rich in chlorine during crystallization.2. The hydrous minerals that precipitated at early stage of mineralization are remarkably rich in chlorine. It suggests that the primary ore solution was also high in chlorine.3. Chlorine content of hydrous minerals in ore decreases steeply with advancing the mineralization, in spite of almost same in fluorine. It suggests that metal-chlorine-bearing magmatic was diluted with meteoritic pure water, and that metal precipitated by the decomposition of complex with chlorine.