浙江高岭土矿床中氢氧同位素的研究

浙江省是我国高岭土矿的产地之一,矿床主要集中于浙南火山岩地区。浙南地区广泛分布中生代的中酸性火山碎屑岩、熔岩及浅成侵入岩,构造断裂发育,气候温暖湿润,具有风化或热液作用形成高岭土矿床的有利地质条件。

THE STUDY ON HYDROGEN AND OXYGEN ISOTOPES OF KAOLIN DEPOSITS IN ZHEJIANG PROVINCE

This paper reports hydrogen and oxygen isotope data of kaolin deposits in Zhejiang Province. 14 kaolin mineralsamples from 9 kaolin deposits were collected and determined. The isotope evidences show that (1) the formation of kaolin deposits in Zhejiang Province was mainly due to the weathering process and supergene hydrothermal alteration. All of the genetic water associated with kaolin minerals were meteoric in origin: (2) On the basis of hydrogen and oxygen isotope compositions of kaolin minerals, the different genetic types of kaolin deposits may be distinguished as weathering type and liydrothermal type. (3) Kaolinite and dickite (and illite) remain essentially the original isotope compsoitions, but the isotopes in halloysite is easy to be exchanged with ambient water. Therefore, the hydrogen and oxygen isotope compositions of halloysite can not used sometimes as genetic evidences of kaolin deposits.