摘要
经对梁岙蜡石矿的氢氧同位素组成分布特征的研究,表明矿石的同位素组成在低温热液区中,靠近表生矿床区。矿物共存水的同位素组成落在雨水线上,从矿带中心至边部,共存水也由雨水热液渐变为雨水,且不受地开石化的影响。矿石的形成温度低(56—100℃),受样品在矿带中的部位所控制和受地开石化的影响。结合地质特征和大量测试资料,认为梁岙蜡石矿是热水湖盆沉积-改造(成岩期)形成的。
A study on the distributional features of the hydrogen-oxygen isotopic composition of the Liangao pyrophyllite deposit shows that the isotopic composition of the ores is near the hypergene deposit area with in the low-temperature hydrothermal domain. Isotopic composition of the mineral coexisting fluid falls on the rainwater line. The coexisting fluid also changes gradually from rainwater thermal solution in the centre of the ore belt into rainwater on the margin and it is not influenced by dickitization, The formation temperature of the ores is very low (56-100℃) and is controlled by the position of samples in the ore belt and influenced by dickitization. On the basis of this study as well as the geological characteristics of the deposit and the numerous data of analyses and tests, the author considers that the Liangao pyrophyllite deposit was formed by hot water lake-basin deposition-transformation (diagenctie stage).
