摘要
笔者在深入研究平阳矾山明矾石矿床野外工作的基础上，总结出实验地质依据。采用矿区未蚀变的火山碎屑岩和凝灰岩作为试料，分别模拟配制ｐＨ＝０．５、１．０、１．５和２．０的Ｈ２ＳＯ４（１２．５％、２．５％１０．５％和０．１％）＋０．４ｍｏｌＫＦ＋０．１ｍｏｌＮａＣｌ水溶液作为晚期火山气热液，两者在高压釜中持续１２０ｈ的交代作用。
Based on an intensive field study of the Fanshan alunite deposit and summing-up of the geological grounds of the experiments, the authors, using unaltered pyroclastic rocks and tuffs closely related to mineralization in the mine as starting materials, made separate simulating preparations for later volcanic gas-hydrothermal solutions of H2SO4(12. 5, 2. 5, 0. 5, and 0. 1%) + 0. 4 mol KF + 0. 1 mol NaCl of pH = 0. 5, 1.0, 1. 5 and 2. 0 which were used as reactive solutions for the experiments.All experiments were performed in instruments of quenching and the Bridgman sealed pressure vessels at high temperatures and high pressures. Experimental starting materials and reactive solutions were sealed in gold or silver test tubes, and placed in the reactive cavities of high pressure vessels which were situated in the constant temperature areas of experimental furnaces. Experimental temperatures were controlled with automatic fine temperature controllers TWK-703 (error±2 C ). Experimental pressures were manifested in manometers or were calculated according to the filling degrees of P-V-T relations of Kennedy G. C. Experimental products were studied under the microscope and by X-ray analysis.Experimental results show that the Fanshan alunite deposit in Pingyang was formed by selective metasomatism of alkali-feldspars in tuff, phcnocrysts and clastic fragments by S-, K- and Na-bearing acid volcanic gas-hydrothermal solutions along the passageway of the interstratified fissures, intrastratal pores and mineral cleavages of earlier-formed pyroclastic rocks, tuffs and tuffaceous conglomerate in the oxidation environment at 212 - 487 C and 200×105 - 800 ×105 Pa.
出处
《地质学报》
EI
CAS
CSCD
北大核心
1998年第2期162-172,共11页
Acta Geologica Sinica
基金
中国地质科学院资助的"浙江平阳矾山明矾石矿床形成条件和其综合利用研究"课题部分研究成果。
关键词
实验研究
成矿机理
矾山
明矾石矿床
experimental study
mineralization mechanism
Fanshan alunite deposit
Pingyang
Zhejiang
