秋田油田における自生鉱物,特に沸石,珪酸鉱物の形成に関する速度論的考察

概要

論文の詳細を見る
In Akita oil field, the zonal distribution of zeolites and silica minerals is recognized in the Neogene marine sediments succesively from younger to older strata; clinoptilolite and analcime, and cristobalite and quartz respectively. Generally these minerals in younger sediments exist in of deeper burial. The distribution, of these minerals overlaps each other along any geologic column varying in amount. These features of the distribution were interpreted as their genesis has been kinetically controlled. To estimate the reaction time which needs to begin to form zeolites and silica minerals, a kinetic model was introduced considering the effect of temperature. And it results that the reaction time to begin to form both clinoptilolite and cristobalite is about 5-20 m.y. at 30℃ and that for both analcime and quartz is about 50-200 m.y. at 30℃. Using the results, a simulation for the distribution of zeolites and silica minerals in a basin was made. It was suggested that the distribution of zeolites and silica minerals in Akita oil field has been governed by the thermalhistories, to which sediments have been subjected, and partly by chemical environments.
日本地質学会の論文
1978-11-30