Structural Movements and Coalification of the Amakusa Coal
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概要
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In this paper the relationship between the structural movement and the coalification in the Amakusa coal field, Kumamoto Prefecture, is discussd. The six movements of different type, which happened in the different ages, are discriminated from the geological investigation. The first one was subsiding movement of the the basement, by which the sediments of the Tertiary were accumulated. During and afetr the deposition of the Tertiary the coal altered diagenetically.<BR>The second movement caused the igneous activity, and a lot of igneous rocks such as tholeiitic basalt, hornblende-quartz andesits, etc. came out, of which the andesite intruded into the coal seams of the northern part, resulted in the products of natural cokes or "Kawarake".<BR>Prior to this thermal alteration, the coal might be in bituminous-rank. The third movement was the folding, through which "the Ittyoda Synclinal Structure was formed." Because this movement was more intense in the central and southern parts of the field, the coalification in these parts was higher than that in the northern part.<BR>According to the following fourth fold move-ment, which was stronger in the northern part just contrary to the former case, the coalification-grade became reverse that is known at present. It is noted here that in this movement coal balls of "Kawarake and Kiratan" and Schungit were formed, both of them are presumed to be formed only under strong compressive force.<BR>Up to this movement the main coalification of the Amakusa coal might have been completed, resulting in that no more serious alteration of coal occured, although the fifth and sixth movemenets were in turn taken place.
- 一般社団法人 日本エネルギー学会の論文
一般社団法人 日本エネルギー学会 | 論文
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