A joint research team of the National Institute of Advanced Industrial Science and Technology (hereinafter referred to as "AIST") and Nagoya University have completed a 5 / 1 geological map width "Itoigawa" that summarizes the results of geological surveys in the "Itoigawa" area of Niigata Prefecture. And published.
Since the geology of Japan differs greatly with the "Itoigawa-Shizuoka Tectonic Line" as the boundary, it is considered to be an important tectonic line when considering the formation of the Japanese archipelago.In addition, the northern Fossa Magna area on the eastern side of the northernmost part of the tectonic line is thought to be significantly uplifted, but when and how it was uplifted has not been clarified.Although the area has important geological significance, detailed geological surveys have not been conducted due to the extremely steep mountainous areas, and there has been no detailed geological map so far.
Therefore, from 2012 to 2014, the research team conducted a geological survey of the northernmost "Itoigawa" area for 115 days, clarified the type and distribution of the strata, and the details of the geological structure, and 5 minutes. 1 Geological map width "Itoigawa" is summarized.In addition, we carried out chemical analysis of rocks, analysis of volcanic ash, microfossil analysis, and fission track dating, organized the accurate division of each layer and the age of formation, and elucidated the geology of the Itoigawa area. ..In addition, there was a theory that the boundary between the Eurasian plate and the North American plate passes through the Itoigawa-Shizuoka Tectonic Line, but this time it became clear that the northernmost area including the "Itoigawa" area is not the plate boundary. rice field.
This figure width will start consignment sales from around September 9th from the consignment dealers affiliated with AIST.
