R7: Petrology, Mineralogy and Economic geology (Joint session with SRG)

[R7P-10] Glauconite from the Upper Cretaceous Upper Yezo Group in Haboro area, Hokkaido, northern Japan

*Montani Akihiro¹ (1. Ehime Univ.)

Keywords:Glauconite, Upper Cretaceous, Upper Yezo Group, Haboro area

Glauconite is thought to be a stratigraphically important mineral. Although "glauconite"-bearing beds have been reported from various areas/horizons in the Upper Cretaceous Upper Yezo Group, few of these "glauconite" were mineralogically identified as true glauconite. We mineralogically examined green grains within "glauconite-bearing sandstone beds" at several horizons in the Upper Yezo Group in the Haboro area, northern Hokkaido, and found that all samples contained true glauconite.