2024-03-29T02:38:43Z
https://niigata-u.repo.nii.ac.jp/oai
oai:niigata-u.repo.nii.ac.jp:00006803
2022-12-15T03:40:05Z
176:177:178:185
453:456
Middle Jurassic radiolarians from a siliceous mudstone clast within conglomerate of the Tetori Group in the Itoigawa area, Niigata Prefecture, central Japan
Middle Jurassic radiolarians from a siliceous mudstone clast within conglomerate of the Tetori Group in the Itoigawa area, Niigata Prefecture, central Japan
Ito, Tsuyoshi
54317
Sakai, Yusuke
54318
Ibaraki, Yousuke
54319
Matsuoka, Atsushi
54320
conglomerate
etched surface
Jurassic radiolaria
Mizukamidani Formation
Tetori Group
accretionary complexes
Well-preserved radiolarians were extracted from a siliceous mudstone pebble within conglomerate of the Mizukamidani Formation of the Tetori Group in the Itoigawa area, Niigata Prefecture, central Japan. These radiolarians correspond to the assemblage of the Middle Jurassic (Striatojaponocapsa plicarum Zone (JR4): Bajocian to early Bathonian). Based on general features of an accretionary complex and previous knowledge of the surrounding geological units in East Asia, the Middle Jurassic (JR4) siliceous mudstone was derived from the latest Middle or Late Jurassic accretionary complexes. This result indicates that the latest Middle or Late Jurassic accretionary complexes had been exposed and denudated in the depositional time of the Mizukamidani Formation.
departmental bulletin paper
新潟大学理学部
2014-03
application/pdf
Science reports of Niigata University. (Geology)
29
1
11
Science reports of Niigata University. (Geology)
AA11436808
13491237
https://niigata-u.repo.nii.ac.jp/record/6803/files/29_1-11.pdf
eng