盛岡北部の渋民溶結凝灰岩層（アク石）の14C年代と地球磁場の逆転について

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  • 14C Ages and Geomagnetic Reversals of the Shibutami Welded Tuff Bed in the Northern Part of Morioka
  • モリオカ ホクブ ノ シブタミ ヨウケツ ギョウカイガンソウ アクセキ ノ 1

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The Shibutami welded tuff bed characterized by the geomagnetic reversals is distributed along the Kitakami river between Numakunai (141°15'E , 40°N) and Morioka ( 141° 10'E, 39°40'N), and it is estimated to have been erupted as the nuee ardente from Hachimantai volcano which is located at the western side of this area. The 14C ages were measured on the two samples obtained from the Shitozawa sand and gravel ted intercalated with the welded tuff bed at Shimoda (Shibutami) in the northern part of Morioka. The 14C ages are shown as follows. Sample no. 1 30,780 ± 2170 yr BP (Gak-6356) Sample no. 2 29,630 + 2130 yr BP (Gak-6794) Accordingly the geomagnetic reversals of the Shibutami welded tuff bed (about 30,000 ± yr BP) may be related to the Laschamp event (20,000-30,000 yr BP) in the Brunhes Normal Epoch (Bonhommet, N. and Zahringer, J., 1969 and Cox, A., 1969) and to the geomagnetic excursion 30,000 yr BP (Barbetti, M. and McElhinny, M., 1972).

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