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Aktionsforschung als Methode für die kontinuierliche Verbesserung der Fremdsprachenlehre
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To What Degree Did the Three-dimensional Trademark Registration of Cialis® Tablets Affect Its Generic Medicines’ Appearances?
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Serum Free Fatty Acid Changes Caused by High Expression of Stearoyl-CoA Desaturase 1in Tumor Tissues Are Early Diagnostic Markers for Ovarian Cancer
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On the Distribution of Infinitival Complements of CAUSE in the English Bibles
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The 2024 European Parliament Election and Right-Wing Parties: Factors Impeding the Formation of a Unified Parliamentary Group
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Lionel Robbins on International Economic Order : From A “Classical Liberalism” Perspective
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Television Dramas as a “Device” for Reliving War: Focusing on Text Analysis of Three Works by NHK and Commercial Broadcasters
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Geochronology of the Oamamiyama Group in Gifu Prefecture
Get PDFLate Cretaceous–Paleogene volcanic rocks (e.g., Nohi Rhyolite) are one of the main components of central Japan on
the northwest of the Median Tectonic Line. The Oamamiyama Group is one of them and consists mainly of andesitic to
rhyolitic lavas and pyroclastic rocks with some epiclastic rock layers in the lower part. The Oamamiyama Group consists
of the Miyadanigawa, Akegadani, and Kijiya formations, in ascending order, and the Miyadanigawa Formation is divided
into the Wada Breccia, Miyaji Conglomerate, Kashihara Tuff, and Sanyasuminotaki Rhyolite members, also in ascending
order. Late Cretaceous pollen fossils from the Miyadanigawa Formation offer critical insights into the Late Cretaceous
flora of central Japan. The Gomihara Granophyre of 58.8 ± 1.5 Ma (K–Ar Alkali-feldspar date) intrudes the Oamamiyama
Group. We performed U–Pb dating of zircon on (1) pebbly reddish sandstone from the Miyaji Conglomerate Member in
the lower part of the Miyadanigawa Formation and on (2) lapilli tuff from the Kashihara Tuff Member in the main part of
the formation. The weighted mean U–Pb zircon dates (YC2σ) were 71.35 ± 0.54 Ma and 71.47 ± 0.63 Ma, respectively,
providing constraints on the maximum depositional ages of these members. Based on our new zircon data and the pres
ence of Late Cretaceous pollen fossils, we interpret the Miyadanigawa Formation to have been deposited during the
Maastrichtian stage of the Late Cretaceous. Furthermore, incorporating the K–Ar date of the Gomihara Granophyre, we
suggest that the Oamamiyama Group was formed during the Late Cretaceous Maastrichtian–Paleocene Thanetian (ca.
72–57 Ma).departmental bulletin pape