@article{oai:niigata-u.repo.nii.ac.jp:00003216, author = {Choi, Tad James and Kubota, Yoshihiro}, issue = {8}, journal = {地質学雑誌}, month = {Aug}, note = {This study clarified the stratigraphy of the Miocene series that occur in contact with pre-Neogene basement rocks in the Echigo-yuzawa region. Based on new lithologic assemblages, the Miocene stratigraphy and the tectonic process of the Echigo-Yuzawa Basin were reconstructed. The Miocene formations are distributed in the Shiozawa and Tsuchitaru areas in the Echigo-Yuzawa region. The Shiozawa area comprises the newly proposed Shiozawa Formation (Maiko Breccia Member, Yoshiyama Shale Member and Komatsuzawa Basalt Member) and the Tsuchitaru area comprises the redefined Matsukawa Formation (newly proposed Tsuchitaru Sandstone and Basalt Member, Nakazato Tuff Member and Kandatsu Shale Member). A new record of planktonic foraminifer indicative of Blow's N.9 (Blow, 1969) was discovered from the Kandatsu Shale Member. The tectonic development of the Miocene Echigo-Yuzawa Basin is as follows : [Stage I] Basin generation due to collapse, forming a lacustrine lake (18-17Ma). [Stage II] Subsidence accompanied with marine transgression and bimodal volcanism (17-15Ma). [Stage III] Continuous subsidence depositing mud (15Ma)., 本研究は新潟県越後湯沢堆積盆地縁辺部の中新統の層序を明らかにし,その発達過程を復元したものである.調査地域は塩沢地域と土樽地域に二分される.塩沢地域には,新称,塩沢層(舞子角礫部層,吉山頁岩部層,小松沢玄武岩部層)が分布する.土樽地域には松川層(新称,土樽砂岩,玄武岩部層,中里凝灰岩部層,神立頁岩部層)が分布する.神立頁岩部層からは今回新たに浮遊性有孔虫を確認し,Blow(1969)によるN.9に対比される.英知語湯沢堆積盆地の発達過程は,以下のステージにまとめられる.[I]陥没による盆地発生および湖沼性環境の形成(18-17Ma)[II]海進を伴う沈降とバイモーダル火山活動(17-15Ma)[III]引き続く沈降による厚い海成泥岩の堆積(15Ma)}, pages = {521--533}, title = {Miocene stratigraphy and tectonic process of the Echigo-Yuzawa Basin, Northern Fossa Magna region, central Japan}, volume = {106}, year = {2000} }