HUSCAP logo Hokkaido Univ. logo

Hokkaido University Collection of Scholarly and Academic Papers >
Graduate School of Science / Faculty of Science >
Peer-reviewed Journal Articles, etc >


Files in This Item:
演習林108.pdf92.33 MBPDFView/Open
Please use this identifier to cite or link to this item:

Title: 東京大学北海道演習林地域に分布する中生界空知層群および蝦夷層群の層序と地質
Other Titles: Geology and stratigraphy of the Sorachi and Yezo Groups in the Tokyo University Forests in Hokkaido, Japan
Authors: 高嶋, 礼詩1 Browse this author
宮本, 義憲2 Browse this author
西, 弘嗣3 Browse this author
吉田, 武義4 Browse this author
Authors(alt): Takashima, Reishi1
Miyamoto, Yoshinori2
Nishi, Hiroshi3
Yoshida, Takeyoshi4
Keywords: ジュラ紀
Sorachi Group
oolite lime stone
Issue Date: Dec-2002
Publisher: 東京大学大学院農学生命科学研究科附属演習林
Journal Title: 東京大学農学部演習林報告
Volume: 108
Start Page: 57
End Page: 76
Abstract: 要旨: 東京大学北海道演習林地域には上部ジュラ-白亜系空知層群および蝦夷層群が分布する。本地域の空知層群は、下位より玄武岩主体の極楽平層、筑紫岳マイクロモンゾナイト、礫岩、砂岩、泥岩からなる布部層、玄武岩主体で珪質泥岩を伴う小黒瀬層、泥岩と珪長質凝灰岩からなる麓郷層に区分される。このうち、筑紫岳マイクロモンゾナイトと布部層は不整合関係にあり、不整合直上の基底礫岩からはウーライト石灰岩のブロックが含まれることが明らかとなった。従来、空知層群は深海底の堆積物と考えていたが、不整合とウーライト石灰岩の存在は、体積盆の一部が浅海、陸化していたことを示唆する。
Abstract: The upper Jurassic to lower Cretaceous Sorachi Group is Distributed along the western part of the Tokyo University Forests in Hokkaido, Japan. The Sorachi Group in this area consists mainly of mafic and intermediate igneous rocks, with subordinate volcanogenic sedimentary rocks. The group is divided into the Gokurakudaira Formation, Chikushidake Micromonzonite, Nunobe Formation, Ogurose Formation, and Rokugo Formation, in ascending order. An unconformity is found between the Chikushidake Micromonzonite and the Nunobe Formation, and the basal conglomerate on the unconformity contains oolite limestone blocks. These facts suggest that the Sorachi basin rose above the sea level, and ooids were formed around the shallow coast of an emerged basin.
Type: article (author version)
Appears in Collections:理学院・理学研究院 (Graduate School of Science / Faculty of Science) > 雑誌発表論文等 (Peer-reviewed Journal Articles, etc)

Submitter: 高嶋 礼詩

Export metadata:

OAI-PMH ( junii2 , jpcoar_1.0 )

MathJax is now OFF:


 - Hokkaido University