Yusuke Shimura
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View article: Conglomerates in the Shimanto Accretionary Complex, SW Japan: Origin, Deposition, and the Influence of Subduction of the Izanagi–Pacific Spreading‐Ridge
Conglomerates in the Shimanto Accretionary Complex, SW Japan: Origin, Deposition, and the Influence of Subduction of the Izanagi–Pacific Spreading‐Ridge Open
The Shimanto Accretionary Complex in SW Japan consists mainly of alternating sandstone‐ and mudstone‐dominated sequences with a trench‐fill turbiditic origin. However, depositional histories of the coarse‐grained Ohyamamisaki (Shikoku) and…
View article: An automatic peak deconvolution code for Raman spectra of carbonaceous material and a revised geothermometer for intermediate- to moderately high-grade metamorphism
An automatic peak deconvolution code for Raman spectra of carbonaceous material and a revised geothermometer for intermediate- to moderately high-grade metamorphism Open
Carbonaceous material (CM) undergoes progressive changes that reflect its thermal history. These changes are in general irreversible and provide valuable information for understanding diagenetic and metamorphic processes of crustal rocks. …
View article: Tectonic division of the Southwestern terrane at the western Sør Rondane Mountains, Dronning Maud Land, East Antarctica, from a viewpoint of zircon U-Pb ages
Tectonic division of the Southwestern terrane at the western Sør Rondane Mountains, Dronning Maud Land, East Antarctica, from a viewpoint of zircon U-Pb ages Open
The Sør Rondane Mountains (SRM) in East Antarctica, lie within the late Neoproterozoic–early Paleozoic collision zone between East and West Gondwana. Many studies have been carried out in the eastern SRM, whereas fundamental questions on t…
View article: Data for: Structural analyses and peak-temperature estimations for the Sanbagawa Metamorphic and Shimanto Accretionary complexes on the central Kii Peninsula, SW Japan: Implications for the tectonic development of Cretaceous subduction complexes
Data for: Structural analyses and peak-temperature estimations for the Sanbagawa Metamorphic and Shimanto Accretionary complexes on the central Kii Peninsula, SW Japan: Implications for the tectonic development of Cretaceous subduction complexes Open
This is the original data for “Structural analyses and peak-temperature estimations for the Sanbagawa Metamorphic and Shimanto Accretionary complexes on the central Kii Peninsula, SW Japan: Implications for the tectonic development of Cret…
View article: Zircon U–Pb ages on plutonic rocks in the eastern area of 1:200,000 quadrangle, Toyama, central Japan
Zircon U–Pb ages on plutonic rocks in the eastern area of 1:200,000 quadrangle, Toyama, central Japan Open
20万分の1地質図幅「富山」の改訂に伴い,範囲内に分布する先古第三紀の深成岩類のジルコン238U–206Pb年代を測定し,飛驒帯における火成活動史を考察した.
View article: The latest Early Cretaceous detrital zircons from clastic rocks in the Koshibu-gawa area of the central Akaishi Mountains
The latest Early Cretaceous detrital zircons from clastic rocks in the Koshibu-gawa area of the central Akaishi Mountains Open
We conducted U-Pb dating of detrital zircons from three clastic rock samples, which have been classified into the Chichibu Belt in the Koshibu-gawa area, central Akaishi Mountains. U-Pb ages of the samples fall into two main age groups at …
View article: Geological traverse across the Shimanto and Sanbagawa belts on the central Kii Peninsula, SW Japan
Geological traverse across the Shimanto and Sanbagawa belts on the central Kii Peninsula, SW Japan Open
沈み込み帯における,浅部での付加体形成から深部での高圧型変成岩類の形成・上昇といった一連の付加-上昇テクトニクスを解明する上で,同時期に形成された付加体と高圧型変成岩類を対象とし,両地質体の地質構造の関係を明らかにすることは重要である.近年,砕屑性ジルコンU-Pb年代測定により,三波川帯に属する高圧型変成岩類の主に砂質片岩から白亜紀の砕屑性ジルコンが見出され,主な原岩である陸源砕屑岩の堆積年代が四万十帯の白亜紀付加体の堆積年代と一致することが明らかになった.すなわち,西南日…
View article: Detrital zircon U-Pb ages of the Cretaceous Unokawa Complex in the Shimanto Belt on the central Kii Peninsula, SW Japan
Detrital zircon U-Pb ages of the Cretaceous Unokawa Complex in the Shimanto Belt on the central Kii Peninsula, SW Japan Open
The depositional age sequence of Cretaceous accretionary complexes in the Kouyasan Belt of the Shimanto Belt (central Kii Peninsula, SW Japan) is poorly constrained owing to a lack of age data for the Unokawa Complex in this belt. We condu…
View article: Original Data for “Relationship between deformation and temperature in a subduction zone: examples from accretionary and high-P/T metamorphic complexes on the central Kii Peninsula, SW Japan”
Original Data for “Relationship between deformation and temperature in a subduction zone: examples from accretionary and high-P/T metamorphic complexes on the central Kii Peninsula, SW Japan” Open
This is the original data for “Relationship between deformation and temperature in a subduction zone: examples from accretionary and high-P/T metamorphic complexes on the central Kii Peninsula, SW Japan”, including five Excel datasheet fil…
View article: Detrital zircon U-Pb ages of the accretionary complex in the Chichibu Belt in the central part of the Akaishi Mountains, central Japan
Detrital zircon U-Pb ages of the accretionary complex in the Chichibu Belt in the central part of the Akaishi Mountains, central Japan Open
U-Pb dating of detrital zircons was undertaken for three sandstone samples of the accretionary complex in the Chichibu Belt, central Akaishi Mountains, central Japan. The youngest single-grain ages are 170.1±2.3 Ma (1σ), 158.2±1.5 Ma, and …
View article: Geological structure and detrital zircon U-Pb age around the boundary between the Jurassic Chichibu and Cretaceous Shimanto accretionary complexes in the central Kii Peninsula, SW Japan
Geological structure and detrital zircon U-Pb age around the boundary between the Jurassic Chichibu and Cretaceous Shimanto accretionary complexes in the central Kii Peninsula, SW Japan Open
本研究は,紀伊半島中央部に分布する秩父-四万十付加体境界周辺において,詳細な野外調査を行った.本地域では,秩父付加体の山葵谷コンプレックスと四万十付加体の麦谷コンプレックスが,西北西-東南東走向で南に低角で傾斜した大峯-大台スラストで接している.また,大峯-大台スラストを介して構造的上位に分布する秩父付加体の山葵谷コンプレックスにおいて,砂岩のジルコンU-Pb年代測定を行い,最も若いジルコン粒子および最も若いクラスター年代として,約168~152Maの年代が得られた.四万十…
View article: Detrital zircon U-Pb ages of the Cretaceous Akaishi Group in the Shimanto Belt, Akaishi Mountains
Detrital zircon U-Pb ages of the Cretaceous Akaishi Group in the Shimanto Belt, Akaishi Mountains Open
We conducted U-Pb dating of detrital zircons from three sandstones of the central section of the Akaishi Group, which is part of the Shimanto Belt in the Akaishi Mountains. The youngest single-grain ages are 113.6±2.3 Ma (1σ), 114.1±1.6 Ma…
View article: Geology and detrital zircon U-Pb age of the Cretaceous Mugitani Formation in the Shimanto Belt, central Kii Peninsula, Southwest Japan
Geology and detrital zircon U-Pb age of the Cretaceous Mugitani Formation in the Shimanto Belt, central Kii Peninsula, Southwest Japan Open
紀伊半島中央部に分布する四万十帯白亜系の構造的最上位の地層である麦谷層について,岩相分布,地質構造,および砕屑性ジルコンU-Pb年代を明らかにした.本地域の麦谷層は,構造的上位から下位へ,泥岩,破断した砂岩泥岩互層,および混在岩を主とする伊豆尾ユニットと,泥岩を主とする狭戸ユニットに区分され,層理面は概ね西北西-東南東走向で,北に中角で傾斜する.麦谷層の3試料から得られた砕屑性ジルコンU-Pb年代によると,最も若いジルコン粒子年代もしくは最も若いクラスター年代は100~11…
View article: Effectiveness for Determination of Depositional Age by Detrital Zircon U–Pb Age in the Cretaceous Shimanto Accretionary Complex of Japan
Effectiveness for Determination of Depositional Age by Detrital Zircon U–Pb Age in the Cretaceous Shimanto Accretionary Complex of Japan Open
Detrital zircon U–Pb ages indicate the crystallization age. Therefore, it is necessary to evaluate the effectiveness of determining the age of deposition using zircon age data. We carried out U–Pb dating of detrital zircons from sandstone …
View article: U-Pb ages of detrital zircon from the tuffaceous sandstone of the Shimanto Belt in the Kii Peninsula
U-Pb ages of detrital zircon from the tuffaceous sandstone of the Shimanto Belt in the Kii Peninsula Open
本研究では,紀伊半島に分布する四万十帯白亜系丹生ノ川層,古第三系音無川層群,および双方の境界断層にレンズ状に分布する白亜系竜神層を対象として,凝灰質砂岩に含まれるジルコンのU-Pb年代測定を行い,得られた年代データについてガウス分布で近似することによりクラスター解析を行った.その結果,丹生ノ川層は63.0±1.8Ma(2σ),竜神層は55.8±2.5Ma(2σ),音無川層群は50.8±1.0Ma(2σ)の堆積年代を示した.今回の結果は,構造的上位から下位に向かって堆積年代が…