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Osamu Takano

Osaka Prefecture University Japan

Osamu Takano, Ph.D. is a senior specialist of JAPEX, and a temporary research staff of JOGMEC and the Geological Survey of Japan. His expertise ranges from siliciclastic/carbonate sedimentology, basin analysis, tectonics and sedimentation to petroleum geology. In his works, he has plentiful experiences of sedimentological and sequence stratigraphic reservoir distribution analysis in both international and domestic hydrocarbon exploration/development projects. His special focus areas in his researches include forearc and backarc basins around Japan, where tectonics had much affected the basin-filling sedimentation styles. As the results of his researches, he has published more than sixty technical papers and given 120 presentations in both international and domestic academic meetings. As academic society jobs, he experienced an editorial board member of the journal of the Geological Society of Japan, a steering committee member of the Sedimentological Society of Japan, and an international panel member of the IODP science advisory structure.

5chapters authored

Chapters authored

Rock Magnetic Properties of Sedimentary Rocks in Central Hokkaido — Insights into Sedimentary and Tectonic Processes on an Active Margin

By Yasuto Itoh, Machiko Tamaki and Osamu Takano

Part of the book: Mechanism of Sedimentary Basin Formation

Numerical Modeling of Sedimentary Basin Formation at the Termination of Lateral Faults in a Tectonic Region where Fault Propagation has Occurred

By Shigekazu Kusumoto, Yasuto Itoh, Osamu Takano and Machiko Tamaki

Part of the book: Mechanism of Sedimentary Basin Formation

Variation in Forearc Basin Configuration and Basin-filling Depositional Systems as a Function of Trench Slope Break Development and Strike-Slip Movement: Examples from the Cenozoic Ishikari–Sanriku-Oki and Tokai-Oki–Kumano-Nada Forearc Basins, Japan

By Osamu Takano, Yasuto Itoh and Shigekazu Kusumoto

Part of the book: Mechanism of Sedimentary Basin Formation

Tectonic Synthesis: A Plate Reconstruction Model of the NW Pacific Region Since 100 Ma

By Yasuto Itoh, Osamu Takano and Reishi Takashima

Based on the results of interdisciplinary study from Chapters 1–4, a plate tectonic model of the northwestern Pacific region since 100 Ma is presented in this chapter. The evolution of the Pacific margin is viewed as a longstanding history of migration/amalgamation of allochthonous blocks onto the subduction zone. Such a process inevitably provoked diverse tectonic events, spatiotemporal positions of which have been discussed in this book. In order to reconcile paradoxical discrepancies in the docking process of arc fragments, the authors introduce a marginal sea plate with a spreading center that was alive in the Cretaceous. Oblique subduction of the ridge caused specific migratory igneous activity along the rim of the overriding plates, together with flips of shearing direction. Arc-trench systems on the eastern and western sides of the marginal sea plate developed following different timelines and were eventually mixed up during the plate’s closure that prompted formation of a coincident Oligocene clinounconformity widespread on the Eurasian margin. Since the demise of the hypothetical plate, the tectonic regime of the northwestern Pacific margin has been controlled by the growth, namely, the rotational history and modes of convergence of the Philippine Sea Plate.

Part of the book: Dynamics of Arc Migration and Amalgamation

Intermittent Formation, Sedimentation and Deformation History of Cenozoic Forearc Basins along the Northwestern Pacific Margins as an Indicator of Tectonic Scenarios

By Osamu Takano

This chapter examines the basin-filling stratigraphy and major unconformity events of the Cenozoic forearc basins in the NE Japan, SW Japan, Ryukyu and Izu-Bonin forearc territories along the northwestern Pacific margins to obtain information on the background tectonic scenarios along the plate subduction zones. The forearc basin type and tectonic history are characteristic for each forearc territory, reflecting the differences in plate tectonic processes. Several major unconformity events seem to be synchronous for a forearc territory or whole forearc territories around Japan, suggesting that these events originated from more or less wider scale plate tectonic events. In the NE Japan forearc territory, the Oligocene unconformity can be the largest events, which transformed the forearc basin styles from the trench slope break-uplifted, fluvial system-dominated type to the tensional, deeper marine sloped type. In the SW Japan and Ryukyu forearc territories, the latest Oligocene to Middle Miocene gap was the transformation phase from the Palaeogene Shimanto-type forearc and accretionary complex, to the Neogene compressive, sloped to ridged forearc basins, developments of which have been interrupted by several unconformity events possibly related to changes in plate tectonic condition. These transformations of the forearc basin styles may reflect the changes in plate tectonic conditions in the northwestern Pacific region.

Part of the book: Dynamics of Arc Migration and Amalgamation

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Related collaborators

Yasuto Itoh

Osaka Prefecture University

Atsushi Noda

National Institute of Advanced Industrial Science and Technology , Japan

Gentaro Kawakami

Hokkaido Research Organization , Japan

Keiji Takemura

Kyoto University , Japan

Machiko Tamaki

Osaka Prefecture University , Japan

Yasuto Itoh

Osaka Prefecture University , Japan

Keiji Takemura

Osaka Prefecture University , Japan

Shigekazu Kusumoto

Osaka Prefecture University , Japan

Tsuyoshi Haraguchi

Shigekazu Kusumoto