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Uplift of the Hidaka Collisional Orogen, Hokkaido, Japan Inferred from Stratigraphy and Thermochronology

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Title: Uplift of the Hidaka Collisional Orogen, Hokkaido, Japan Inferred from Stratigraphy and Thermochronology
Authors: Kawakami, Gentaro Browse this author
Ono, Masako Browse this author
Ohira, Hiroto Browse this author
Arita, Kazunori Browse this author
Itaya, Tetsumaru Browse this author
Kawamura, Makoto Browse this author
Keywords: Stratigraphy
Thermochronology
Uplift
Hidaka collisional orogen
Hokkaido
Issue Date: 2004
Publisher: Graduate School of Science, Hokkaido University
Citation: Edited by Shunsuke F. Mawatari, Hisatake Okada.
Journal Title: Neo-Science of Natural History: Integration of Geoscience and Biodiversity Studies : Proceedings of International Symposium on "Dawn of a New Natural History - Integration of Geoscience and Biodiversity Studies" March 5-6, 2004, Sapporo
Start Page: 121
End Page: 125
Abstract: This paper reviews the stratigraphic and thermochronologic data concerning the exhumation history of the Hidaka collisional orogen, Hokkaido, Japan. The Neogene sedimentary record of foreland basin suggests that the topographic uplift of the orogen occurred in the Middle Miocene. The first occurrence of large amount of orogen-sourced granite clasts has been found in the Middle Miocene turbidites around 15 Ma. These granite clasts are S-type monzogranite-granodiorite, and show the Paleogene biotite K-Ar ages of 29-46 Ma. These data suggest that they are originated from Paleogene granitic plutons emplaced in the shallow part of the Hidaka crust. On the other hand, the overlying Late Miocene deposits contain clasts of metamorphic rocks and tonalite which are characterized by Miocene biotite K-Ar ages of 16-19 Ma. These clasts of syn-uplift reset ages represent exhumation of the middle part of the crust. The present-day outcrops of the crystalline core zone of the Hidaka orogen show that the upper and middle crustal rocks have Paleogene and Miocene biotite K-Ar ages, respectively. Thus, the diachronic change of detrital materials in the foreland basin together with the above-mentioned thermochronologic contrast simply responds to a normal exhumation of the orogen. To explain the change of detrital assemblages, it was suggested that the different areas of the Hidaka orogen have undergone a significant denudation through two uplift events at Middle and Late Miocene. Our data, however, show a successive exhumation occurred in the southern Hidaka orogen where deepseated crustal rocks now crop out.
Description: International Symposium on "Dawn of a New Natural History - Integration of Geoscience and Biodiversity Studies". 5-6 March 2004. Sapporo, Japan.
Conference Name: International Symposium on "Dawn of a New Natural History : Integration of Geoscience and Biodiversity Studies"
Conference Place: Sapporo
Type: proceedings
URI: http://hdl.handle.net/2115/38516
Appears in Collections:Neo-Science of Natural History : Integration of Geoscience and Biodiversity Studies > Proceedings

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