Tectonophysics2022，Vol.82817.DOI:10.1016/j.tecto.2022.229231

Low-temperature thermochronology of active arc-arc collision zone, South Fossa Magna region, central Japan

Sueoka, Shigeru Kobayashi, Yumi Fukuda, Shoma Kohn, Barry P. Yokoyama, Tatsunori Sano, Naomi Hasebe, Noriko Tamura, Akihiro Morishita, Tomoaki Tagami, Takahiro
Tectonophysics2022，Vol.82817.DOI:10.1016/j.tecto.2022.229231
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  • NSTL
  • Elsevier

Low-temperature thermochronology of active arc-arc collision zone, South Fossa Magna region, central Japan

Sueoka, Shigeru 1Kobayashi, Yumi 2Fukuda, Shoma 1Kohn, Barry P. 3Yokoyama, Tatsunori 1Sano, Naomi 1Hasebe, Noriko 4Tamura, Akihiro 4Morishita, Tomoaki 4Tagami, Takahiro2
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作者信息

  • 1. Japan Atom Energy Agcy
  • 2. Kyoto Univ
  • 3. Univ Melbourne
  • 4. Kanazawa Univ
  • 折叠

Abstract

The South Fossa Magna region, central Japan, has been an active collision zone between the Honshu Arc and the Izu-Bonin Arc since the middle Miocene and provides an excellent setting for reconstructing the earliest stages of continent formation. Multi-system geo-thermochronometry was applied to different domains of the South Fossa Magna region, together with some previously published data, to reveal mountain formation processes, i.e., vertical crustal movements. Nine granitic samples yielded zircon U-Pb ages of 10.2-5.8 Ma (n = 2), apatite (U-Th)/He (AHe) ages of 42.8-2.6 Ma (n = 7), and apatite fission-track (AFT) ages of 44.1-3.0 Ma (n = 9). Thermal history inversion modeling based on the AHe and AFT data suggests rapid cooling events confined within the study region at similar to 6-2 Ma. The Kanto Mountains may have undergone a domal uplift in association with their collision with the Tanzawa Block at similar to 5 Ma. However, this uplift may have slowed down following the southward migration of the plate boundary and late Pliocene termination of the Tanzawa collision against Honshu Island. The Minobu Mountains and adjacent mountains may have been uplifted when motion of the Philippine Sea plate changed from northward to northwestward at similar to 3 Ma. Therefore, mountain formation in the South Fossa Magna region was mainly controlled by collisions of the Tanzawa and Izu Blocks and motional change of the Philippine Sea plate. Earlier collisions of the Kushigatayama Block at similar to 13 Ma and Misaka Block at similar to 10 Ma appear to have had little effect on mountain formation. Together with a clockwise rotation of the Kanto Mountains at 12-6 Ma, these observations suggest that horizontal deformation predominated during the earlier stage of arc-arc collision, and vertical movements due to buoyancy of the accreted crust resulting from crustal shortening and thickening developed at a later stage.

Key words

Low-temperature thermochronology/Exhumation/Arc-arc collision/South Fossa Magna region/Mountain formation/TANZAWA PLUTONIC COMPLEX/TRACK ANNEALING KINETICS/APATITE (U-TH)/HE/CRUSTAL DEFORMATION/DENUDATION HISTORY/CONTINENTAL-CRUST/RADIATION-DAMAGE/HELIUM DIFFUSION/NORTHEAST JAPAN/FISSION TRACKS

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出版年

2022
Tectonophysics

Tectonophysics

EISCI
ISSN：0040-1951
参考文献量103
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