Gravity and density variations of the tilted Tottabetsu plutonic complex, Hokkaido, northern Japan: implications for subsurface intrusive structure and pluton development

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  • Kamiyama Hiroyuki
    Institute of Seismology and Volcanology, Graduate School of Science, Hokkaido University
  • Yamamoto Akihiko
    Department of Earth Sciences, Faculty of Science, Ehime University
  • Hasegawa Takeshi
    Department of Earth and Planetary Sciences, Graduate School of Science, Hokkaido University
  • Kajiwara Takanori
    Institute of Seismology and Volcanology, Graduate School of Science, Hokkaido University
  • Mogi Toru
    Institute of Seismology and Volcanology, Graduate School of Science, Hokkaido University

書誌事項

公開日
2005
DOI
  • 10.1186/bf03351894
公開者
地球電磁気・地球惑星圏学会 、公益社団法人 日本地震学会、特定非営利活動法人 日本火山学会、日本測地学会、日本惑星科学会

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説明

An exposed cross section of the tilted Tottabetsu plutonic complex allows direct evaluation of its original 2-D cross-sectional shape and pretilting vertical density variations in both the pluton and the country rocks, which serves as a strong constraint in gravity modeling that complements information on the ‘missing’ pretilting horizontal dimension of this tilted pluton. The pluton is stratified with the uppermost thin granitic unit (-1-km thick) and the underlying thick gabbro-diorite units (-9-km thick) that preserve a stratigraphic record of numerous hotter replenishments in the form of alternation of originally horizontal mafic sheets and cumulate layers. Both the pluton and the country rocks show systematic density increase with pretilting crustal depth, but density contrast of the pluton with the country rocks varies between each unit. The 2-D cross-sectional shape and gravity analysis revealed that the pluton had a vertically-elongated shape with vertical side walls before tilting. The vertical side walls, together with the stack of the originally horizontal sheets and cumulate layers, suggests that the pluton grew only vertically by piston mechanism. The very thick, exposed cross section provides unequivocal evidence for development of such a pluton with this unusual shape and mass distribution, which has been inferred elsewhere only by some geophysical studies.

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