Magnesian andesites from Kibblewhite volcano in the Kermadec Arc, New Zealand

Yasuhiro Hirai; Yoshihiko Tamura; Tomoki Sato; Takashi Miyazaki; Qing Chang; Bogdan S Vaglarov; Jun-Ichi Kimura; Kaj Hoernle; Reinhard Werner; Folkmar Hauff; Christian Timm

Presentation information

[J] Poster

S (Solid Earth Sciences ) » S-CG Complex & General

[S-CG54] Volcanoes in the sea

Fri. May 31, 2024 5:15 PM - 6:45 PM Poster Hall (Exhibition Hall 6, Makuhari Messe)

convener:Yoshihiko Tamura(Research Institute for Marine Geodynamics, Japan Agency for Maine-Earth Science and Technology), Eisuke Fujita(National research Instituite for Earth science and Disaster Resilience, Volcanic research department), Fukashi Maeno(Earthquake Research Institute, University of Tokyo), Shigeaki Ono(Japan Agency for Marine-Earth Science and Technology)

5:15 PM - 6:45 PM

[SCG54-P12] Magnesian andesites from Kibblewhite volcano in the Kermadec Arc, New Zealand

Yasuhiro Hirai¹, *Yoshihiko Tamura¹, Tomoki Sato¹, Takashi Miyazaki¹, Qing Chang¹, Bogdan S Vaglarov¹, Jun-Ichi Kimura¹, Kaj Hoernle², Reinhard Werner², Folkmar Hauff², Christian Timm² (1.Research Institute for Marine Geodynamics, Japan Agency for Maine-Earth Science and Technology, 2.GEOMAR)

Keywords:Kermadec arc, magnesian andesite, continental crust, andesite

This study presents the petrology of volcanic rocks dredged from Kibblewhite volcano in the Kermadec arc during the RV SONNE SO-255 expedition in 2017. Magma types range from andesit to rhyolite and we focus on magnesian andesites from the northeastern flank of this volcano. We conclude that the magnesian andesites are produced by direct melting of the uppermost mantle of the Kermadec arc. The thin crustal thickness of the Kermadec ard should yield low pressure conditions in teh uppermost mantle, allowing the sub-arc mantle to generate primary andesitic melts.