Rock and sediment dataset of petit-spots in the northwestern Pacific

Norikatsu Akizawa; Naoto Hirano; Shiki Machida; Akira Ishikawa; Yuka Niwa; Gen Shimoda; Kazutaka Yasukawa; Kenji M Matsuzaki; Chiori Tamura; Junji Kaneko

doi:10.1016/j.dib.2022.108764

Rock and sediment dataset of petit-spots in the northwestern Pacific

Data Brief. 2022 Nov 21:45:108764. doi: 10.1016/j.dib.2022.108764. eCollection 2022 Dec.

Authors

Norikatsu Akizawa^{1

2}, Naoto Hirano³, Shiki Machida⁴, Akira Ishikawa⁵, Yuka Niwa⁵, Gen Shimoda⁶, Kazutaka Yasukawa⁷, Kenji M Matsuzaki¹, Chiori Tamura¹, Junji Kaneko⁸

Affiliations

¹ Atmosphere and Ocean Research Institute, The University of Tokyo, 5-1-5, Kashiwanoha, Kashiwa, Chiba 277-8564, Japan.
² School of Natural Sciences, Macquarie University, Sydney, New South Wales 2109, Australia.
³ Center for NE-Asian Studies, Tohoku University, 41, Kawauchi, Aobaku, Sendai, Miyagi 980-8576, Japan.
⁴ Ocean Resources Research Center for Next Generation, Chiba Institute of Technology, 2-17-1, Tsudanuma, Narashino, Chiba 275-0016, Japan.
⁵ Department of Earth and Planetary Sciences, Tokyo Institute of Technology, 2-12-1, Ookayama, Meguro, Tokyo 152-8550, Japan.
⁶ Geological Survey of Japan, National Institute of Advanced Industrial Science and Technology, Tsukuba 305-8567, Japan.
⁷ Frontier Research Center for Energy and Resources, School of Engineering, The University of Tokyo, 7-3-1, Hongo, Bunkyo, Tokyo 113-8656, Japan.
⁸ Submarine Resources Research Center, Japan Agency for Marine-Earth Science and Technology, 2-15, Natsushima, Yokosuka, Kanagawa 237-0061, Japan.

Abstract

Rock and sediment samples were collected from petit-spots in the northwestern Pacific. The sampling was conducted using deep-submergence vehicle (DSV) Shinkai 6500 and its mother ship, research vessel (RV) Yokosuka during YK20-14S and YK21-07S cruises. The collected rock samples are basalt and peperite. Some of the basalts include small mantle xenoliths (∼3 cm in diameter). The dataset of rock and sediment samples from the petit-spots located on >130 Ma northwestern Pacific plate are presented herein. The peperites are a reaction product between petit-spot magma and wet sediment, and the mantle xenoliths are fragmented mantle materials transported by the petit-spot magmas. Therefore, the petit-spot samples are of significant importance to elucidate modification process of the surface condition by petit-spot magma and to characterize the deep lithospheric mantle. The dataset presented herein provides in a sense a unique insight into the whole Pacific plate just before its subduction beneath the Japan arc.

Keywords: Basalt; Magma–wet sediment interaction; Mantle xenolith; Outer rise; Peperite; Shinkai 6500; Yokosuka.