Fig. 1From: K-feldspar enrichment in the Pacific pelagic sediments before Miocenea Map showing the positions and backtracks of the study site (Minamitorishima) and the sites mentioned in the text. Dots represent paleopositions for every 5 Myr back to 70 Ma. Plate motion was calculated using GPlates version 2.3 (https://www.gplates.org) with the rotation model of (Müller et al. 2019). Correlation between b KR13-02 PC05 and c MR14-E02 PC11 by magnetic susceptibility (MS) and chemostratigraphy (Tanaka et al. 2020a). Magnetic susceptibility was measured with 7 cc cube specimens using Kappabridge (AGICO, KLY-4). Arrows indicate age constraints obtained by ichthyolith stratigraphy (Ohta et al. 2020), Osmium isotopes stratigraphy (Nozaki et al. 2019; Ohta et al. 2020), and magnetostratigraphy (Usui and Yamazaki 2021). lE stands for late Eocene, and eO for early Oligocene. Orange horizontal line in c indicates a hiatusBack to article page