Fig. 1
From: K-feldspar enrichment in the Pacific pelagic sediments before Miocene
a 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 hiatus