Paleoclimatic and paleoceanographic records through Marine Isotope Stage 19 at the Chiba composite section, central Japan: A key reference for the Early–Middle Pleistocene Subseries boundary
Year: 2018
Type: article
Abstract: Marine Isotope Stage (MIS) 19 is an important analogue for the present interglacial because of its similar orbital configuration, especially the phasing of the obliquity maximum to precession minimum. However, sedimentary records suitable for capturing both terrestrial and marine environmental changes are limited, and thus the climatic forcing mechanisms for MIS 19 are still largely unknown. The Chiba composite section, east-central Japanese archipelago, is a continuous and expanded marine sedimentary succession well suited to capture terrestrial and marine environmental changes through MIS 19. In this study, a detailed oxygen isotope chronology is established from late MIS 20 to early MIS 18, supported by a U-Pb zircon age and the presence of the Matuyama–Brunhes boundary. New pollen, marine microfossil, and planktonic foraminiferal δ18O and Mg/Ca paleotemperature records reveal the complex interplay of climatic influences. Our pollen data suggest that the duration of full interglacial conditions during MIS 19 extends from 785.0 to 775.1 ka (9.9 kyr), which offers an important natural baseline in predicting the duration of the present interglacial. A Younger Dryas-type cooling event is present during Termination IX, suggesting that such events are linked to this orbital configuration. Millennial- to multi-millennial-scale variations in our δ18O and Mg/Ca records imply that the Subarctic Front fluctuated in the northwestern Pacific Ocean during late MIS 19, probably in response to East Asian winter monsoon variability. The climatic setting at this time appears to be related to less severe summer insolation minima at 65˚N and/or high winter insolation at 50˚N. Our records do not support a recently hypothesized direct coupling between variations in the geomagnetic field intensity and global/regional climate change. Our highly resolved paleoclimatic and paleoceanographic records, coupled with a well-defined Matuyama–Brunhes boundary (772.9 ka; duration 1.9 kyr), establish the Chiba composite section as an exceptional climatic and chronological reference section for the Early–Middle Pleistocene boundary.
Source: Quaternary Science Reviews
Authors: Yusuke Suganuma, Yuki Haneda, Koji Kameo, Yoshimi Kubota, Hiroki Hayashi, Takuya Itaki, Masaaki Okuda, Martin, J. Head, Manami Sugaya, Hiroomi Nakazato, Atsuo Igarashi, Kizuku Shikoku, Misao Hongo, Masami Watanabe, Yasufumi Satoguchi, Yoshihiro Takeshita, Naohisa Nishida, Kentaro Izumi, Kenji Kawamura, Moto Kawamata, Jun’ichi Okuno, Takeshi Yoshida, Itaru Ogitsu, Hisashi Yabusaki, Makoto Okada
Institutions: The Graduate University for Advanced Studies, SOKENDAI, National Institute of Polar Research, Ibaraki University, Chiba University, National Museum of Nature and Science, Shimane University, Geological Survey of Japan, Natural History Museum and Institute, Brock University, Institute for Rural Engineering, Lake Biwa Museum, Shinshu University, Tokyo Gakugei University
Language: English
Subfield: Atmospheric Science
Field: Earth and Planetary Sciences
Domain: Physical Sciences
Open Access status: hybrid
Estimated APC paid: $3,920
Awards: G1037939010, G1491134134, G1875987115, Verification of the "Yayoi regression" by numerical modeling of isostasy, High-resolution reconstruction of the paleoenvironmental changes recorded in the Kokumoto Formation, Kazusa Group, based on multiproxy analysis, Age determination for the Matuyama-Brunhes geomagnetic reversal boundary and comprehensive calibration of geologic ages, Search for evidence of supernova events based on cosmogenic nuclides analysis of the marine sediment, G5219668243, A Development of Teaching Material for Earth Science Education using the Digital Geological Map of Nagano Prefecture, Variations of climate, ocean and ice sheet over deglaciations from high resolution gas analyses of Antarctic ice cores(Fostering Joint International Research)
OpenAlex ID: W2806482989