Indian Monsoonal Variations During the Past 80 Kyr Recorded in NGHP‐02 Hole 19B, Western Bay of Bengal: Implications From Chemical and Mineral Properties

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  • Yuki Ota
    Atmosphere and Ocean Research Institute The University of Tokyo Kashiwa Japan
  • Hodaka Kawahata
    Atmosphere and Ocean Research Institute The University of Tokyo Kashiwa Japan
  • Junichiro Kuroda
    Atmosphere and Ocean Research Institute The University of Tokyo Kashiwa Japan
  • Asuka Yamaguchi
    Atmosphere and Ocean Research Institute The University of Tokyo Kashiwa Japan
  • Atsushi Suzuki
    Geological Survey of Japan National Institute of Advanced Industrial Science and Technology (AIST) Tsukuba Japan
  • Daisuke Araoka
    Geological Survey of Japan National Institute of Advanced Industrial Science and Technology (AIST) Tsukuba Japan
  • Ayako Abe‐Ouchi
    Atmosphere and Ocean Research Institute The University of Tokyo Kashiwa Japan
  • Yasuhiro Yamada
    NGHP‐02 scientist team, Japan Agency for Marine‐Earth Science Technology Yokosuka Japan
  • Akira Ijiri
    NGHP‐02 scientist team, Japan Agency for Marine‐Earth Science Technology Yokosuka Japan
  • Toshiya Kanamatsu
    NGHP‐02 scientist team, Japan Agency for Marine‐Earth Science Technology Yokosuka Japan
  • Masataka Kinoshita
    NGHP‐02 scientist team, Japan Agency for Marine‐Earth Science Technology Yokosuka Japan
  • Kyaw Thu Moe
    NGHP‐02 scientist team, Japan Agency for Marine‐Earth Science Technology Yokosuka Japan
  • Weiren Lin
    NGHP‐02 scientist team, Japan Agency for Marine‐Earth Science Technology Yokosuka Japan
  • Saneatsu Saito
    NGHP‐02 scientist team, Japan Agency for Marine‐Earth Science Technology Yokosuka Japan
  • Yoshinori Sanada
    NGHP‐02 scientist team, Japan Agency for Marine‐Earth Science Technology Yokosuka Japan
  • Yohei Hamada
    NGHP‐02 scientist team, Japan Agency for Marine‐Earth Science Technology Yokosuka Japan
  • Yasuyuki Nakamura
    NGHP‐02 scientist team, Japan Agency for Marine‐Earth Science Technology Yokosuka Japan
  • Yuichi Shinmoto
    NGHP‐02 scientist team, Japan Agency for Marine‐Earth Science Technology Yokosuka Japan
  • Hung Yu Wu
    NGHP‐02 scientist team, Japan Agency for Marine‐Earth Science Technology Yokosuka Japan
  • Naokazu Ahagon
    NGHP‐02 scientist team, Japan Agency for Marine‐Earth Science Technology Yokosuka Japan
  • Kan Aoike
    NGHP‐02 scientist team, Japan Agency for Marine‐Earth Science Technology Yokosuka Japan
  • Koichi Iijima
    NGHP‐02 scientist team, Japan Agency for Marine‐Earth Science Technology Yokosuka Japan
  • Hideaki Machiyama
    NGHP‐02 scientist team, Japan Agency for Marine‐Earth Science Technology Yokosuka Japan
  • Maria Luisa Tejada
    NGHP‐02 scientist team, Japan Agency for Marine‐Earth Science Technology Yokosuka Japan
  • Keita Umetsu
    NGHP‐02 scientist team, Japan Agency for Marine‐Earth Science Technology Yokosuka Japan
  • Yoichi Usui
    NGHP‐02 scientist team, Japan Agency for Marine‐Earth Science Technology Yokosuka Japan
  • Yuzuru Yamamoto
    NGHP‐02 scientist team, Japan Agency for Marine‐Earth Science Technology Yokosuka Japan
  • Shuro Yoshikawa
    NGHP‐02 scientist team, Japan Agency for Marine‐Earth Science Technology Yokosuka Japan
  • Francisco Jimenez‐Espejo
    NGHP‐02 scientist team, Japan Agency for Marine‐Earth Science Technology Yokosuka Japan
  • Satoru Haraguchi
    NGHP‐02 scientist team, Japan Agency for Marine‐Earth Science Technology Yokosuka Japan
  • Nobuharu Komai
    NGHP‐02 scientist team, Japan Agency for Marine‐Earth Science Technology Yokosuka Japan
  • Hisami Suga
    NGHP‐02 scientist team, Japan Agency for Marine‐Earth Science Technology Yokosuka Japan
  • Natsue Abe
    NGHP‐02 scientist team, Japan Agency for Marine‐Earth Science Technology Yokosuka Japan
  • Lallan Gupta
    NGHP‐02 scientist team, Japan Agency for Marine‐Earth Science Technology Yokosuka Japan
  • Takehiro Hirose
    NGHP‐02 scientist team, Japan Agency for Marine‐Earth Science Technology Yokosuka Japan
  • Yuka Masaki
    NGHP‐02 scientist team, Japan Agency for Marine‐Earth Science Technology Yokosuka Japan
  • Shun Nomura
    NGHP‐02 scientist team, Japan Agency for Marine‐Earth Science Technology Yokosuka Japan
  • Takamitsu Sugihara
    NGHP‐02 scientist team, Japan Agency for Marine‐Earth Science Technology Yokosuka Japan
  • Wataru Tanikawa
    NGHP‐02 scientist team, Japan Agency for Marine‐Earth Science Technology Yokosuka Japan
  • Yusuke Kubo
    NGHP‐02 scientist team, Japan Agency for Marine‐Earth Science Technology Yokosuka Japan
  • Lena Maeda
    NGHP‐02 scientist team, Japan Agency for Marine‐Earth Science Technology Yokosuka Japan
  • Sean Toczko
    NGHP‐02 scientist team, Japan Agency for Marine‐Earth Science Technology Yokosuka Japan

書誌事項

公開日
2019-01
資源種別
journal article
権利情報
  • http://onlinelibrary.wiley.com/termsAndConditions#vor
DOI
  • 10.1029/2018gc007772
公開者
American Geophysical Union (AGU)

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説明

<jats:title>Abstract</jats:title><jats:p>Detailed reconstruction of Indian summer monsoons is necessary to better understand the late Quaternary climate history of the Bay of Bengal and Indian peninsula. We established a chronostratigraphy for a sediment core from Hole 19B in the western Bay of Bengal, extending to approximately 80 kyr BP and examined major and trace element compositions and clay mineral components of the sediments. Higher δ<jats:sup>18</jats:sup>O values, lower TiO<jats:sub>2</jats:sub> contents, and weaker weathering in the sediment source area during marine isotope stages (MIS) 2 and 4 compared to MIS 1, 3, and 5 are explained by increased Indian summer monsoonal precipitation and river discharge around the western Bay of Bengal. Clay mineral and chemical components indicate a felsic sediment source, suggesting the Precambrian gneissic complex of the eastern Indian peninsula as the dominant sediment source at this site since 80 kyr. Trace element ratios (Cr/Th, Th/Sc, Th/Co, La/Cr, and Eu/Eu*) indicate increased sediment contributions from mafic rocks during MIS 2 and 4. We interpret these results as reflecting the changing influences of the eastern and western branches of the Indian summer monsoon and a greater decrease in rainfall in the eastern and northeastern parts of the Indian peninsula than in the western part during MIS 2 and 4.</jats:p>

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