Magnetic properties of early Pliocene sediments from IODP Site U1467 (Maldives platform) reveal changes in the monsoon system

Luca Lanci, E. Zanella, L. Jovane, Simone Galeotti, Montserrat Alonso-García, Carlos A. Alvarez-Zarikian, Nagender Nath Bejugam, Christian Betzler, Or M. Bialik, Clara L. Blättler, Gregor P. Eberli, Junhua Adam Guo, Sébastien Haffen, S. Horozal, Mayuri Inoue, Dick Kroon, Juan Carlos Laya, Anna Ling Hui Mee, Thomas Lüdmann, Masatoshi NakakuniK. Niino, Loren M. Petruny, Santi D. Pratiwi, John J.G. Reijmer, Jesús Reolid, Angela L. Slagle, Craig R. Sloss, X. Su, Peter K. Swart, James D. Wright, Zhengquan Yao, Jeremy R. Young

Research output: Contribution to journalArticlepeer-review

1 Citation (Scopus)

Abstract

We report a study of the magnetic stratigraphy and the anisotropy of isothermal remanent magnetization of Pliocene sediments from International Ocean Discovery Program (IODP) Site U1467 drilled in the Maldives platform (Indian Ocean) during Exp. 359. Magnetic stratigraphy gives a precise record of geomagnetic reversals of the early Pliocene from approximately 5.3 Ma to 3.1 Ma providing a detailed age model in an interval where the biostratigraphic record is scarce. We use the anisotropy of isothermal remanent magnetization (AIRM) to investigate the statistical orientation of fine magnetic particles and provide data on the strength and direction of bottom currents during the early Pliocene. The strength of bottom currents recorded by the AIRM, shows a prominent increase at the top of Chron C3n.1n (about 4.2 Ma), and the current direction (NE - SW) is consistent with that of modern instrumental measurements. Since bottom currents in the Maldives are driven by the monsoon, we speculate that the 4.2 Ma increase of bottom currents could mark the onset of the present-day setting, probably related to the coeval uplift phase of the Himalayan plateau.

Original languageEnglish
Article number109283
JournalPalaeogeography, Palaeoclimatology, Palaeoecology
Volume533
DOIs
Publication statusPublished - Nov 1 2019

Keywords

  • Anisotropy of isothermal remanent magnetization
  • Currents strength
  • Monsoon
  • Paleomagnetism
  • Pliocene magnetic stratigraphy

ASJC Scopus subject areas

  • Oceanography
  • Ecology, Evolution, Behavior and Systematics
  • Earth-Surface Processes
  • Palaeontology

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