Facies Holocenas de deglaciación, Tierra de Wilkes, IODP U1357A

  1. J. Gutiérrez-Pastor 1
  2. C. Escutia 1
  3. F. Jiménez Espejo 1
  4. B.K. Khim 2
  5. X. Crosta 3
  6. J. Etourneau 3
  1. 1 Instituto Andaluz de Ciencias de la Tierra (CSIC-UGR)
  2. 2 Pusan National University (Korea)
  3. 3 University of Bordeaux
    info

    University of Bordeaux

    Burdeos, Francia

    ROR https://ror.org/057qpr032

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Journal:
Geotemas (Madrid)

ISSN: 1576-5172

Year of publication: 2021

Issue Title: X Congreso Geológico de España

Issue: 18

Pages: 1128

Type: Article

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More publications in: Geotemas (Madrid)

Abstract

We aim to contribute to the understanding of the drivers and dynamic of marine-based East Antarctic Ice sheet (EAIS) loss along with its contribution to global sea level rise and biological impacts during the post Last Glacial Maximum (LGM) deglaciation (~24 kyr-12 kyr). Holocene sediments above the LGM diamicton at Site U1357A (IODP Expedition 318), loca- ted on east Antarctic Wilkes Land margin continental shelf, are 180 m thick, being one of the highest resolution (annual to millennial) sedimentary records in the Southern Ocean close to Antarctica over the last ~12 kyr (Escutia, 2011). To infer past ice-sheet dynamic we focus on facies characterization based on high resolution digital images, CT Scans, XRF core-scanner, grain size analyses and physical properties while congruent paleo-environmental conditions are reconstructed through dia- tom counts, HBI and biogenic silica data. Additional 14 C ages are being processed to constrain the age model. Preliminary facies analysis of the deglaciation sediments (cores 19-20H, 160,22 - 185,45 mbsf) reveals two pulses of sand/silt sediments mixed with ice rafted debris (IRD). These pulses interrupt the rhythmic laminated diatom ooze sediments above the poorly sorted gravelly siltstone diamicton.

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