Preprints
https://doi.org/10.5194/cp-2021-161
https://doi.org/10.5194/cp-2021-161

  07 Dec 2021

07 Dec 2021

Review status: this preprint is currently under review for the journal CP.

Terrestrial records of glacial terminations V and IV and insights on deglacial mechanisms

Fabrizio Marra1, Alison Pereira2,3, Brian Jicha4, Sebastien Nomade5, Italo Biddittu6, Fabio Florindo1, Giovanni Muttoni7, Elizabeth Niespolo8,9, Paul Renne8,9, and Vincent Scao5 Fabrizio Marra et al.
  • 1Istituto Nazionale di Geofisica e Vulcanologia, Rome, Italy
  • 2Université Paris-Saclay, CNRS UMR 8148, GEOPS, France
  • 3Département Hommes et environnements, Muséum national d’Histoire naturelle, Paris, France
  • 4Department of Geoscience, University of Wisconsin‐Madison, USA
  • 5CEA Saclay, LSCE, UMR-8212, UVSQ-IPSL et Université Paris Saclay, Gif-sur-Yvette Cedex, France
  • 6Istituto Italiano di Paleontologia Umana, Anagni, Italy
  • 7Department of Earth Sciences, University of Milan, Milan, Italy
  • 8Department of Earth and Planetary Science, University of California, Berkeley, USA
  • 9Berkeley Geochronology Center, Berkeley, USA

Abstract. 40Ar/39Ar geochronology constraints to aggradational phases and grainsize variations show that the sedimentary filling of the Liri fluvial-lacustrine basin (central Italy) recorded the occurrence of deglaciation events associated with global meltwater pulses.

Integrating these data with those from the Tiber River catchment basin, we find a precise match between the ages of gravel deposition and the occurrence of moderate sea-level rise events which anticipate those more marked during the glacial termination V and IV in the Red Sea relative sea level curve.

Such correspondence suggests that gravel deposition is facilitated by melting of Apennine mountain range glaciers, which provide the water transport energy and a surplus of clastic input to the rivers draining the mountain regions and flowing into the Tyrrhenian Sea. Therefore, the thick gravel beds intercalated in the sedimentary filling of the catchment basins of the major rivers in central Italy may be regarded as an equivalent proxy of large deglaciation events, similar to the ice-rafted debris in northern Atlantic.

Consistent with this hypothesis, we also show the close correspondence between the occurrence of particularly mild (warmer) minima of the mean summer insolation at 65° N and these early aggradational phases, as well as with other anomalous early sea-level rises occurred 750 ka and 540 ka at the onset of glacial termination VIII and VI, and 40 ka at the onset of the so-called Heinrich events.

Fabrizio Marra et al.

Status: open (until 19 Feb 2022)

Comment types: AC – author | RC – referee | CC – community | EC – editor | CEC – chief editor | : Report abuse
  • RC1: 'Comment on cp-2021-161', Anonymous Referee #1, 12 Jan 2022 reply
    • AC1: 'Reply on RC1', Fabrizio Marra, 13 Jan 2022 reply

Fabrizio Marra et al.

Fabrizio Marra et al.

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Short summary
We demonstrate that coarse gravel deposition in the catchment basins of the major rivers of central Italy is a direct proxy of global deglaciation events associated with meltwater pulses. By precise 40Ar/39Ar dating of the sedimentary deposits we show that emplacement of these gravel beds is closely coincident with discrete events of sea-level rise, with peaks of the Ice-rafted debris (IRD) curve, and with particularly mild (warmer) minima of mean summer insolation at 65° N.