Preprints
https://doi.org/10.5194/cp-2021-161
https://doi.org/10.5194/cp-2021-161
07 Dec 2021
 | 07 Dec 2021
Status: this preprint was under review for the journal CP. A final paper is not foreseen.

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

Fabrizio Marra, Alison Pereira, Brian Jicha, Sebastien Nomade, Italo Biddittu, Fabio Florindo, Giovanni Muttoni, Elizabeth Niespolo, Paul Renne, and Vincent Scao

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.

This preprint has been withdrawn.

Publisher's note: Copernicus Publications remains neutral with regard to jurisdictional claims made in the text, published maps, institutional affiliations, or any other geographical representation in this preprint. The responsibility to include appropriate place names lies with the authors.
Fabrizio Marra, Alison Pereira, Brian Jicha, Sebastien Nomade, Italo Biddittu, Fabio Florindo, Giovanni Muttoni, Elizabeth Niespolo, Paul Renne, and Vincent Scao

Interactive discussion

Status: closed

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
    • AC1: 'Reply on RC1', Fabrizio Marra, 13 Jan 2022
  • AC2: 'Comment on cp-2021-161', Fabrizio Marra, 01 Feb 2022
  • CC1: 'Comment on cp-2021-161', Gianluca Marino, 19 Feb 2022
    • AC3: 'Reply on CC1', Fabrizio Marra, 19 Feb 2022
  • RC2: 'Comment on cp-2021-161', Anonymous Referee #2, 24 Feb 2022
    • AC4: 'Reply on RC2', Fabrizio Marra, 25 Feb 2022
  • AC5: 'Comment on cp-2021-161', Fabrizio Marra, 03 Mar 2022
    • EC1: 'Reply on AC5', Alberto Reyes, 08 Mar 2022
      • AC6: 'Reply on EC1', Fabrizio Marra, 08 Mar 2022
      • CC2: 'Reply on EC1', Fabio Florindo, 04 May 2022
  • AC7: 'Comment on cp-2021-161', Fabrizio Marra, 24 Apr 2022
  • AC8: 'Comment on cp-2021-161', Fabrizio Marra, 06 May 2022
  • RC3: 'reviewer/editor comment on cp-2021-161', Alberto Reyes, 12 May 2022
    • AC9: 'Reply on RC3', Fabrizio Marra, 27 May 2022

Interactive discussion

Status: closed

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
    • AC1: 'Reply on RC1', Fabrizio Marra, 13 Jan 2022
  • AC2: 'Comment on cp-2021-161', Fabrizio Marra, 01 Feb 2022
  • CC1: 'Comment on cp-2021-161', Gianluca Marino, 19 Feb 2022
    • AC3: 'Reply on CC1', Fabrizio Marra, 19 Feb 2022
  • RC2: 'Comment on cp-2021-161', Anonymous Referee #2, 24 Feb 2022
    • AC4: 'Reply on RC2', Fabrizio Marra, 25 Feb 2022
  • AC5: 'Comment on cp-2021-161', Fabrizio Marra, 03 Mar 2022
    • EC1: 'Reply on AC5', Alberto Reyes, 08 Mar 2022
      • AC6: 'Reply on EC1', Fabrizio Marra, 08 Mar 2022
      • CC2: 'Reply on EC1', Fabio Florindo, 04 May 2022
  • AC7: 'Comment on cp-2021-161', Fabrizio Marra, 24 Apr 2022
  • AC8: 'Comment on cp-2021-161', Fabrizio Marra, 06 May 2022
  • RC3: 'reviewer/editor comment on cp-2021-161', Alberto Reyes, 12 May 2022
    • AC9: 'Reply on RC3', Fabrizio Marra, 27 May 2022
Fabrizio Marra, Alison Pereira, Brian Jicha, Sebastien Nomade, Italo Biddittu, Fabio Florindo, Giovanni Muttoni, Elizabeth Niespolo, Paul Renne, and Vincent Scao
Fabrizio Marra, Alison Pereira, Brian Jicha, Sebastien Nomade, Italo Biddittu, Fabio Florindo, Giovanni Muttoni, Elizabeth Niespolo, Paul Renne, and Vincent Scao

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This preprint has been withdrawn.

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.