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Preprints
https://doi.org/10.5194/se-2020-106
© Author(s) 2020. This work is distributed under
the Creative Commons Attribution 4.0 License.
https://doi.org/10.5194/se-2020-106
© Author(s) 2020. This work is distributed under
the Creative Commons Attribution 4.0 License.

  02 Jul 2020

02 Jul 2020

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A revised version of this preprint was accepted for the journal SE and is expected to appear here in due course.

Birth and closure of the Kallipetra Basin: Late Cretaceous reworking of the Jurassic Pelagonian – Axios-Vardar contact (Northern Greece)

Lydia R. Bailey1,2, Vincenzo Picotti2, Maria Giuditta Fellin2, Filippo L. Schenker3, Miriam Cobianchi4, and Thierry Adatte5 Lydia R. Bailey et al.
  • 1Department of Geosciences, University of Arizona, Tucson, AZ 85721, USA
  • 2Department of Earth Sciences, Institute of Geology, ETH Zurich, 8092 Zürich, Switzerland
  • 3Institute of Earth Sciences, University of Applied Sciences and Arts of Southern Switzerland, 6952 Canobbio, Switzerland
  • 4Department of Earth and Environmental Sciences, University of Pavia, Pavia, 27100, Italy
  • 5Institute of Earth Sciences, University of Lausanne, 1015 Lausanne, Switzerland

Abstract. Some 20 Ma after the Late Jurassic to Early Cretaceous obduction at the eastern margin of Adria, the eroded Pelagonia (Adria) – Axios-Vardar (Oceanic Complex) contact collapsed, forming the Kallipetra Basin, described around the Aliakmon river near Veroia (Northern Greece). Clastic and carbonate marine sediments deposited from early Cenomanian to end Turonian, with abundant olistoliths and slope failures at the base due to active normal faults. The middle part of the series is characterized by red and green pelagic limestones, with minimal contribution of terrigenous debris. Rudist mounds in the upper part of the basin started forming on the southwestern slope, and their growth was competing with a flux of ophiolitic debris, documenting the new fault scarps affecting the Vardar Oceanic Complex (VOC). Eventually, the basin was closed by overthrusting of the VOC towards the northeast and was buried and heated up to ~ 180 °C. A strong reverse geothermal gradient is recorded by illite crystallinity and zircon fission tracks, with temperatures increasing up-section to near 300 °C at the tectonic contact with the VOC. We interpret this anomaly as due to fluid migration from deeper sources and/or shearing affecting the porous and permeable deposits during early burial diagenesis. This study documents the reworking of the Pelagonian – Axios-Vardar contact, with Cenomanian extension and basin widening followed by Turonian compression and basin inversion. Thrusting occurred earlier than previously reported in the literature for the eastern Adria, and shows a vergence toward the northeast, at odds with the regional southwest vergence of the whole margin.

Lydia R. Bailey et al.

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Lydia R. Bailey et al.

Lydia R. Bailey et al.

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Latest update: 01 Dec 2020
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Short summary
We used geological mapping, biostratigraphy, illite crystallinity and low temperature thermochronology to describe the Kallipetra Basin, located in the Hellenides, for the first time. We document how and when the basin evolved in response to tectonic forcings and basin inversion. The basin formed on a reworked Pelagonian – Axios-Vardar contact during extension in the early Cenomanian, then was closed by overthrusting of the Vardar oceanic complex and basin inversion during the late Turonian.
We used geological mapping, biostratigraphy, illite crystallinity and low temperature...
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