The Anisian continental-marine transition in Sardinia, Italystate of the art, new palynological data and regional chronostratigraphic correlation

  1. L. Stori 1
  2. J. B. Diez 2
  3. M. Juncal 2
  4. R. De la Horra 3
  5. V. Borruel Abadía 4
  6. J. Martín Chivelet 3
  7. J. F. Barrenechea 3
  8. J. López Gómez
  9. A. Ronchi 1
  1. 1 University of Pavia
    info

    University of Pavia

    Pavía, Italia

    ROR https://ror.org/00s6t1f81

  2. 2 Universidade de Vigo
    info

    Universidade de Vigo

    Vigo, España

    ROR https://ror.org/05rdf8595

  3. 3 Universidad Complutense de Madrid
    info

    Universidad Complutense de Madrid

    Madrid, España

    ROR 02p0gd045

  4. 4 Universidad de Salamanca
    info

    Universidad de Salamanca

    Salamanca, España

    ROR https://ror.org/02f40zc51

Journal:
Journal of iberian geology: an international publication of earth sciences

ISSN: 1886-7995 1698-6180

Year of publication: 2022

Volume: 48

Issue: 1

Pages: 79-106

Type: Article

DOI: 10.1007/S41513-021-00184-X DIALNET GOOGLE SCHOLAR lock_openOpen access editor

More publications in: Journal of iberian geology: an international publication of earth sciences

Abstract

The scarce evidence of paleontological records between the upper Permian and the Anisian (Middle Triassic) of Western Europe could refect (1) large stratigraphic gaps in the continental successions and/or (2) the persistence of disturbed conditions after the Permian–Triassic Boundary extinction event and the succession of ecological crises that occurred during the Early Triassic. In this context, the study of palynological associations, integrated with the stratigraphical and sedimentological data, plays a key role in dating and correlating the successions of the Western European domain and improves our understanding of environmental and paleoclimatic conditions. In some cases, pre-Anisian paleontological evidence is lacking, as in Sardinia (Italy), where a long gap encompasses the middle Permian (pars) to late Lower Triassic successions. Although fragmented and disseminated, the continental Lower-Middle Triassic sedimentary successions (Buntsandstein) of Sardinia have proved crucial to our understanding of the evolution of the southern edge of the Paleo-Europe and the diferent timings of the Tethys transgression (Muschelkalk facies) in some of these areas. Various paleogeographic reconstructions were attempted in previous works, without providing any consensus on the precise position of Sardinia and its surrounding seaways in the Western Tethys domain during this time interval. At present, the confguration and distribution of the subsiding and emerging landmasses and the temporal development of the transgressions of the Western Tethys during the Middle Triassic remain unclear. This work focuses on the stratigraphical, sedimentological and palynological aspects of three Middle Triassic continental-marine sedimentary successions in Sardinia, with particular attention to the analysis of the palynological associations sampled there, and it also provides a detailed review of all previous palynological publications on the Sardinian Anisian. The studied successions are: Su Passu Malu section (Campumari, SW Sardinia), Arcu is Fronestas section and Escalaplano section (Escalaplano, Central Sardinia). These sections were also correlated to other signifcant sections in the SW (Scivu Is Arenas) and NW (Nurra) parts of the island.

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