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PreprintCited by 4Paleontology and Stratigraphy of FossilsGeological formations and processesGeochemistry and Elemental Analysis

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Environmental Conditions in the Pre-jenkyns Event Times (Late Pliensbachian – Early Toarcian) in the Southiberian Palaeomargin (Betic External Zones, Southern Spain)

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Nieto, Luis M., Ayadi, Chaima, Fraguas, Agela, Molina, José Miguel, Reolid, Matías·2024·Journal of Iberian Geology
DOI 10.21203/rs.3.rs-4182071/v1

Preprint — published as 10.1007/s41513-024-00254-w · Paper page

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Abstract

Three stratigraphic sections of the Betic External Zones have been studied, two from the Median Subbetic (PEL and PR) and one from the External Subbetic (CE). The upper Pliensbachian materials and the transition to the lower Toarcian have been dated with calcareous nannofossils in PEL and PR in this paper, while in the CE section, previous ammonite and nannofossil biostratigraphies have been considered. The dominant facies are alternance of marly limestone - marl, although in the CE section, the Toarcian is represented by marls, where the Jenkyns Event has been recorded. In terms of ichnofossils, in the PEL section Macaronichnus predominates. In the PR and CE sections, the ichnoassemblages are dominated by Planolites, Thalassinoides and Chondrites. Therefore, the facies and ichnofacies observed were generated in pelagic or hemipelagic marine environments. Analysis of the correlation between δ 13 C and δ 18 O and of each of them with Sr and Fe/Ca and Sr/Ca, as well as the Z-factor, indicate that the geochemical signal has not been modified by diagenesis. In the PEL and PR sections, the δ 13 C and δ 18 O ratios do not allow to clearly identify isotopic events, except in CE where the Jenkyns Event was recorded. The proxies used to study detritism (Zr/Rb, Sr/Cu, CIA and C-value) show trends opposite to those detected in other Tethys sections and even between them. These peculiarities in the geochemical data are interpreted as the result of the opening of the Hispanic Corridor, the mixing of Panthalassa and Tethys seawaters and extensional tectonics, which favoured the development of half grabens with significant differential subsidence, especially during the NJT5b Subzone (latest Pliensbachian). These half grabens could be affected by contourite currents according to the Macaronichnus assemblage in some of these sections.

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Metadata

Authors
Nieto, L. M., Ayadi, C., Fraguas, A., Molina, J. M., & Reolid, M.
Affiliations
  • Universidad de Jaén (ES)
  • Rey Juan Carlos University: Universidad Rey Juan Carlos
Corresponding author
  • Nieto, Luis M.
  • Ayadi, Chaima
  • Molina, José Miguel
  • Reolid, Matías
ORCID
Venue
Journal of Iberian Geology
Publisher
Springer Science and Business Media LLC
Published
2024-04-08
Volume
50
Issue
3
Pages
503-528
ISSN
1698-6180 (ISSN-L)
DOI
10.21203/rs.3.rs-4182071/v1
OpenAlex
W4403532619
Cited by
4
References
1
Citations by year
2026: 3 · 2025: 1
FWCI
1.26
Type
journal article
Language
en
Open access
Licence
Locations
  • Journal of Iberian Geology (publishedVersion, cc-by)
  • Research Square (acceptedVersion, cc-by)
  • RUJA. Institutional Repository of Scientific Production of the University of Jaén (University of Jaén) (acceptedVersion, public-domain)
Funders
  • Universidad Complutense de Madrid (UCM-900431)
  • Universidad de Jaén (RNM-200)
  • Junta de Andalucía (PY20_00111, RNM-200)
Topics
  • Physical Sciences › Earth and Planetary Sciences › Paleontology › Paleontology and Stratigraphy of Fossils
  • Physical Sciences › Earth and Planetary Sciences › Earth-Surface Processes › Geological formations and processes
  • Physical Sciences › Earth and Planetary Sciences › Geochemistry and Petrology › Geochemistry and Elemental Analysis
Keywords
Late Jurassic, Pliensbachian, Toarcian, South Iberian Palaeomargin, calcareous nannofossils, ichnofacies, Planolites, Thalassinoides, chondrites, carbon and oxygen isotopes, Z' factor, chemical index of alteration, half-graben, extensional tectonics, marine facies

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This page
CoChat. (2026). Citation check: Environmental Conditions in the Pre-jenkyns Event Times (Late Pliensbachian – Early Toarcian) in the Southiberian Palaeomargin (Betic External Zones, Southern Spain). https://app.cochat.ai/papers/10.21203/rs.3.rs-4182071/v1
The paper
Nieto, L. M., Ayadi, C., Fraguas, A., Molina, J. M., & Reolid, M. (2024). Environmental Conditions in the Pre-jenkyns Event Times (Late Pliensbachian – Early Toarcian) in the Southiberian Palaeomargin (Betic External Zones, Southern Spain). Journal of Iberian Geology. https://doi.org/10.21203/rs.3.rs-4182071/v1

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