Upper Pleistocene in Mallorca: Sedimentary variability of littoral units in relation to different structural contexts.

Abstract

<p>[eng] This comprehensive study explores the Upper Pleistocene geological history of Mallorca, employing a multidisciplinary</p><p>approach that integrates previous findings with new insights. The research spans various coastal</p><p>regions, focusing on four distinct study areas characterized by different geomorphological and structural contexts.</p><p>The first structural context, exemplified by Port des Canonge, showcases a fold and thrust sedimentary</p><p>succession, resulting in prominent cliffs with Jurassic and Triassic formations. The second context, observed in</p><p>Caloscamps, features smoother reliefs and notable terrestrial sediment input. Meanwhile, the third context,</p><p>represented by Punta de s’Avançada and Punta de n’Amer, exhibits cliffs carved on Upper Miocene tabular units</p><p>devoid of terrestrial sediment input. The main objective is to provide a comprehensive understanding of the</p><p>geological and sedimentological characteristics of the Upper Pleistocene units across the Mallorca coastal regions</p><p>by investigating different study areas located along the west, north-west, north-east, and east coasts, in distinct</p><p>geomorphological and geological contexts using sedimentological methodologies: stratigraphic analysis, X-ray</p><p>diffraction analysis, microscopic techniques, and assessment of sediment color. Additionally, Optically Stimulated</p><p>Luminescence (OSL) dating techniques are employed, providing a precise temporal framework spanning</p><p>Marine Isotope Stage 6 (MIS 6) to Marine Isotope Stage 3 (MIS 3). The findings reveal the complex interplay of</p><p>environmental factors, climatic variations, and geological evolution across Mallorca. Colluvial deposits and</p><p>paleosols reflect climatic shifts. Alluvial fans and aeolianites highlight periods of intense sediment transport and</p><p>deposition linked to climate fluctuations. Finally, to provide a comprehensive overview of the outcrops present</p><p>on the island, a stratigraphic correlation of the mentioned areas was conducted. In conclusion, the study enhances</p><p>our comprehension of the regional coastal dynamics, geological composition, and environmental history,</p><p>providing invaluable contributions to the broader understanding of Pleistocene deposits.</p>