Late Aptian paleoclimate reconstruction of the Brazilian equatorial margin: inferences from palynology

Abstract/Fs/X), Shannon–Wiener diversity, and indicator species analysis (IndVal) were used. Statistical analyses such as principal component and cluster analyses were employed to support the paleoclimatic interpretations. The study recognized 69 genera distributed among the main groups of living plants, including bryophytes, ferns, lycophytes, gymnosperms, and angiosperms. It was possible to attribute botanical affinity in 94.2 % of the taxa, and nine genera occurred in all sections studied: Afropollis, Araucariacites, Callialasporites, Cicatricosisporites, Classopollis, Cyathidites, Deltoidospora, Equisetosporites, and Verrucosisporites, with Classopollis being the most abundant. The stratigraphic distribution of the bioclimatic groups (hydrophytes, hygrophytes, lowland tropical flora, upland flora, and xerophytes) allowed for the identification of climatic phases: pre-evaporitic, evaporitic, and post-evaporitic. In the pre-evaporitic phase, the most significant abundances were between the hygrophytes and upland flora, indicating a certain level of humidity. Xerophytes were the most abundant in all phases, with a conspicuous increase in the evaporitic phase, reflecting an increase in aridity. In the post-evaporitic phase, there was a significant increase in the upland flora with the return of wetter conditions. This study confirmed an increasing humidity trend in the analyzed sections, probably owing to the influence of the Intertropical Convergence Zone that was already operating during the late Aptian.

Angaben zum Objekt

• Standort: Deutsche Nationalbibliothek Frankfurt am Main
• Umfang: Online-Ressource
• Sprache: Englisch

Verweise und Beziehungen

• Erschienen in: Late Aptian paleoclimate reconstruction of the Brazilian equatorial margin: inferences from palynology ; volume:19 ; number:8 ; year:2023 ; pages:1715-1742 ; extent:28 ; Climate of the past ; 19, Heft 8 (2023), 1715-1742 (gesamt 28)

Beteiligte, Orts- und Zeitangaben

• Urheber: Cardoso da Silva Giannerini, Michelle ; de Araujo Carvalho, Marcelo ; Cunha Lana, Cecília ; Santiago, Gustavo ; de Paula Sá, Natália ; da Cunha Correia, Gabriel

Weitere Informationen

• DOI: 10.5194/cp-19-1715-2023
• URN: urn:nbn:de:101:1-2023083104311876564233
• Rechteinformation: Open Access; Der Zugriff auf das Objekt ist unbeschränkt möglich.
• Letzte Aktualisierung: 14.08.2025, 10:55 MESZ