Middle to late Miocene Caribbean dinoflagellate assemblages and palynofacies (DSDP Leg 15 Site 153)

Leandro, Lilian M.; Santos, Alessandra; Carvalho, Marcelo de Araújo; Fauth, Gerson

doi:10.1016/j.marmicro.2020.101898

Cited by 14 publications

(5 citation statements)

References 69 publications

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“…The age of DSDP Site 153 was obtained through planktonic foraminifera (Edgar and Saunders, 1973), based on the stratigraphic scheme from the Caribbean (Bolli and Premoli-Silva, 1973), and correlated to the global zonation scheme (Bolli and Saunders, 1985). Besides, we confirm the age established through dinoflagellate zones (Leandro et al, 2020). The age of DSDP Site 321 was obtained from Radiolarian zones (Yeats and Hart, 1976), and DSDP Site 354 was dated with foraminifera and calcareous nannofossils zones (Perch-Nielsen, et al, 1977).…”

Section: Biostratigraphy and Age Controlssupporting

confidence: 74%

Multi-proxy evidence of Caribbean-sourced marine incursions in the Neogene of Western Amazonia, Brazil

Leandro

Linhares

Mota

et al. 2022

Geology

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The timing of continental-scale marine flooding events in Western Amazonia during the Neogene is still an unsolved question. Despite broad proxy-based evidence of such events, the pathways and duration of late Miocene marine incursions remain controversial. We provide coupled calcareous and organic microfossil and geochemical data from six onshore cores from Neogene sequences of the Solimões Basin, Brazil. Our records support minor marine influence in the early Miocene (23.0, 21.1, 18.6, and 16.3 Ma), middle Miocene (14.9, 13.7, and 12.9 Ma) and early Pliocene (4.7, 4.2–4.1, and 3.8 Ma), and conspicuous marine incursions in the late Miocene (11.1–8.8 Ma) suggested by the consistent presence of salinity-indicative microfossils and geochemical data. Our findings challenge the view of major marine incursions in the early and middle Miocene in the studied area. We propose for the first time a new late Miocene incursion (LMI) event as the main marine flooding event in Western Amazonia during the Neogene. These onshore records are compared with three offshore cores from the Atlantic and Pacific Oceans. The similarity between microfossil assemblages of the Solimões Basin and the Caribbean Sea, and evidence of increased runoff from the Orinoco river drainage system, strongly suggest the Caribbean Sea as the primary source area of the marine incursions, supporting a Venezuelan seaway. We further show for the first time the potential linkage between Neogene marine incursions (mainly the LMI) into the Solimões Basin and major disturbances in the global carbon cycle.

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Section: Biostratigraphy and Age Controlssupporting

confidence: 74%

Multi-proxy evidence of Caribbean-sourced marine incursions in the Neogene of Western Amazonia, Brazil

Leandro

Linhares

Mota

et al. 2022

Geology

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“…IndVal was introduced by 72 to determine whether species are characteristic of particular sample groups. The technique has been applied recently to fossil material 6 , 72 – 75 and can provide evidence of alterations in the biota, paleoenvironment, paleoclimate, and paleoceanography. In this study, the paleoclimatic phases (pre-evaporitic, evaporitic, and post-evaporitic phases) were used as sample groups.…”

Section: Methodsmentioning

confidence: 99%

Influence of the intertropical convergence zone on early cretaceous plant distribution in the South Atlantic

Carvalho

Lana

Sá

et al. 2022

Sci Rep

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The influence of the Intertropical Convergence Zone (ITCZ) in the emerging South Atlantic region during the late Aptian (Early Cretaceous) is reflected in the spatio-temporal distribution of plant communities recorded in eight Brazilian sedimentary basins. The distribution of the bioclimatic groups of hygrophytes, hydrophytes, tropical lowland flora, upland flora, and xerophytes was quantified using pollen and spores. A predominance of xerophytes from the tropical xerophytic shrubland biome characterized the pre-evaporitic, evaporitic, and post-evaporitic paleoclimatic phases, in particular the evaporitic phase. The region experienced humidity events in the pre-evaporitic and post- evaporitic phases, especially near the paleoequator, where the tropical rainforest biome with two phytophysiognomies (lowland and montane rainforests) prevailed. Increasing humidity had a positive effect on plant diversity.

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“…Specificity refers to the extent to which a species is associated with a particular habitat or condition, while fidelity represents the probability of finding a species in a habitat given its occurrence in the overall study area. The IndVal index has demonstrated successful applications in palynological studies (Caron and Jackson, 2007;Roucoux et al, 2013;Carvalho et al, 2017;Trindade and Carvalho, 2018;Leandro et al, 2020). In our study, the In-dVal index was employed to assess the degree of association between taxa and specific sample groups corresponding to different paleoclimatic phases.…”

Section: Indicator Speciesmentioning

confidence: 99%

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

Cardoso da Silva Giannerini,

de Araujo Carvalho,

Cunha Lana

et al. 2023

Clim. Past

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Abstract. This study conducted high-resolution paleoclimatic analyses based on the identification of palynological groups of late Aptian age (biozone Sergipea veriverrucata) in the Bragança and Codó formations within the Bragança–Viseu, São Luís, and Parnaíba basins. The analysis comprised 40 palynological samples, with 200 palynomorphs per slide counted when possible. Bioclimatic analysis was mainly supported by the identification of botanical affinities, and ecological and climatic parameters such as the wet/arid trend (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.

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Middle to late Miocene Caribbean dinoflagellate assemblages and palynofacies (DSDP Leg 15 Site 153)

Cited by 14 publications

References 69 publications

Multi-proxy evidence of Caribbean-sourced marine incursions in the Neogene of Western Amazonia, Brazil

Multi-proxy evidence of Caribbean-sourced marine incursions in the Neogene of Western Amazonia, Brazil

Influence of the intertropical convergence zone on early cretaceous plant distribution in the South Atlantic

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

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