Palynostratigraphy of two Neogene boreholes from the northwestern portion of the Solimões Basin, Brazil

Leandro, Lilian M.; Vieira, Carlos Eduardo Lucas; Santos, Alessandra; Fauth, Gerson

doi:10.1016/j.jsames.2018.11.016

Cited by 20 publications

(13 citation statements)

References 30 publications

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“…The Asteraceae zone which corresponds to the middle Tortonian-late Messinian period is very uncommon in the Brazilian Amazon palynofloras and there are only three records of the Asteraceae zone coming from three boreholes of the southwestern part of the Amazonas state (Leandro et al, 2019). In summary, we can conclude that an association of Compositae-Polylepis-Cyclusphaera characterizes the Achiri palynoflora which can be dated from the late middle to early late Miocene?.…”

Section: Palynostratigraphymentioning

confidence: 79%

Occurrence of Cyclusphaera scabrata in Achiri (late middle-early late Miocene?, Bolivian Altiplano): Paleogeographical implication

Prámparo

Antoine

Marivaux

et al. 2022

Journal of South American Earth Sciences

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Section: Palynostratigraphymentioning

confidence: 79%

Occurrence of Cyclusphaera scabrata in Achiri (late middle-early late Miocene?, Bolivian Altiplano): Paleogeographical implication

Prámparo

Antoine

Marivaux

et al. 2022

Journal of South American Earth Sciences

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“…Eighty-four cores were drilled in the Solimões Basin (Figure 2), representing the only continuous and high-quality sedimentary archive for this region to date. These cores, combined with outcrop data, provided a basis for multiple palynological and lithological studies that permitted relative age determination of the sediments, paleoecological and paleoenvironmental reconstructions (e.g., Hoorn 1993;Da Silva-Caminha et al 2010;Jaramillo et al 2010Jaramillo et al , 2017d'Apolito 2016, Leite et al 2017, 2021Linhares et al 2017Linhares et al , 2019Leandro et al 2019Leandro et al , 2022d'Apolito et al 2021) (Supplemental Table 2), provenance analyses (Andean or Amazon source), and absolute age determination of the sediments based on isotope data (Roddaz et al 2005, Horbe et al 2019, Kern et al 2020. A schematic overview of the lithology, sediment ages, and phytogeographic and interpretation through time is presented in Figure 3.…”

Section: Insights Into Deep Time Amazonian Florasmentioning

confidence: 99%

Neogene History of the Amazonian Flora: A Perspective Based on Geological, Palynological, and Molecular Phylogenetic Data

Hoorn

Lohmann

Boschman

et al. 2023

Annual Review of Earth and Planetary Sciences

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The Amazon hosts one of the largest and richest rainforests in the world, but its origins remain debated. Growing evidence suggests that geodiversity and geological history played essential roles in shaping the Amazonian flora. Here we summarize the geo-climatic history of the Amazon and review paleopalynological records and time-calibrated phylogenies to evaluate the response of plants to environmental change. The Neogene fossil record suggests major sequential changes in plant composition and an overall decline in diversity. Phylogenies of eight Amazonian plant clades paint a mixed picture, with the diversification of most groups best explained by constant speciation rates through time, while others indicate clade-specific increases or decreases correlated with climatic cooling or increasing Andean elevation. Overall, the Amazon forest seems to represent a museum of diversity with a high potential for biological diversification through time. To fully understand how the Amazon got its modern biodiversity, further multidisciplinary studies conducted within a multimillion-year perspective are needed. ▪ The history of the Amazon rainforest goes back to the beginning of the Cenozoic (66 Ma) and was driven by climate and geological forces. ▪ In the early Neogene (23–13.8 Ma), a large wetland developed with episodic estuarine conditions and vegetation ranging from mangroves to terra firme forest. ▪ In the late Neogene (13.8–2.6 Ma), the Amazon changed into a fluvial landscape with a less diverse and more open forest, although the details of this transition remain to be resolved. ▪ These geo-climatic changes have left imprints on the modern Amazonian diversity that can be recovered with dated phylogenetic trees. ▪ Amazonian plant groups show distinct responses to environmental changes, suggesting that Amazonia is both a refuge and a cradle of biodiversity.

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“…Rich and well-preserved fossil record of the Solimões Formation includes plant fossils, pollen grains and spores (Hoorn, 1994a,c;Silva-Caminha et al, 2010;Kachniasz and Silva-Caminha, 2016;Sá and Carvalho, 2017;Jaramillo et al, 2017;Leandro et al, 2019), ostracods (Purper, 1977(Purper, , 1979Ramos, 2006;Gross et al, 2011Gross et al, , 2013Gross et al, , 2014Gross et al, , 2015Linhares et al, 2011;, fish scales and fragments, bird fragments, and reptile and mammal teeth and bones (Santos et al, 1991;Monsch, 1998). Microfossil-based studies assigns Neogene age (Miocene-Pliocene: 23-2.6 Ma) to the Solimões Formation.…”

Section: Neogene Andean Orogeny and The Solimões Formationmentioning

confidence: 99%

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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Palynostratigraphy of two Neogene boreholes from the northwestern portion of the Solimões Basin, Brazil

Cited by 20 publications

References 30 publications

Occurrence of Cyclusphaera scabrata in Achiri (late middle-early late Miocene?, Bolivian Altiplano): Paleogeographical implication

Occurrence of Cyclusphaera scabrata in Achiri (late middle-early late Miocene?, Bolivian Altiplano): Paleogeographical implication

Neogene History of the Amazonian Flora: A Perspective Based on Geological, Palynological, and Molecular Phylogenetic Data

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

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