Changes in rainfall seasonality inferred from weathering and pedogenic trends in mid-Miocene paleosols of La Tatacoa, Colombia

Salazar-Jaramillo, Susana; Śliwiński, Maciej G.; Hertwig, A. T.; Garzón, Cristian C.; Gómez, Christian; Bonilla, Germán; Guerrero, Javier

doi:10.1016/j.gloplacha.2021.103711

Cited by 5 publications

(1 citation statement)

References 47 publications

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“…Paleosols in the Magdalena Valley (Colombia) are representative of this cooling trend, showing a switch from reducing to oxidizing conditions in the mid-Miocene (∼13.1 Ma), at a time when the Magdalena region was still connected with the Amazon. This transition, from humid to arid climate, is thought to be related to a shift in the Intertropical Convergence Zone (Salazar- Jaramillo et al 2022). Likewise, the La Guajira Desert (Caribbean coast) (Figure 2) once hosted a humid tropical rainforest that turned into a desert somewhere between the Miocene and Pliocene (17.3 and 3 Ma) .…”

Section: Figurementioning

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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Section: Figurementioning

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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Characterization of the palaeoenvironmental conditions in the Pannonian Basin during the last 34 mys related to the formation of haematitic and kaolinitic sedimentary rocks

Tràjer

2023

Int J Earth Sci (Geol Rundsch)

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The Pannonian Basin is a sediment-filled back-arc basin which was formed during the Late Paleogene–Neogene period. Such sedimentary rocks like bauxites or kaolinites, which are important with regard to industry in the region, are the products of former weathering processes. However, our knowledge about the palaeoenvironmental conditions which led to the formation of these mineral resources has not yet been integrated. For this purpose, the former biomes, climatic classes as well as karstification, weathering and paedogenic processes were investigated over the last 34 mys using the southeastern regions of China and the United States as climatically analogous regions. By the second half of the Oligocene, the conditions of intensive chemical weathering ceased to exist in the Pannonian Basin, which enabled the formation of lateritic bauxites during earlier periods. However, up to the mid-Serravallian Stage, intensive karstification as well as the formation of haematite-rich ultisols and alfisols continued when humid subtropical climatic conditions came about. The modelled biomes indicate that aridification during the Early to Middle Miocene led to the formation of less dense vegetation, exacerbating the re-deposition of weathering products. These conditions resulted in the accumulation of haematitic and kaolinitic sedimentary rocks in the fossilized karst depressions. The progressive cooling following the mid-Pliocene decreased the intensity of karstification, moreover, the cessation of humid subtropical conditions brought the sedimentation of haematitic and kaolinitic sedimentary rocks in the Pannonian Basin to an end.

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Climatic, depositional and environmental controls on early carbonate cementation in fluvial and shallow marine sandstones

Janssen

Caracciolo

Bonnell³

et al. 2023

Marine and Petroleum Geology

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Changes in rainfall seasonality inferred from weathering and pedogenic trends in mid-Miocene paleosols of La Tatacoa, Colombia

Cited by 5 publications

References 47 publications

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

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

Characterization of the palaeoenvironmental conditions in the Pannonian Basin during the last 34 mys related to the formation of haematitic and kaolinitic sedimentary rocks

Climatic, depositional and environmental controls on early carbonate cementation in fluvial and shallow marine sandstones

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