Insights on the controls on floodplain-dominated fluvial successions: A perspective from the early–middle miocene santa cruz formation in río chalía (patagonia, argentina)

dc.contributor.author

Cuitiño, JI

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Raigemborn, MS

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Bargo, MS

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Vizcaíno, SF

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Muñoz, NA

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Kohn, MJ

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Kay, RF

dc.date.accessioned

2023-01-22T13:25:27Z

dc.date.available

2023-01-22T13:25:27Z

dc.date.issued

2021-01-01

dc.date.updated

2023-01-22T13:25:21Z

dc.description.abstract

The Santa Cruz Formation (SCF) in Río Chalía (Austral Basin, Patagonia, Argentina) is a well-exposed fluvial succession with abundant and diverse fossil vertebrates accumulated during the Miocene Climatic Optimum (MCO). Using facies analysis, characterization of stratigraphic architecture, U–Pb geochronology and vertebrate palaeontology, we assess the timing and interplay of controlling factors on the sedimentation, including tectonics, global sea level, climate and sediment supply. Throughout the succession, there occurred a constant aggradation of the floodplain-dominated fluvial system. Seven zircon U–Pb ages constrain the time of accumulation between c. 18 and 15.2 Ma, under a relatively constant sedimentation rate of 150 ± 50 m myr–1 . The large number of fossil vertebrates indicates a Santacrucian fauna, showing no recognizable changes through the section. The basin-scale, low-gradient anastomosed fluvial system of the SCF records a period of about 3 myr of relatively constant environmental conditions controlled by continuous basin subsidence and high sediment supply conditioned by explosive volcanism together with weathering of uplifting terrains in the Andes. In addition, the system was influenced by a temperate to warm and subhumid climate favoured by the MCO before the onset of the Andean rain shadow, together to high global sea levels.

dc.identifier.issn

0016-7649

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2041-479X

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https://hdl.handle.net/10161/26492

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en

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Geological Society of London

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Journal of the Geological Society

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10.1144/jgs2020-188

dc.title

Insights on the controls on floodplain-dominated fluvial successions: A perspective from the early–middle miocene santa cruz formation in río chalía (patagonia, argentina)

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Journal article

duke.contributor.orcid

Kay, RF|0000-0002-4219-7580

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4

pubs.organisational-group

Duke

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Nicholas School of the Environment

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Trinity College of Arts & Sciences

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Evolutionary Anthropology

pubs.organisational-group

Earth and Climate Sciences

pubs.publication-status

Published

pubs.volume

178

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