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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
dc.contributor.author Raigemborn, MS
dc.contributor.author Bargo, MS
dc.contributor.author Vizcaíno, SF
dc.contributor.author Muñoz, NA
dc.contributor.author Kohn, MJ
dc.contributor.author 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.identifier.issn 0016-7649
dc.identifier.issn 2041-479X
dc.identifier.uri https://hdl.handle.net/10161/26492
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.language en
dc.publisher Geological Society of London
dc.relation.ispartof Journal of the Geological Society
dc.relation.isversionof 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)
dc.type Journal article
duke.contributor.id Kay, RF|0098912
dc.date.updated 2023-01-22T13:25:21Z
pubs.issue 4
pubs.organisational-group Duke
pubs.organisational-group Nicholas School of the Environment
pubs.organisational-group Trinity College of Arts & Sciences
pubs.organisational-group Evolutionary Anthropology
pubs.organisational-group Earth and Climate Sciences
pubs.publication-status Published
pubs.volume 178
duke.contributor.orcid Kay, RF|0000-0002-4219-7580


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