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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)

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Date
2021-01-01
Authors
Cuitiño, JI
Raigemborn, MS
Bargo, MS
Vizcaíno, SF
Muñoz, NA
Kohn, MJ
Kay, RF
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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.
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Journal article
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https://hdl.handle.net/10161/26492
Published Version (Please cite this version)
10.1144/jgs2020-188
Publication Info
Cuitiño, JI; Raigemborn, MS; Bargo, MS; Vizcaíno, SF; Muñoz, NA; Kohn, MJ; & Kay, RF (2021). Insights on the controls on floodplain-dominated fluvial successions: A perspective from the early–middle miocene santa cruz formation in río chalía (patagonia, argentina). Journal of the Geological Society, 178(4). 10.1144/jgs2020-188. Retrieved from https://hdl.handle.net/10161/26492.
This is constructed from limited available data and may be imprecise. To cite this article, please review & use the official citation provided by the journal.
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Scholars@Duke

Kay

Richard Frederick Kay

Professor of Evolutionary Anthropology
I have two areas of research:1) the evolution of primates in South America; and 2) the use of primate anatomy to reconstruct the phylogenetic history and adapations of living and extinct primates, especially Anthropoidea. 1) Evolution of primates and mammalian faunal evolution, especially in South America. For the past 30 years, I have been engaged in research in Argentina, Bolivia The Dominican Republic, Peru, and Colombia with three objectives:a) to reconstruct the evol
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