Fluvial systems variations in the Rio Leona Formation: Tectonic and eustatic controls on the Oligocene evolution of the Austral (Magallanes) Basin, southernmost Argentina

Marenssi, Sergio A.; Limarino, Carlos Óscar; Tripaldi, Alfonsina; Net, Laura I

doi:10.1016/j.jsames.2005.04.008

Cited by 24 publications

(20 citation statements)

References 15 publications

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“…2), south of El Calafate city, comprises a vertical arrangement of facies passing upwards from high-energy fluvial to low-energy fluvial-coastal plain environments included in the Río Leona Formation (Marenssi et al, 2005). These are covered by marine deposits of the Centinela Formation.…”

Section: Geological Setting and Previous Age Determinationsmentioning

confidence: 99%

Correlation of marine beds based on Sr- and Ar-date determinations and faunal affinities across the Paleogene/Neogene boundary in southern Patagonia, Argentina

Parras

Griffin

Feldmann

et al. 2008

Journal of South American Earth Sciences

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Section: Geological Setting and Previous Age Determinationsmentioning

confidence: 99%

Correlation of marine beds based on Sr- and Ar-date determinations and faunal affinities across the Paleogene/Neogene boundary in southern Patagonia, Argentina

Parras

Griffin

Feldmann

et al. 2008

Journal of South American Earth Sciences

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“…An increased rate of accommodation creation is commonly attributed to one or more of the following driving mechanisms: (1) high rates of basin subsidence such as encountered in many foreland basin settings (e.g. Marenessi et al 2005); (2) base-level rise (Bristow et al 1999;Bourquin et al 2006) Most systems are governed by a combination of these factors, although one may be dominant (Ethridge et al 1998). …”

Section: Introductionmentioning

confidence: 99%

Prediction of channel connectivity and fluvial style in the flood-basin successions of the Upper Permian Rangal coal measures (Queensland)

et al. 2014

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Predicting the presence and connectivity of reservoir-quality facies in otherwise mud-prone fluvial overbank successions is important as such sandbodies can potentially provide connectivity between larger neighboring sandbodies. This interseam. Well spacing was too great to allow accurate correlation of channel bodies. The Ob River, Siberia, was used as modern analogue to supply planform geometric measurements of splay and distributary channels, so that stochastic modeling of channel bodies was possible. The resulting models demonstrated that (i) channel-body connectivity is more uniform in distributary river systems than in splay complexes; (ii) relatively good connectivity is seen in proximal positions in splays, but decreases distally from the source as channel elements diverge; (iii) connectivity tends to be greater down the axis of splays, with more isolated channel bodies occurring at the margins.

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“…The lowermost beds of the Estancia 25 de Mayo Formation overlie the Río Leona Formation. The contact is interpreted to be a marine flooding surface with the underlying deposits interpreted to be a low-energy meandering fluvial system (Marenssi et al, 2005). The upper boundary of the Estancia 25 de Mayo Formation is characterized by estuarine-coastal deposits overlain by fluvial beds of the Santa Cruz Formation (Cuitiñ o and Scasso, 2010Scasso, , 2013 fig.…”

Section: Study Area and Stratigraphic Settingmentioning

confidence: 99%

“…The uppermost beds of the underlying Río Leona Formation (not included in the facies analysis) represent fluvial paleoenvironments, within-channel conglomerate bars and carbonaceous mudstone in the floodplains (Marenssi et al, 2005). Above, FA2 of the Estancia 25 de Mayo Formation is interpreted to represent deposition on a marine shelf, marking a sudden onset of marine sedimentation in the area.…”

Section: Evolution Of the Sedimentary Systemmentioning

confidence: 99%

Insights Into the Distribution of Shallow-Marine to Estuarine Early Miocene Oysters From Southwestern Patagonia: Sedimentologic and Stable Isotope Constraints

Cuitiño¹,

Santos²,

Scasso³

2014

PALAIOS

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The lower Miocene Estancia 25 de Mayo Formation consists of shallowmarine to estuarine deposits that bear numerous oyster shell beds distributed throughout the succession. Facies analysis reveals that oysters grew in the nearshore paleoenvironments of both the lower Quién Sabe and the upper Bandurrias members. Two oyster species were identified: Crassostrea(?) hatcheri, distributed in the lower two thirds of the column, and Crassostrea orbignyi, distributed in the upper third of the column within the transition from marine to the fluvial deposits of the overlying Santa Cruz Formation. Petrographic, cathodoluminiscence, and carbon and oxygen stable isotope analyses of individual growth increments were performed on carbonate from all the oyster beds, together with consecutive time-series analyses for one specimen of each species. The isotopic composition of the shell seems to be associated with the microstructure of the growth increments. Selective diagenetic alteration affected chalky growth increments; whereas translucent (foliated and prismatic) growth increments are well preserved and can be used to infer paleoenvironmental conditions. Isotopic data indicate that C.(?) hatcheri lived in normal marine waters with a range of paleotemperatures from 10.6 to 20.5 6C. Monospecific beds of this oyster are related to opportunistic and quick colonization of the sea bottom. More negative d 13 C and d 18 O values in C. orbignyi shells likely reflect decreased paleosalinities, and the resultant environmental stress controlled the development of these low-diversity oyster accumulations. The separate stratigraphic distribution of each species was therefore determined by the paleoenvironmental conditions.

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Fluvial systems variations in the Rio Leona Formation: Tectonic and eustatic controls on the Oligocene evolution of the Austral (Magallanes) Basin, southernmost Argentina

Cited by 24 publications

References 15 publications

Correlation of marine beds based on Sr- and Ar-date determinations and faunal affinities across the Paleogene/Neogene boundary in southern Patagonia, Argentina

Correlation of marine beds based on Sr- and Ar-date determinations and faunal affinities across the Paleogene/Neogene boundary in southern Patagonia, Argentina

Prediction of channel connectivity and fluvial style in the flood-basin successions of the Upper Permian Rangal coal measures (Queensland)

Insights Into the Distribution of Shallow-Marine to Estuarine Early Miocene Oysters From Southwestern Patagonia: Sedimentologic and Stable Isotope Constraints

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