Sedimentology and paleoenvironments of the Las Chacritas carbonate paleolake, Cañadón Asfalto Formation (Jurassic), Patagonia, Argentina

Cabaleri, Nora Graciela; Benavente, Cecilia Andrea

doi:10.1016/j.sedgeo.2012.11.008

Cited by 24 publications

(17 citation statements)

References 62 publications

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“…The Middle Jurassic lacustrine sequence of Extra-andean central Patagonia represented by the Las Chacritas Member outcrops at the Cerro Cóndor (Silva Nieto et al, 2003;Cabaleri et al, 2010b) and Fossati (Cabaleri & Benavente, 2013) sub-basins of the Cañadón Asfalto Basin (Figures 1 A,C). The lithology of this member consists of limestones, shales, sandstones, and conglomerates intercalated with olivinic basalts, and pyroclastic deposits.…”

Section: Cañadón Asfalto Basinmentioning

confidence: 99%

“…A detailed sedimentologic study for the Las Chacritas Member in the Fossati depocenter was carried out by Cabaleri & Benavente (2013). According to the authors, a carbonate paleolake system with ramp shaped margins was associated with wetlands that were eventually affected by subaerial exposure and pedogenesis.…”

Section: Cañadón Asfalto Basinmentioning

confidence: 99%

“…The Upper Jurassic unit of the Cañadón Asfalto Basin, the Puesto Almada Member outcrops in the Cerro Cóndor and Fossati sub-basins (Silva Nieto et al, 2003;Cabaleri et al, 2010b;Cabaleri & Benavente, 2013). It is characterized by limestones (mudstones, bioturbated mudstones, wackestones, packstones, dolostones), shales, sandstones, conglomerates, tuff and tuffaceous deposits, paleosoils (nodular and pisolitic limestones), and rhythmites (limestones and thin pyroclastic laminae).…”

Section: -Proxies For the Cañadón Asfalto And Neuquén Basins Argentinamentioning

confidence: 99%

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Environmental and climatic proxies for the Cañadón Asfalto and Neuquén basins (Patagonia, Argentina): review of Middle to Upper Jurassic continental and near coastal sequences

Volkheimer

Quattrocchio

Cabaleri

et al. 2015

Rev. bras. paleontol.

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-In this review, we include several proxies (sedimentology, palynology, invertebrates) from the Cañadón Asfalto and Neuquén basins, to infer the environments and regional climatic context during the Middle to Late Jurassic of Patagonia. In central Patagonia, early in the Middle Jurassic, and associated with a magmatic arc, began the sedimentary fi lling of Jurassic continental sub-basins in the Cañadón Asfalto Basin. Lacustrine and fl uvio-deltaic sediments, bearing a continental Middle Jurassic palynobiota, correspond to the Las Chacritas Member, while the sediments and palynobiota from the Late Jurassic Puesto Almada Member (both in the Cañadón Asfalto Formation) indicate a palustrine wetland subenvironment immersed within an arid macroenvironment. Paleoinvertebrates (conchostracans and sponges) of this formation suggest wet-dry cycles in the water bodies they inhabited. The sedimentological information together with the continental and coastal palynomorph assemblages of the back arc Neuquén Basin, allowed distinguishing a complete regressive-transgressive sequence for the Middle Jurassic Lajas Formation. For the Upper Jurassic in this basin, the thick gypsum and anhydrite deposits of the evaporitic coastal Auquilco Formation correlate with extended deposits of eolian sandstones corresponding to the Botucatú paleodesert, and a saltmarsh environment is inferred from the palynofl ora. The palynologic associations from both basins indicate a regional warm climate with seasonal aridity. Climatic conditions would have been drier in the continental interior (Cañadón Asfalto Basin), with strongly seasonally distributed temperatures, and moister in the western coast of the continent (Neuquén Basin), during the marine transgressions.Key words: paleoenvironment, paleoclimate, Jurassic, Cañadón Asfalto Basin, Neuquén Basin, Argentina.RESUMO -Na presente revisão foram incluídos vários proxies (sedimentologia, palinologia, invertebrados), das bacias de Cañadón Asfalto e Neuquén, para inferir o contexto climático regional e ambiental durante o Jurássico Médio e Superior da Patagônia. Na região central da Patagônia, no início do Jurássico Médio, e associado a um arco magmático, começou o preenchimento sedimentar de sub-bacias continentais jurássicas na bacia Cañadón Asfalto. Os sedimentos fl úvio-deitaico e lacustres, tendo uma palinobiota continental do Jurássico Médio correspondente ao Membro Las Chacritas, enquanto os sedimentos e a palinobiota do Jurássico Superior do Membro Puesto Almada (ambos na Formação Cañadón Asfalto) indicam um subambiente palustre úmido imerso em um macroambiente árido. Os paleoinvertebrados (conchostráceos e esponjas) desta formação sugerem ciclos úmidos-secos nos corpos de água por eles habitados. A informação sedimentológica juntamente com 72

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Section: Cañadón Asfalto Basinmentioning

confidence: 99%

Section: Cañadón Asfalto Basinmentioning

confidence: 99%

Section: -Proxies For the Cañadón Asfalto And Neuquén Basins Argentinamentioning

confidence: 99%

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Environmental and climatic proxies for the Cañadón Asfalto and Neuquén basins (Patagonia, Argentina): review of Middle to Upper Jurassic continental and near coastal sequences

Volkheimer

Quattrocchio

Cabaleri

et al. 2015

Rev. bras. paleontol.

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“…It is, however, difficult to delineate boundaries between depositional and early diagenetic processes (Freytet and Plaziat 1982;Alonso-Zarza 2003;Alonso-Zarza and Wright 2010). Armenteros et al (1995) describe superimposed sedimentary-pedogenic associations from Miocene continental limestones in northern Spain, and another study in Argentina notes that authigenic minerals form very rapidly and may span both depositional and pedogenic regimes (Cabaleri and Benavente 2013). In the Olduvai limestones, pedogenesis is expressed through circumgranular, shrinkage, and desiccation cracking and nodular calcite cementation (Fig.…”

Section: Diagenesismentioning

confidence: 99%

Freshwater Limestone In An Arid Rift Basin: A Goldilocks Effect

Ashley¹,

Wet²,

Domı́nguez-Rodrigo³

et al. 2014

Journal of Sedimentary Research

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The Olduvai Basin (3u S), situated just west of the East African Rift System in northern Tanzania, contains a twomillion-year record of paleoclimate and paleoenvironmental change, as well as a rich archive of vertebrate paleontology (including hominins). Milankovitch precession cycles (, 20 kyr) regulate the mean annual precipitation (250-700 mm/yr), and the , 2500 mm/yr evapotranspiration results in a negative hydrologic balance. Despite persistent aridity, extensive deposits of freshwater limestone punctuate the stratigraphic record. Between 2 and 1 Ma, Lake Olduvai occupied the basin, and its sediments are a proxy for climate-driven cycles. Three limestones (1.84, 1.80, and 1.36 Ma in age), which formed within lakemargin floodplains adjacent to the lake, were studied to determine their depositional environment using field relations, sedimentary structures, fossils, petrography, and stable-isotope and major-element geochemistry. The three limestones are similar in that they contain peloidal micrite, siliciclastic detrital grains, and rhizoconcretions. Abundant faunal remains (gastropods, ostracods, Charaphytes, and fish) indicate that ponded water was relatively fresh and alkaline.Geochemical and stable-isotope data indicate two types of groundwater-sourced carbonate-producing waters: a deepersourced fluid that was enriched in iron and manganese due to extended water-rock interactions, and a shallower groundwater that traveled through alluvial-fan deposits. Regional faults tapped the deeper groundwater, producing carbonate at spring sites, while seeps associated with basinward changes in alluvial-fan slopes drew on shallower groundwater sources. Isotope compositions indicate that fault-related waters experienced some evaporation as water moved away from the spring sites while compositions of the seep-related carbonate remained relatively constant. Pedogenic alteration and meteoric calcite cementation affected the carbonate when the spring and seep sites dried out. Secondary strontium-rich dolomite precipitated within the limestones during burial under paleo-Lake Olduvai sediments and fluids during periods of lake expansion.Integrating these data within the geological context of regional paleoclimatic and local environmental change indicates that the freshwater carbonates formed periodically when the conditions were just right, i.e., a ''Goldilocks Effect.'' Carbonates near the basin center formed from groundwater flowing under a hydraulic head from faults or fractures during the falling limbs of Milankovitch cycles when the lake was in recession. Carbonates near the basin margin formed from an increased rate of groundwater seepage that occurred only on the rising limbs of cycles. In both contexts, the continuous flow of groundwater with surface evaporation and CO 2 degassing optimizes the conditions for limestone formation in this arid environment. These results help explain the formation of freshwater limestones in the rift basin, link the carbonates to specific portions of Milankovitch cycles, and document th...

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“…Continental carbonates are rich in palaeoclimatic, palaeoenvironmental and palaeontological information; they are found within all types of land‐based sedimentary systems all over the world (Alonso‐Zarza & Wright, ; Gierlowski‐Kordesch, ; Jones & Renaut, ; Gierlowski‐Kordesch et al ., ), especially in extensional basins (Alonso‐Zarza et al ., ). Reports on continental carbonate deposits in the geological record in South America are scarce and belong mainly to Jurassic and Cretaceous deposits (Bertani & Carozzi, ; Suárez & Bell, ; Rouchy et al ., ; Camoin et al ., ; Cabaleri & Armella, , ; Gómez‐Pérez, ; Tunik, ; Beraldi‐Campesi et al ., ; Cabaleri et al ., , ; Cabaleri & Benavente, ). Reports of Triassic continental carbonates, however, have been non‐existent until now.…”

Section: Introductionmentioning

confidence: 98%

Comparison of lacustrine successions and their palaeohydrological implications in two sub‐basins of the Triassic Cuyana rift, Argentina

et al. 2015

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Continental carbonates are rich in palaeoclimatic, palaeoenvironmental and palaeontological information. While carbonate accumulation mechanisms have been described for many types of continental environments, especially in extensional basins, there are still uncertainties that existing facies models fail to address. The Triassic Cerro de las Cabras and Cerro Puntudo formations are alluvial-fluvial-lacustrine sequences that represent a part of the sedimentary infill of two sub-basins of the Cuyana Basin during the early stages of the Triassic rift in west-central Argentina. Previous work has provided absolute dates, confirming that these deposits are coeval (Anisian) allowing a comparative study of carbonate sedimentation in an extensional tectonic context. The description and origin of freshwater carbonate deposits and their surrounding siliciclastic sediments in specific areas of the Cuyana rift, gives insight into the major factors that control carbonate precipitation in all rift basins, including the characterization of the palaeohydrology and the importance of provenance. The Cerro de las Cabras Formation represents an ephemeral, playa-lake depositional system with subaerial exposure and pedogenesis. Its aggradational succession corresponds to the evaporative facies association lake type, diagnostic of underfilled lake basins where persistently closed surface hydrology can lead to thick evaporites. However, this formation lacks thick evaporites and has microbialitic limestones, pointing to an open groundwater supply. The Cerro Puntudo Formation represents an alkaline playa-lake system fed by groundwater and ephemeral surface-water input. The unit is an aggradational-minor progradational succession, pointing to a fluctuating profundal facies association, suggesting a balanced-filled lake type. These two synchronous, lacustrine depositional systems were influenced by tectonics and climate. Provenance and hydrology are key controls in carbonate accumulation in continental rift basins that must be included in future facies models for continental carbonates. Comparison with other rift basins suggests that application of lake-type characterizations coupled with palaeohydrology and provenance patterns will aid in developing new sedimentation models for freshwater limestones in extensional settings.

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Sedimentology and paleoenvironments of the Las Chacritas carbonate paleolake, Cañadón Asfalto Formation (Jurassic), Patagonia, Argentina

Cited by 24 publications

References 62 publications

Environmental and climatic proxies for the Cañadón Asfalto and Neuquén basins (Patagonia, Argentina): review of Middle to Upper Jurassic continental and near coastal sequences

Environmental and climatic proxies for the Cañadón Asfalto and Neuquén basins (Patagonia, Argentina): review of Middle to Upper Jurassic continental and near coastal sequences

Freshwater Limestone In An Arid Rift Basin: A Goldilocks Effect

Comparison of lacustrine successions and their palaeohydrological implications in two sub‐basins of the Triassic Cuyana rift, Argentina

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