Sedimentology and palaeontology of the Upper Jurassic Puesto Almada Member (Cañadón Asfalto Formation, Fossati sub-basin), Patagonia Argentina: Palaeoenvironmental and climatic significance

Cabaleri, Nora Graciela; Benavente, Cecilia Andrea; Monferran, Mateo D.; Narváez, Paula Liliana; Volkheimer, Wolfgang; Gallego, Oscar Florencio; Campo, Margarita Diana Do

doi:10.1016/j.sedgeo.2013.08.011

Cited by 16 publications

(5 citation statements)

References 55 publications

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“…More recently, Bosence () argued that the environment in which the lower Purbeck limestones formed on the Isle of Portland varied laterally from a hypersaline to brackish and possibly freshwater lacustrine system; in this system, the conifer trees and soils indicate a seasonal, semi‐arid climate. The sedimentary features of the Puesto Almada Member (southern Argentina) are in accordance with an arid climatic scenario throughout the Late Jurassic and record strong seasonality, with periods of higher humidity represented by wetlands and lacustrine sediments (Cabaleri et al ., ).…”

Section: Discussion – Palaeogeographic Context – Climate Hydrology Amentioning

confidence: 97%

Climatic and tectonic controls on carbonate deposition in syn‐rift siliciclastic fluvial systems: A case of microbialites and associated facies in the Late Jurassic

2015

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This work provides new insights to assess the factors controlling carbonate deposition in the siliciclastic fluvial systems of rift basins. Sedimentological and stable-isotope data of microbialites and associated carbonate facies, along with regional geological information, are shown to reveal the influence of climate and tectonics on the occurrence and attributes of carbonate deposits in these settings. The Vega Formation -a 150 m thick Lower Kimmeridgian siliciclastic fluvial sequence in Asturias Province (northern Spain) -constitutes a candidate for this approach. This unit includes varied facies (stromatolites; rudstones, packstones and wackestones containing oncoids, intraclasts, charophytes and shell bioclasts; marlstones and polygenic calcareous conglomerates) that formed in a low-gradient fluvial-lacustrine system consisting of shallow, low-sinuosity oncoid-bearing channels and pools within marshy areas, with sporadic coarse alluvial deposition. The sedimentological attributes indicate common erosion by channel overflow and rapid lateral changes of subenvironments caused by water-discharge variations. The carbonate fluvial-lacustrine system developed near uplifted marine Jurassic rocks. The occurrence of the system was conditioned by normal faults (active during the deposition of the unit) that favoured: (i) springs of HCO 3 -Ca-rich water from a Rhaetian-Sinemurian carbonate rock aquifer; and (ii) carbonate deposition in areas partially isolated from the adjacent siliciclastic fluvial system. The microbialite d 13 C and d 18 O values support deposition in a hydrologically open system, fed by ambient-temperature meteoric water, with riparian vegetation. Three types of lamination in the stromatolites and oncoids reflect distinct morphological types of cyanobacterial communities. The textural pattern of lamination parallels d 13 C and d18 O changes, suggesting short-term cycles of precipitation and temperature. A moderately to strongly contrasted seasonal and/or pluriannual precipitation regime is inferred from the cyclic d 13 C pattern of the lamination and from the discontinuous and asymmetrical growth of oncoids. Thus, the isotopic and sedimentological attributes of the carbonate deposits were linked to short-term climate changes associated with semi-arid conditions, consistent with the studied climatic zone.

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Section: Discussion – Palaeogeographic Context – Climate Hydrology Amentioning

confidence: 97%

Climatic and tectonic controls on carbonate deposition in syn‐rift siliciclastic fluvial systems: A case of microbialites and associated facies in the Late Jurassic

2015

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“…In addition, the exclusive presence of Botryococcus colonies may reflect an alkaline pH, a relatively oxidizing Eh and biogenic activity. Cabaleri et al (2013) mentioned that wetter climatic periods with a relatively higher level of fluvial input are related to a decrease in alkalinity and salinity in wetland waters, whereas, in drier periods, when the water-level falls and evaporation becomes an important process, the salinity and alkalinity increase (Cabaleri and Armella 2005). Therefore, the absence of sporomorphs in these samples may be the result of selective preservation of the more resistant algal material (Bryant et al 1994) in a dry season or of reduced run-off from the hinterland (Tyson 1995).…”

Section: Discussionmentioning

confidence: 99%

Palaeoenvironments and palaeoclimate of the uppermost Cuyo Group and lowermost Lotena Group at Quebrada Álvarez, Picún Leufú Sub-basin, Patagonia, Argentina: a preliminary study based on palynology

Chalabe,

Olivera,

Martínez

et al. 2023

Palynology

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The palynological (palynostratigraphical/palynofacies) analysis of samples from the Middle Jurassic outcrop at the Quebrada Álvarez section located in the Neuquén Basin, Patagonia, Argentina, allowed us to begin to evaluate the palaeoecological significance of the recovered palynofloras and their importance in the evolution of these ecosystems, during the transition between the uppermost Cuyo Group and the lowermost Lotena Group. The Lajas Formation, characterised by the palynofacies type A, could be interpreted as a tide-modified delta front environment. The high abundance and diversity of the palynomorphs identified in the studied samples, contribute to improve the palynological knowledge of the Challacó Formation (palynofacies type B – F). Considering the palaeoecological requirements of the recognised plant families, relatively humid and warm climate conditions could be inferred during the deposition of this unit. Also, the ‘seasonally dry (winterwet)’ biome was interpreted for the first time in the Neuquén Basin. Based on selected key taxa a late Bathonian–early Callovian age is proposed for the Challacó Formation at the Quebrada Álvarez section. The palynological material recorded in this unit suggests the development of a lacustrine environment with cycles of relative contraction and expansion of the water body due to fluctuations between relatively dry and wet conditions. The dominance of phytoclasts, mainly opaque particles, and freshwater algae (Botryococcus) in the Bosque Petrificado Formation (palynofacies type G – I) could suggest the development of a freshwater to brackish lacustrine environment. Based on the dominance of the same group of palynomorphs (chlorophyte algae) in the Challacó and Bosque Petrificado formations, similar palaeoenvironmental conditions would be inferred for these units. From a lithofacies analysis point of view, the Challacó and Bosque Petrificado formations show isopic facies associations in the study locality.

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“…From the Jurassic of Patagonia, spinicaudatans were recorded in lacustrine facies (limestones, mudstones, and shales) associated with mud cracks, stromatolites, and organic matter (Cabaleri et al, 2013; Monferran et al, 2016). The Lahuincó creek locality is interpreted as an alkaline-water wetland with pyroclastic material levels represented by tuff and tuffaceous rocks (Cabaleri et al, 2010).…”

Section: Discussionmentioning

confidence: 99%

“…The Lahuincó creek locality is interpreted as an alkaline-water wetland with pyroclastic material levels represented by tuff and tuffaceous rocks (Cabaleri et al, 2010). The deposits are characterized by clay minerals as well as analcime, kaolinite, smectite, quartz, K-feldspar, plagioclase, and calcite (Cabaleri et al, 2013).…”

Section: Discussionmentioning

confidence: 99%

“…The lacustrine systems of the Cañadón Asfalto Formation exhibit an important volcano-sedimentary association and represent one of the most important Jurassic continental fossil records of South America. The unit is characterized mainly by limestones, pyroclastic deposits, and basalts (Stipanicic et al, 1968; Turner, 1983; Cabaleri et al, 2010, 2013).

Figure 1Lahuincó Creek locality: columnar section, both members of the Cañadón Asfalto Formation.…”

Section: Geologic Settingmentioning

confidence: 99%

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Chemical taphonomy and preservation modes of Jurassic spinicaudatans from Patagonia: a chemometric approach

et al. 2018

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Spinicaudatans (‘clam shrimps’) are small branchiopod crustaceans enclosed in a chitinous bivalved carapace that is often the only preserved element in the fossil record. However, few studies have analyzed the preservation of these carapaces, which have been found in continental facies from the Devonian to the present. The aim of this study was to contribute to a better understanding of the chemical preservation of fossil spinicaudatan carapaces, and it focused on spinicaudatan carapaces of the Cañadón Asfalto Formation from the Jurassic of Argentina. Semiquantitative energy-dispersive X-ray spectrometry (EDS) analysis provided elemental composition data that were interpreted using principal component analysis (PCA). The results showed a complex chemical mode of preservation for spinicaudatan carapaces. In some parts, EDS spectra of the specimens exhibit peaks of calcium, phosphorous, aluminum, and fluorine, representing the retention of original carapace material with some diagenetic recrystallization. Certain zones of the carapace show low-intensity peaks of the elements mentioned, while silicon and oxygen peaks (from the rock matrix) become the dominant spectral signals. These modes of preservation modify the interpretations and observations of the ornamentation of the carapace, which are used as taxonomic features. Our results suggest that specific diagenetic processes play a fundamental role in the preservation of spinicaudatans.

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Sedimentology and palaeontology of the Upper Jurassic Puesto Almada Member (Cañadón Asfalto Formation, Fossati sub-basin), Patagonia Argentina: Palaeoenvironmental and climatic significance

Cited by 16 publications

References 55 publications

Climatic and tectonic controls on carbonate deposition in syn‐rift siliciclastic fluvial systems: A case of microbialites and associated facies in the Late Jurassic

Climatic and tectonic controls on carbonate deposition in syn‐rift siliciclastic fluvial systems: A case of microbialites and associated facies in the Late Jurassic

Palaeoenvironments and palaeoclimate of the uppermost Cuyo Group and lowermost Lotena Group at Quebrada Álvarez, Picún Leufú Sub-basin, Patagonia, Argentina: a preliminary study based on palynology

Chemical taphonomy and preservation modes of Jurassic spinicaudatans from Patagonia: a chemometric approach

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