Paleohydrogeologic reconstruction of Triassic carbonate paleolakes from stable isotopes: Encompassing two lacustrine models

Benavente, Cecilia Andrea; Mancuso, Adriana Cecilia; Bohacs, Kevin M.

doi:10.1016/j.jsames.2019.102292

Cited by 23 publications

(19 citation statements)

References 52 publications

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“…The analyzed succession includes abundant sedimentological features such as mud‐cracks, mud‐chips and rain‐drop imprints that indicate subaerial exposure, thus, suggesting that the surface water+sediment supply was ephemeral (Gierlowski‐Kordesch & Rust, ; Gierlowski‐Kordesch, ). The stacking pattern observed in the sections is mainly aggradational, a characteristic of an underfilled lake‐basin (Bohacs et al ., ; Benavente et al ., ). The sandflat facies association (documented mainly in the sections of the Vallet south and Vallet north quarries, see Fig.…”

Section: Discussionmentioning

confidence: 97%

“…Balanced‐fill lakes are intermittently open lakes characterized by a mixture of siliciclastic and biogenic‐chemical deposits, dominated by an alternation of progradational and aggradational stacking of facies associations related to a fluctuating lake level and groundwater table. Underfilled lakes are usually linked to closed hydrography (Bohacs et al ., , and references therein) although, in most cases, they have open groundwater systems (Benavente et al ., ,b; Benavente et al ., ). This lake‐basin type is characterized by aggradational stratal stacking patterns (with potential contribution of evaporitic deposits) and the development of extensive dry, desiccated mudflats related to a frequently low groundwater table.…”

Section: Introductionmentioning

confidence: 97%

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An integrative physical, mineralogical and ichnological approach to characterize underfilled lake‐basins

et al. 2020

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Lakes are particularly sensitive to environmental fluctuations, which are recorded in their facies and stratigraphy. Ephemeral lakes reveal their sensitivity to palaeoenvironmental changes in the overprinting of the sedimentary features in every single bed. Tetrapod‐track taphonomic‐modes and ichnological taphonomic‐pathways can be used as sensitive indicators of environmental conditions of the track‐bearing beds during deposition and imprinting. The Middle Triassic Cerro de las Cabras succession (Cuyana Basin, Argentina) provides an excellent opportunity to these environmental indicators in an underfilled palaeolake. A model of ichnological preservation for underfilled lake systems is proposed and the role of the ichnology record in the sequence stratigraphy analysis is evaluated, based on the integration of tetrapod‐track modes, taphonomic‐pathways of playa‐lake ichnofauna, mineralogy and physical data. Soft‐ground suites include those dominated by invertebrate grazing traces and arthropod locomotion traces (Suite 1), and those overprinted by horizontal‐vertical dwelling burrows with tetrapod tracks preserved in taphonomic modes B and C (Suite 2). The firm‐ground suite (Suite 3) comprises tetrapod‐tracks with the best preservation styles (modes A and B) along less abundant invertebrate dwelling and feeding traces as found in Suite 2. Clay mineralogy (dominated by illite with subordinate smectite) suggests low plasticity of the layers, in agreement with low‐relief deformation structures observed in tetrapod‐track taphonomic‐modes. The well‐preserved track tetrapod features documented in the Cerro de las Cabras succession, together with the absence of pedogenic disturbance, trampling obliterating the footprints, and/or evidence of strong disturbance by wind, desiccation and/or precipitation, supports short periods of exposure of the imprinted surface particular to this succession. An integrated multiproxy approach is proposed to evaluate the evolutionary interpretation and identification of autogenic versus allogenic controls in underfilled lake‐basin histories. The observed aggradational‐trend suggests an equilibrium between rates of accommodation change and sediment supply, and that the basin‐centre did not experience prolonged sediment‐starved conditions.

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Section: Discussionmentioning

confidence: 97%

Section: Introductionmentioning

confidence: 97%

An integrative physical, mineralogical and ichnological approach to characterize underfilled lake‐basins

et al. 2020

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“…Talbot, 1990; Li & Ku, 1997; Utrilla et al ., 1998; Arp et al ., 2017a,b), nor to hydrologically open lakes, which are characterized by cloud‐like δ 13 C–δ 18 O patterns (e.g. Last et al ., 1994; Utrilla et al ., 1998; Hammarlund et al ., 2003; Benavente et al ., 2019) (Fig. 7B).…”

Section: Interpretation and Discussionmentioning

confidence: 94%

Sedimentological and carbonate isotope signatures to identify fluvial processes and catchment changes in a supposed impact ejecta‐dammed lake (Miocene, Germany)

Zeng

Ruge

Berger³

et al. 2021

Sedimentology

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The identification and distinction of fluvial from lacustrine deposits and the recognition of catchment changes are crucial for the reconstruction of climate changes in terrestrial environments. The investigated drill core succession shows a general evolution from red-brown claystones to white-grey marlstones and microcrystalline limestones, which all have previously been considered as relict deposits of an impact ejecta-dammed lake, falling within the mid-Miocene Climate Transition. However, recent mammal biostratigraphic dating suggests a likely pre-impact age. Indeed, no pebbles from impact ejecta have been detected; only local clasts of Mesozoic formations, in addition to rare Palaeozoic lydites from outside of the study area. Lithofacies analysis demonstrates only the absence of lacustrine criteria, except for one charophyte-bearing mudstone. Instead, the succession is characterized by less diagnostic floodplain fines with palaeosols, palustrine limestones with root voids and intercalated thin sandstone beds. Carbonate isotope signatures of the mottled marlstones, palustrine limestones and mud-supported conglomerates substantiate the interpretation of a fluvial setting. Low, invariant d 18 O carb reflects a short water residence time and highly variable d 13 C carb indicates a variable degree of pedogenesis. Carbonate 87 Sr/ 86 Sr ratios of the entire succession show a unidirectional trend from 0.7103 to 0.7112, indicating a change of the solute provenance from Triassic to Jurassic rocks, identical to the provenance trend from extraclasts. The increase in carbonate along the succession is therefore independent from climate changes but reflects a base-level rise from the level of the siliciclastic Upper Triassic to the carbonate-bearing Lower to Middle Jurassic bedrocks. This study demonstrates that, when information on sedimentary architecture is limited, a combination of facies criteria (i.e. presence or absence of specific sedimentary structures and diagnostic organisms), component provenance, and stable and radiogenic isotopes is required to unequivocally distinguish between lacustrine and fluvial sediments, and to disentangle regional geological effects in the catchment and climate influences.

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“…These deposits have been interpreted as sheetfloods in a sandflat and mudflat and gradually transitioning to a carbonate-rich playa lake system (Benavente et al, 2015). The playa lake has been classified as a balanced-fill through flow lake (Benavente et al, 2019). The unit has been U-Pb zircon dated in the lower half section 249.1 ± 9.1 Ma (LA-ICP-MS, Teixeira et al, 2018) and near its top as 243.4 ± 4.0 Ma (SIMS, Mancuso et al, 2010) constraining its deposition to late Early-Middle Triassic (see Irmis et al, this volume for further discussion).…”

Section: Cerro Puntudo Sub-basinmentioning

confidence: 99%

“…These deposits have been interpreted as sheetfloods and ephemeral fluvial system development (Bellosi et al, 2001;Kokogian et al, 2001). The middle section of the unit is dominated by carbonates interbedded with red mudstones and rarer tuffs that have been interpreted as a sandflat and mudflat subenvironments with development of a carbonate-rich playa lake (Benavente et al, 2015), classified as an underfilled recharge lake (Benavente et al, 2019). Previous biostratigraphic studies suggested a range of ages, with palynomorphs indicating a Middle Triassic age (upper Ansian-Ladinian) (Zavattieri 1990a(Zavattieri , 1990b(Zavattieri , 1990c(Zavattieri , 1991a(Zavattieri , 1991bZavattieri and Batten 1996) and vertebrates implying an Early Triassic age (Bonaparte 2000;Zavattieri and Arcucci 2007).…”

Section: Rincónmentioning

confidence: 99%

The paleoclimatic context for South American Triassic vertebrate evolution

Mancuso

Horn

Benavente

et al. 2021

Journal of South American Earth Sciences

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Paleohydrogeologic reconstruction of Triassic carbonate paleolakes from stable isotopes: Encompassing two lacustrine models

Cited by 23 publications

References 52 publications

An integrative physical, mineralogical and ichnological approach to characterize underfilled lake‐basins

An integrative physical, mineralogical and ichnological approach to characterize underfilled lake‐basins

Sedimentological and carbonate isotope signatures to identify fluvial processes and catchment changes in a supposed impact ejecta‐dammed lake (Miocene, Germany)

The paleoclimatic context for South American Triassic vertebrate evolution

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