Eolian depositional phases during the past 50 ka and inferred climate variability for the Pampean Sand Sea, western Pampas, Argentina

Tripaldi, Alfonsina; Forman, Steven L.

doi:10.1016/j.quascirev.2016.03.007

Cited by 25 publications

(22 citation statements)

References 91 publications

(160 reference statements)

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“…Glaciers advanced between ~26-20 ka contemporaneous with lake level highstands recorded in the Uyuni (Baker et al, 2001) and Poopo Basin (paleolake Sajsi 24-20.5 ka, Placzek et al, 2006Placzek et al, , 2011 in response to increased precipitation by an intensified SASM. Humid conditions were also reported for this period off shore Chile, 33°S (Lamy, 1999), in Laguna Tagua Tagua (Chile, 34°30´S, Valero Garcés et al, 2005) and in eolian sequences in Argentina (34°S, Tripaldi and Forman, 2016). Maximum austral summer insolation at 30°S (Berger and Loutre, 1991) favoured a southward position of the ITCZ and was conducive for an intensification of the SASM and the upper tropospheric easterlies, so that a combination of globally lower temperatures and insolation minima and more humid conditions seem to have been responsible for glacial advances during the gLGM between 22° and 39°S.…”

Section: Discussionsupporting

confidence: 67%

Timing and extent of late pleistocene glaciation in the arid Central Andes of Argentina and Chile (22°-41°S)

Zech¹,

Terrizzano²,

Veit³

et al. 2017

CIG

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Section: Discussionsupporting

confidence: 67%

Timing and extent of late pleistocene glaciation in the arid Central Andes of Argentina and Chile (22°-41°S)

Zech¹,

Terrizzano²,

Veit³

et al. 2017

CIG

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“…Eolian deposition spans most of the Holocene to ca. 400 years ago, associated with an inferred mean annual precipitation of 100-450 mm and drier conditions compared to the late 20th century (Tripaldi and Forman, 2016). Holocene eolian events along the Andean foreland are well constrained with OSL geochronology and have occurred over 4.3-4, 2.1, and 0.6-0.4 ka ( Figure 8A; Tripaldi and Forman, 2007).…”

Section: Aridification Drives Orogen Parallel Eolian Activitymentioning

confidence: 98%

“…expressed as a decrease in fluvial sedimentation and erosion rates, without preservation of eolian strata (Amidon et al, 2017;Stevens Goddard and Carrapa, 2018). Preserved Oligocene-Miocene eolian strata along the southern Central Andes (Tripaldi and Limarino, 2005;Levina et al, 2014;Fosdick et al, 2017) suggest a protracted history of fluctuating arid conditions in this region throughout the Cenozoic. Moreover, a thorough understanding of processes operating in eolian systems is important for predicting how these regions will continue to evolve as anthropogenic warming and increased agricultural development continues to shape the Earth's landscape, resource management, and human land use (Munson et al, 2011;Sickmann et al, 2019).…”

Section: Aridification Drives Orogen Parallel Eolian Activitymentioning

confidence: 98%

“…Precipitation in western Argentina is associated with monsoon-type circulation that is generated by humid air masses from the Atlantic anticyclone, and is concentrated (>70%) during October to March. Precipitation decreases from east to west; from 90 to 100 cm/year in the northeastern Pampas to <25-30 cm/year in the Andean piedmont study area (Compagnucci et al, 2002;Tripaldi and Forman, 2016). Regionally, wind conditions are controlled by the subtropical high-pressure cells (Pacific and Atlantic anticyclones), which modulates the Westerlies and Polar advection wind activity.…”

Section: Holocene Andean Foreland Eolian Dune Fieldsmentioning

confidence: 99%

“…The central foreland basin is dominated by a >10,000 km 2 north-trending zone of eolian landforms, including the southern Medanos Telteca and northern Medanos Grande eolian dune fields ( Figure 2B). Both Medanos Telteca and Grande systems have been estimated to be last active during the Holocene, exhibiting high-relief (50 m) parallel ridges of dominantly longitudinal (seif) dunes and asymmetric transverse dunes, and litharenite to feldspathic litharenite sand composition (Iriondo, 1999;Zárate, 2003;Zárate and Tripaldi, 2012;Tripaldi et al, 2013;Tripaldi and Forman, 2016;Tripaldi and Zárate, 2016). Detailed optically stimulated luminescence (OSL) geochronology has been established across the major eolian provinces of central Argentina, providing a framework to analyze sediment transport across the sediment routing system during the Holocene Forman, 2007, 2016;Latrubesse and Ramonell, 2010).…”

Section: Holocene Andean Foreland Eolian Dune Fieldsmentioning

confidence: 99%

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Fluvial and Eolian Sediment Mixing During Changing Climate Conditions Recorded in Holocene Andean Foreland Deposits From Argentina (31–33°S)

et al. 2019

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Continental drainage systems archive complex records of rock uplift, source area relief, precipitation, glaciation, and carbon cyclicity driven largely by tectonics and climate. Significant progress has been made in linking such external environmental forcings to the geomorphic expression of landscapes and the stratigraphic record of depositional basins in coastal and offshore areas. However, there are large uncertainties in the degree to which sediment dispersal processes can modify signals between the erosional sources and the depositional sinks. We investigate a Holocene sediment transfer zone with contrasting fluvial and eolian sediment transport mechanisms to understand how river and wind processes impact the propagation of environmental signals in continentalscale drainage systems. To quantify these processes, we employ sediment fingerprinting methods for unconsolidated sand samples (detrital zircon U-Pb geochronology), incorporate sediment mixing models, and correlate the findings with the regional geologic and geomorphic framework. Three contrasting source regions deliver sediment to the Andean foreland: volcanic rocks of the Frontal Cordillera, sedimentary rocks of the Precordillera, and metamorphic basement of the Sierras Pampeanas. Although all samples of Holocene eolian dunes accurately record sediment input from three fluvial source regions, spatial variations in U-Pb results are consistent with north-directed paleowinds, whereby river sediments from Frontal Cordillera sources are transported northward and progressively mixed with river sediments from Precordillera and Sierras Pampeanas sources. In contrast, samples of modern rivers show progressive southward (downstream) mixing along a large axial fluvial system. Sediment mixing induced by eolian transport and reworking of various sources is likely a critical, climate-modulated process in the propagation of environmental signals, potentially involving the aliasing of tectonic signals, local storage and recycling of synorogenic river sediment, and cyclical patterns of sediment starvation and delivery to distal zones of accumulation.

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Formation Processes and Environments in the Hinojo‐Las Tunas Shallow Lake System, Argentina Pampas: The Laguna Chica Archaeological Locality as a Case Study

Scheifler,

Ozán,

Tripaldi

et al. 2024

Geoarchaeology

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This work integrates taphonomic (archaeofaunistics and bioarchaeology) and geoarchaeological (geormorphology, pedologic, sedimentological and micromorphological analyses) information to discuss the depositional and postdepositional history of both surface and buried archaeological record related to past hunter–gatherer populations from the Central Pampean Dunefields of Argentina (South America). Radiocarbon and optically stimulated luminescence dating suggest three temporal clusters of occupations in the Laguna Chica locality: one during the middle Holocene (~8050–6535 years cal. B.P.) and two in the late Holocene (~3350–2870 and ~1640–1535 years cal. B.P.). Middle Holocene burials found at the present lake shore are hosted in aeolian sediments that accumulated under arid/semiarid conditions. Modern lacustrine dynamics derived from contraction/expansion cycles have exposed burials, archaeofauna, and stone tools, resulting in displacements, fragmentation and loss. A palimpsest of cultural and natural material spanning ~8000 years resulted from this paleoenvironmental setting. Late Holocene human activities might have been related to a transitional landscape, where aeolian processes took place under an expanding lacustrine scenario (i.e., relatively wetter conditions). Our stratigraphic assessment suggests that human occupations were syndepositional agents with episodes of aeolian sand activity and landscape stability. The taphonomic and geoarchaeological evidence from Laguna Chica locality show that the empirical evidence traditionally used to evaluate hunter–gatherer settlement patterns (e.g., abundance and diversity of archaeological evidence and their spatial association in surface or stratigraphic units) and human diet breadth changes (e.g., Ntaxa) may simply reflect the cumulative action of lacustrine erosion of dunes. While both the Laguna Chica surface and stratigraphic records have complex formation histories, the buried context could be interpreted with greater detail through taphonomic and sedimentological analyses.

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Eolian depositional phases during the past 50 ka and inferred climate variability for the Pampean Sand Sea, western Pampas, Argentina

Cited by 25 publications

References 91 publications

Timing and extent of late pleistocene glaciation in the arid Central Andes of Argentina and Chile (22°-41°S)

Timing and extent of late pleistocene glaciation in the arid Central Andes of Argentina and Chile (22°-41°S)

Fluvial and Eolian Sediment Mixing During Changing Climate Conditions Recorded in Holocene Andean Foreland Deposits From Argentina (31–33°S)

Formation Processes and Environments in the Hinojo‐Las Tunas Shallow Lake System, Argentina Pampas: The Laguna Chica Archaeological Locality as a Case Study

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