The exploration of marginal spaces in Central-West Patagonia and the role of discontinuous occupation of forests and highlands

Méndez, César; Delaunay, A; Reyes, Omar

doi:10.1016/j.anthro.2023.103118

Cited by 4 publications

(3 citation statements)

References 53 publications

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“…Although human presence east of the North Patagonian Icefield became regular at around 3000 cal yr BP, dated archeological sites along the southeastern border of Meseta Chile Chico point to human occupation between 500 and 1560 cal yr BP . However, preliminary archeological surveys across the plateau revealed small surface concentrations of lithic material, indicating the procurement of tool stones and signalling minor evidence of anthropogenic influence on Meseta Chile Chico during the Holocene (Méndez et al, 2023). Therefore, we assume that the younger section of LME-CP (Stage 4) also reflects mainly natural Holocene environmental variability and not human impact.…”

Section: Holocene Paleoenvironmental Evolution Of the Meseta Chile Chicomentioning

confidence: 89%

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Holocene environmental and climate evolution of central west Patagonia as reconstructed from lacustrine sediments of Meseta Chile Chico (46.5° S, Chile)

Franco,

Maldonado,

Ohlendorf

et al. 2024

Clim. Past

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Abstract. Holocene environmental changes in Patagonia were mostly shaped by fluctuating ice cover recession. Consequently, environmental reconstructions are largely based on discontinuous moraine chronologies from valley deposits. Here, we present a 3 m long continuous sediment record recovered from Laguna Meseta (LME), a lake located on Meseta Chile Chico. Its altitude and location relative to the North Patagonian Icefield provide a unique opportunity to reconstruct the glacial history and related environmental dynamics. Our radiocarbon chronology constrains sedimentation to the last ∼10 000 years and provides a minimum age for postglacial ice-free lacustrine conditions, due to a westward retreat of the ice cap. Lacustrine productivity reached its maximum at the start of the lake phase and decreased afterwards. Between 5500 and 4600 cal yr BP, a major shift towards allochthonous sediment accumulation occurred, caused by an abrupt increase in clastic deposition from basaltic lithologies of the Meseta Chile Chico. This episode correlates with the precipitation-driven Mid-Holocene glacier advance of Patagonian glaciers and suggests that conditions were colder and/or wetter on Meseta Chile Chico at that time. After 4600 cal yr BP, these conditions continued to supply LME with clastic sediments until a stepped decrease around 900 cal yr BP. Thereupon, lacustrine productivity distinctly increased and stabilized around 300 cal yr BP. Our findings indicate that changes in sedimentation on Meseta Chile Chico were mainly controlled by regional variability in the precipitation. Furthermore, strong correlation between our records and available proxies for oscillations of the Southern Hemisphere Westerly Winds suggest a pronounced climatic control by this prominent wind system for central west Patagonia during the last 10 000 years.

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Section: Holocene Paleoenvironmental Evolution Of the Meseta Chile Chicomentioning

confidence: 89%

“…Due to its altitude and morphology, the environment of Meseta Chile Chico is less influenced by local factors such as surrounding topography, vegetation, and human intervention (Méndez et al, 2023) compared to the surrounding glacial valleys. Additionally, this plateau is covered with several small lakes (Fig.…”

Section: Geomorphology and Modern Settingmentioning

confidence: 99%

Holocene environmental and climate evolution of central west Patagonia as reconstructed from lacustrine sediments of Meseta Chile Chico (46.5° S, Chile)

Franco,

Maldonado,

Ohlendorf

et al. 2024

Clim. Past

Self Cite

View full text Add to dashboard Cite

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“…Although human presence east of the North Patagonian Icefield became regular at 3,000 cal yr BP, dated archaeological sites along the SE border of Meseta Chile Chico point to human occupancy between 500 and 1,560 cal yr BP (Nuevo-Delaunay et 560 al., 2022). However, preliminary archaeological surveys across the plateau revealed small surface concentrations of lithic material indicating the procurement of toolstones, signalling a minimal evidence of anthropogenic influence on Meseta Chile Chico during the Holocene (Méndez et al 2023). Therefore, we assume that also the younger section of LME-CP (Stage 4) reflects mainly natural Holocene environmental variability.…”

Section: Holocene Paleoenvironmental Evolution Of the Meseta Chile Ch...mentioning

confidence: 89%

Holocene environmental and climate evolution of Central West Patagonia as reconstructed from lacustrine sediments of Meseta Chile Chico (46.5º S, Chile)

Franco,

Maldonado,

Ohlendorf

et al. 2023

Preprint

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Abstract. Holocene environmental changes in Patagonia were mostly shaped by unsteady ice-cover recession. Consequently, environmental reconstructions are largely based on discontinuous moraine chronologies from valley deposits. Here, we present a 3 m-long continuous sediment record recovered from Laguna Meseta (LME), a lake located on Meseta Chile Chico. Its altitude and location relative to the North Patagonian Icefield provide a unique opportunity to reconstruct the glacial history and the related environmental dynamics. Our radiocarbon chronology constrains sedimentation to the last ~10,000 years and provides a minimum age for postglacial ice-free lacustrine conditions due to a westward retreat of the ice cap. Lacustrine productivity reached its maximum at the start of sedimentation and decreased afterwards. Between 5,500 and 4,600 cal yr BP, a major shift towards allochthonous sediment accumulation occurred, caused by an abrupt increase in clastic deposition from basaltic lithologies of the Meseta Chile Chico. This episode correlates with the precipitation-driven mid-Holocene glacier advance of Patagonian glaciers and suggests that conditions were colder/wetter on the Meseta Chile Chico at that time. After 4,600 cal yr BP these conditions continued to supply LME with clastic sediments until a stepped decrease around 900 cal yr BP. Thereupon, lacustrine productivity distinctly increased and stabilized around 300 cal yr BP. Our findings indicate that environmental conditions on Meseta Chile Chico were mainly controlled by precipitation variability during regional oscillations of the Southern Hemisphere Westerly Winds over the last 10 ka.

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Postglacial landscape dynamics and fire regimes in west Central Patagonia, Chile (44°S, 72°W): Evidence from the Cisnes River Basin

Álvarez-Barra,

Maldonado,

Eugenia de Porras

et al. 2024

Quaternary Science Reviews

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The exploration of marginal spaces in Central-West Patagonia and the role of discontinuous occupation of forests and highlands

Cited by 4 publications

References 53 publications

Holocene environmental and climate evolution of central west Patagonia as reconstructed from lacustrine sediments of Meseta Chile Chico (46.5° S, Chile)

Holocene environmental and climate evolution of central west Patagonia as reconstructed from lacustrine sediments of Meseta Chile Chico (46.5° S, Chile)

Holocene environmental and climate evolution of Central West Patagonia as reconstructed from lacustrine sediments of Meseta Chile Chico (46.5º S, Chile)

Postglacial landscape dynamics and fire regimes in west Central Patagonia, Chile (44°S, 72°W): Evidence from the Cisnes River Basin

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