Maximum glacier extent of the Penultimate Glacial Cycle in the Upper Garonne Basin (Pyrenees): new chronological evidence

Fernandes, Marcelo; Oliva, Marc; Vieira, Gonçalo; Palacios, David; Fernández‐Fernández, José M.; Delmas, Magali; García‐Oteyza, Julia; Schimmelpfennig, Irene; Ventura, Josep L.; Aumaître, Georges; Keddadouche, Karim; Team, Aster

doi:10.1007/s12665-021-10022-z

Cited by 9 publications

(11 citation statements)

References 79 publications

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“…Very few dates were also found by Lewis et al (2009) From the northern slope of the Pyrenees, we highlight the Garonne (Fig. 1) terminal complex of La Serre (Fernandes et al, 2017), where an end-MIS 6 age from the WMHP-5 were reported by Fernandes et al (2021) for the outermost end moraine (MIE; Fig. 17b), and later glacial advances built a Figure 16.…”

Section: Discussionmentioning

confidence: 85%

“…The archaeological site of Tambourets is only a few kilometres beyond Barbazan (Fig. 1), where a close-nested end moraine from the Garonne glacier is located (Andrieu et al, 1988; Fernandes et al, 2021). Bricker (2014) described archaeological remains within loess-type deposits from the beginning of Heinrich Event 4 (GS-10; Rasmussen et al, 2014).…”

Section: Discussionmentioning

confidence: 99%

“…However, evidence of old glaciations in Iberia is sparse (Turu and Peña-Monné, 2006; Lewis et al, 2009; Jalut et al, 2010; García-Ruiz et al, 2013; Villa et al, 2013; Delmas et al, 2021a). Nevertheless, the penultimate glaciation (MIS 6) has been identified in most of the Iberian ranges (Vidal-Romaní et al, 1999, 2015; Turu and Peña-Monné, 2006; García-Ruiz et al, 2013; Rodríguez-Rodríguez et al, 2016; Vieira et al, 2021; Fernandes et al, 2021) and coincided with a significant episode of fluvial aggradation (Turu and Peña-Monné, 2006; Lewis et al, 2009; Stange et al, 2013, 2014; Delmas et al, 2015).…”

Section: Introductionmentioning

confidence: 99%

“…However, insolation slightly diminished until interstadial GI-7 (≈35 ka) is more pronounced, declining until stadial GS-3 (≈27 ka), corresponding with a phase of significant glacial readvances in the Pyrenees (Turu, 2018). To gain a better understanding of the palaeoenvironmental conditions of the LGC, causes of the LMIE/LGM dephasing and the chronological position of the MIE, some authors have investigated relevant glaciolacustrine sequences in the Pyrenees (Jalut et al, 1992(Jalut et al, , 2010González-Sampériz et al, 2006;Turu and Bordonau, 2013;Turu et al, 2017;Sancho et al, 2018), sediments from glacially overdeepened valleys (Bordonau, 1992;Turu, 2000;Turu et al, 2007;Salazar-Rincón et al, 2013), lacustrine foreland sequences (Pérez-Obiol and Julià, 1994;Höbig et al, 2012;González-Sampériz et al, 2017), or fluvial terraces (Peña-Monné et al, 2011;Stange et al, 2014;Delmas et al, 2015) or have focused on lateral glacial (kame-type deposits) and terminal complexes (end moraines and glaciofluvial deposits) (Turu and Peña-Monné, 2006;Lewis et al, 2009Lewis et al, , 2017Pallàs et al, 2010;Delmas et al, 2011;Bartolomé et al, 2021;Fernandes et al, 2021;among others).…”

Section: Introductionmentioning

confidence: 99%

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Glacial–interglacial cycles in the south-central and southeastern Pyrenees since ~180 ka (NE Spain–Andorra–S France)

et al. 2023

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This study uses luminescence and 14C accelerator mass spectrometry procedures to date relevant glaciofluvial and glacial deposits from the south-central and southeastern Pyrenees (Andorra–France–Spain). We distinguish two types of end-moraine complexes: (1) those in which at least a far-flung moraine exists beyond a frequently nested end-moraine complex (the most common) and (2) those in which a close-nested end moraine encompasses at least two glacial cycles. Both types formed within six distinctive glacial intervals: (1) A penultimate glacial cycle during Marine Oxygen Isotope Stage (MIS) 6 and older glaciofluvial terraces occurred beyond the range of the luminescence dating method. (2) An early glacial advance in MIS 5d (~97 −15/+19 ka) was followed by glacial retreat during MIS 5c (< 91 ± 9 ka). (3) The last maximum ice extent (LMIE) was in early MIS 4 (~74 ± 4.5 ka). (4) Unexpectedly, glaciers thinned during the second half of MIS 3 (~39 −6/+11 ka). (5) During the MIS 3–2 transition, glaciers subsequently fluctuated behind the LMIE limits. (6) The global last glacial maximum (LGM) started as early as ~26.6 ± 0.365 ka b2k, and the corresponding end moraines were built behind the LMIE limits or merged with it, forming close-nested moraines.

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Section: Discussionmentioning

confidence: 85%

Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Glacial–interglacial cycles in the south-central and southeastern Pyrenees since ~180 ka (NE Spain–Andorra–S France)

et al. 2023

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“…More generally, MIS 6 glacial deposits are ubiquitous near former glacial margins and are documented by a wider body of evidence than other pre-LGC glaciations (e.g. Putnam et al, 2013;Kiernan et al, 2014;Evans et al, 2019;Fernandes et al, 2021), suggesting that the greatest global ice volume of the middle Pleistocene was likely reached during that interval (Hughes et al, 2020). In Patagonia, however, our chronology is amongst the first published datasets, along with one other ongoing investigation (abstract: Peltier et al, 2017), offering direct and robust dating of a MIS 6 glacial expansion event.…”

Section: The Penultimate Mis 6 Glaciationmentioning

confidence: 99%

A cosmogenic nuclide-derived chronology of pre-Last Glacial Cycle glaciations during MIS 8 and MIS 6 in northern Patagonia

Leger

Hein

Rodés

et al. 2022

Preprint

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Abstract. The precise environmental mechanisms controlling Quaternary glacial cycles remain ambiguous. To address this problem, it is critical to better comprehend the drivers of spatio-temporal variability in ice-sheet evolution by establishing reliable chronologies of former outlet-glacier advances. When spanning multiple glacial cycles, such chronologies have the capacity to resolve conundrums on interhemispheric phasing of glaciations and climate events. In southern Argentina, reconstructions of this kind are achievable, as Quaternary expansions of the Patagonian Ice Sheet have emplaced a well-preserved geomorphological record covering several glacial cycles. Moreover, robust ice-sheet reconstructions from Patagonia are powerful barometers of former climate change, as Patagonian glaciers are influenced by the Southern Westerly Winds and its coupled Antarctic Circumpolar Current. Former shifts in these circulation mechanisms are essential to better constrain, as they may have played a critical role in pacing regional and possibly global Quaternary climate change. Here, we present a new set of cosmogenic 10Be and 26Al exposure ages from pre-Last Glacial Cycle moraine boulder, glaciofluvial outwash cobble and bedrock samples. This dataset constitutes the first direct chronology dating pre-LGM glacier advances in northern Patagonia, and completes our effort to date the entire preserved moraine record of the Río Corcovado valley system (43° S, 71° W). We find the outermost margins of the study site depict at least three distinct pre-Last Glacial Cycle glaciations occurring at 284 ± 7 ka, 257 ± 7 ka, and 147 ± 4 ka. Combined with the local LGM chronology, we discover that a minimum of four distinct Pleistocene glaciations occurred during Marine Isotope Stages eight, six, and two in northern Patagonia. Evidence for stage four and three deposits were not found at the study site, which illustrates former longitudinal and latitudinal asynchronies in Patagonian Ice Sheet mass balance during these stages. We find the most extensive middle-to-late Pleistocene expansions of the Patagonian Ice Sheet appear to be out-of-phase with local summer insolation intensity, but synchronous with orbitally-controlled periods of longer and colder winters. Our findings thus enable to explore the potential roles of seasonality and seasonal duration in driving southern mid-latitude ice-sheet mass balance and facilitate novel glacio-geomorphological interpretations for the study region. They also provide empirical constraints of former ice-sheet extent and dynamics that are essential to calibrating numerical ice-sheet and glacial isostatic adjustment models.

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On dialogue about earth processes and sustainable environment in a changing world: a tribute to the legacy of the landscape traveller Augusto Pérez-Alberti

Gomes,

García,

Gómez-Pazo

et al. 2024

Environ Earth Sci

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Maximum glacier extent of the Penultimate Glacial Cycle in the Upper Garonne Basin (Pyrenees): new chronological evidence

Cited by 9 publications

References 79 publications

Glacial–interglacial cycles in the south-central and southeastern Pyrenees since ~180 ka (NE Spain–Andorra–S France)

Glacial–interglacial cycles in the south-central and southeastern Pyrenees since ~180 ka (NE Spain–Andorra–S France)

A cosmogenic nuclide-derived chronology of pre-Last Glacial Cycle glaciations during MIS 8 and MIS 6 in northern Patagonia

On dialogue about earth processes and sustainable environment in a changing world: a tribute to the legacy of the landscape traveller Augusto Pérez-Alberti

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