Detailed seismic stratigraphy of Lago Puyehue: implications for the mode and timing of glacier retreat in the Chilean Lake District

Heirman, Katrien; Batist, Marc De; Charlet, F.; Moernaut, Jasper; Chapron, Emmanuel; Brümmer, Robert; Pino, Mario; Urrutia, Roberto

doi:10.1002/jqs.1491

Cited by 22 publications

(19 citation statements)

References 52 publications

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“…The sediment infill of Puyehue Lake has been investigated prior to the 2011–2012 CC eruption, using seismic profiling [ Moernaut et al ., ; Heirman et al ., ] and sediment coring [ Bertrand et al ., , ], mostly for paleoenvironmental and paleoclimatological purposes. In addition, the lake tephra record was studied by Bertrand et al .…”

Section: Settingmentioning

confidence: 99%

Deposition of the 2011-2012 Cordón Caulle tephra (Chile, 40°S) in lake sediments: Implications for tephrochronology and volcanology

Bertrand

Daga

Bedert

et al. 2014

J. Geophys. Res. Earth Surf.

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Tephras preserved in lake sediments are commonly used to synchronize sedimentary archives of climate and environmental change and to correlate them with terrestrial environments. They also provide opportunities to reconstruct volcanic explosive activity, e.g., eruption frequency and tephra dispersal. Although sedimentary processes may affect the record of tephras in lakes, lake sediments are generally considered as one of the best archives of tephra stratigraphy. The 2011-2012 eruption of Cordón Caulle volcano (Chile, 40°S) offered an ideal opportunity to study the processes affecting tephra deposition in lakes. Although the prevailing westerlies transported the erupted pyroclastic material away from nearby Puyehue Lake, the tephra was identified within this relatively large lake with a thickness ranging from 1 to >10 cm. This is in contrast with smaller lakes, where tephra thickness was in agreement with ashfall distribution maps. Geomorphological observations and sedimentological analyses provide evidence that the tephra deposited in Puyehue Lake entirely consists of material reworked from the upper watershed, transported by rivers, and distributed by lake currents according to particle size and density. Our results have important implications for tephrochronology and volcanology. They suggest that (1) lakes do not act as passive tephra traps; (2) lakes with large watersheds record more eruptions than smaller lakes, which only register direct ashfalls, affecting conclusions regarding the recurrence of volcanic eruptions; and (3) using lakes with large watersheds for isopach mapping systematically leads to an overestimation of erupted tephra volumes. Smaller lakes with limited drainage basins are generally better suited for volcanological studies.

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Section: Settingmentioning

confidence: 99%

Deposition of the 2011-2012 Cordón Caulle tephra (Chile, 40°S) in lake sediments: Implications for tephrochronology and volcanology

Bertrand

Daga

Bedert

et al. 2014

J. Geophys. Res. Earth Surf.

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“…1). The development of the North Patagonian ice field in the Andes and piedmont glaciers down to the CCV during Quaternary glaciations resulted in the formation of numerous lakes, bays, and fjords following the last deglaciation ( [Laugénie, 1982], [Moreno et al, 2001], [Abarzua et al, 2004], [Kaiser et al, 2005], [Chapron et al, 2006], [Charlet et al, 2008], [Siani et al, 2010] and [Heirman et al, 2011]). The catchment area of Reloncavi Fjord (11,461 km 2 ) with its highest peak at Monte Tronador (3451 m asl) includes several large glacial lakes both in Chile (lakes Todos Los Santos and Tagua Tagua) and in Argentina (lakes Mascardi and Puelo).…”

Section: Reloncavi Fjordmentioning

confidence: 99%

Comparison of earthquake-triggered turbidites from the Saguenay (Eastern Canada) and Reloncavi (Chilean margin) Fjords: Implications for paleoseismicity and sedimentology

St‐Onge

Chapron

Mulsow

et al. 2012

Sedimentary Geology

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High-resolution seismic profiles along with physical and sedimentological properties of sediment cores from the Saguenay (Eastern Canada) and Reloncavi (Chile) Fjords allowed the identification of several decimeter to meter-thick turbidites. In both fjords, the turbidites were associated with large magnitude historic and prehistoric earthquakes including the 1663 AD (M > 7) earthquake in the Saguenay Fjord, and the 1960 (M 9.5), 1837 (M ~ 8) and 1575 AD major Chilean subduction earthquakes in the Reloncavi Fjord. In addition, a sand layer with exoscopic characteristics typical of a tsunami deposit was observed immediately above the turbidite associated with the 1575 AD earthquake in the Reloncavi Fjord and supports both the chronology and the large magnitude of that historic earthquake. In the Saguenay Fjord, the earthquake-triggered turbidites are sometimes underlying a hyperpycnite associated with the rapid breaching and draining of a natural dam formed by earthquake-triggered landslides. Similar hyperpycnal floods were also recorded in historical and continental geological archives for the 1960 and 1575 AD Chilean subduction earthquakes, highlighting the risk of such flood events several weeks or months after main earthquake. In both fjords, as well as in other recently recognized earthquake-triggered turbidites, the decimeter-to meter-thick normally-graded turbidites are characterized by a homogeneous, but slightly fining upward tail. Finally, this paper also emphasizes the sensitivity of fjords to record historic and prehistoric seismicity.

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“…The analysis of the Lago Acigami sedimentary succession shows a depositional history that is quite similar to the five‐fold proglacial sedimentary model proposed by Van Rensbergen et al . () and that is also recognised in other lakes (Charlet et al ., ; Heirman et al ., , ; Lebas et al ., ).…”

Section: Discussionmentioning

confidence: 99%

“…Patagonia hosts many glacial lakes, mainly distributed along the Andean Cordillera. Several studies have been carried out on the post‐glacial evolution of these lake basins mostly in northern Patagonia (Ariztegui et al ., , ; Charlet et al ., ; Heirman et al ., ). In the Tierra del Fuego region, the deglacial sedimentary records of three lakes have been studied before: Lago Fagnano (Waldmann et al ., , , ) Lago Chepelmut and Lago Yehuin (Lozano et al ., , ).…”

Section: Introductionmentioning

confidence: 99%

Post‐Last Glacial Maximum evolution of a “fjord‐type” lake based on high‐resolution seismic data: the Lago Roca/Acigami (southern Tierra del Fuego, Argentina/Chile)

Lozano

Civile

Lodolo

et al. 2019

J Quaternary Science

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Lago Roca/Acigami is a “fjord‐type” lake located in the southernmost part of South America, in the proximity of the Beagle Channel. A high‐resolution seismic survey was carried out to analyse the seismic stratigraphy of the lake and to shed some light on the post‐Last Glacial Maximum history of the area. Six seismic units were recognised, and their nature and depositional context were interpreted using seismic stratigraphy and acoustic facies analysis. A buried large ridge was identified within the glacial unit (SU1), interpreted as a frontal moraine that indicates a stabilisation phase. After retreat of the glacier from the basin, the trough was flooded by meltwater and a lake developed (SU2). The seismic facies, from bottom to top, depict a transition from ice‐contact (SU2; SU3) to ice‐distal proglacial conditions (SU4). A thick draping unit (SU5) marks a marine transgressive event and the instauration of a fjord environment in the basin. The marine transgression was a rapid event preceded by a fall in the lake level that caused an erosional unconformity. During the fjord phase the sedimentation remained controlled by meltwater discharge. Sea level fall, and subsequent disconnection from the Beagle Channel was accompanied by a progradation of the glaciofluvial deltaic sediments and the occurrence of several mass‐wasting deposits (SU6). © 2019 John Wiley & Sons, Ltd.

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Detailed seismic stratigraphy of Lago Puyehue: implications for the mode and timing of glacier retreat in the Chilean Lake District

Cited by 22 publications

References 52 publications

Deposition of the 2011-2012 Cordón Caulle tephra (Chile, 40°S) in lake sediments: Implications for tephrochronology and volcanology

Deposition of the 2011-2012 Cordón Caulle tephra (Chile, 40°S) in lake sediments: Implications for tephrochronology and volcanology

Comparison of earthquake-triggered turbidites from the Saguenay (Eastern Canada) and Reloncavi (Chilean margin) Fjords: Implications for paleoseismicity and sedimentology

Post‐Last Glacial Maximum evolution of a “fjord‐type” lake based on high‐resolution seismic data: the Lago Roca/Acigami (southern Tierra del Fuego, Argentina/Chile)

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