Multiproxy record of Holocene paleoenvironmental change, Tierra del Fuego, Argentina

Borromei, Ana María; Coronato, Andrea; Franzén, Lars G.; Ponce, Juan Federico; Sáez, José Antonio López; Maidana, Nora I.; Rabassa, Jorge; Candel, María Soledad

doi:10.1016/j.palaeo.2009.11.033

Cited by 69 publications

(67 citation statements)

References 41 publications

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“…small (<700 years or <10% of the approximate >8,000 cal year BP age for H1), further refinements of the age of the H1 eruption is of interest, since this was the largest Holocene eruption in the southern Andes during the Holocene (Stern, 1991(Stern, , 2004(Stern, , 2008Naranjo and Stern, 1998), and it produced a widely distributed tephra layer that has been used as a chronologic marker for numerous paleoclimate (Waldmann et al, 2009;Unkel et al, 2010;Borromei et al, 2010;Bjork et al, 2012;Villa-Martínez et al, 2012;Menounos et al, 2013) and archaeological studies (Prieto et al, 2013) in southern Patagonia.…”

Section: H1 Eruption Agementioning

confidence: 99%

“…The tephra deposits produced by all these eruptions have already and will continue to provide important chronological markers for archaeologic (Prieto et al, 2013) and paleoclimate (Waldmann et al, 2009;Borromei et al, 2010;Unkel et al, 2010;Hermanns and Biester, 2011;Björck et al, 2012;Villa-Martínez et al, 2012;Menounos et al, 2013;McCulloch et al, 2014) studies in southern Patagonia. For these reasons, as well as being significant for evaluating volcanic risks and hazards for the inhabitants of (Fig.…”

Section: Introductionmentioning

confidence: 99%

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Holocene tephrochronology around Cochrane (~47° S), southern Chile

Stern

Moreno²,

Henríquez³

et al. 2015

andgeo

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ABSTRACT. Two Holocene tephras encountered in outcrops, cores and trenches in bogs, and lake cores in the area around Cochrane, southern Chile, are identified (based on their age, tephra glass color and morphology, mineralogy, and both bulk and glass chemistry) as H1 derived from Hudson volcano, and MEN1 derived from Mentolat volcano. New AMS radiocarbon ages indicate systematic differences between those determined in lake cores (MEN1=7,689 and H1=8,440 cal yrs BP) and surface deposits (MEN1=7,471 and H1=7,891 cal yrs BP), with the lake cores being somewhat older. H1 tephra layers range from 8 to 18 cm thick, suggesting that both the area of the 10 cm isopach and the volume of this eruption were larger than previously suggested, but not greatly, and that the direction of maximum dispersion was more to the south. MEN1 tephra layers range from 1-4 cm in thickness, indicating that this was probably a reasonably large (>5 km 3 ) eruption. Some of the lake cores also contain thin layers (<2 cm) of late Holocene H2 tephra and the recent H3 (1991 AD) tephra, both derived from the Hudson volcano. No tephra evidence has been observed for any late Pleistocene tephra, nor for the existence of the supposed Arenales volcano, proposed to be located west of Cochrane. Keywords: Tephra, Tephrochronology, Volcanism, Hudson, Mentolat, Andes, Chile. RESUMEN. Tefrocronología holocénica cerca de Cochrane (~47° S), Chile Austral. Dos tefras holocenas reconocidas en af loramientos, testigos y trincheras en pantanos y lagos de la zona de Cochrane, Chile, han sido identificadas (sobre la base de su edad, color y morfología de las partículas vítreas, mineralogía y composición química de la roca total y del vidrio) como H1 y MEN1, provenientes de los volcanes Hudson y Mentolat, respectivamente. Nuevas edades radiocarbónicas AMS asociadas a estas tefras revelan diferencias sistemáticas entre los testigos lacustres (MEN1=7,689 y H1=8,440 años cal. AP) y los depósitos en superficie (MEN1=7,471 y H1=7,891 años cal. AP), en que las edades en los testigos lacustres son algo más antiguas. Los horizontes de la tefra H1 varían entre 8 y 18 cm de espesor, lo que indicaría que tanto el área de la isópaca de 10 cm como el volumen de esta erupción fue levemente mayor a lo previamente reconocido, y que la dirección de dispersión fue más hacia el sur. Los niveles de la tefra MEN1 varían entre 1 y 4 cm de espesor, lo que sugiere que esta fue una erupción relativamente grande (>5km 3 ). Algunos testigos lacustres también incluyen niveles más finos (<2 cm) de otra tefra (H2) del Holoceno tardío y de la tefra (H3) asociada a la erupción del año 1991, ambas derivadas del volcán Hudson. No se encontraron evidencias de tefras pleistocénicas tardías ni tampoco de la presencia del volcán Arenales, supuestamente ubicado al oeste de Cochrane y cuya existencia ha sido puesta en duda.

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Section: H1 Eruption Agementioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Holocene tephrochronology around Cochrane (~47° S), southern Chile

Stern

Moreno²,

Henríquez³

et al. 2015

andgeo

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“…Even extreme events such as floods and earthquakes can be identified using diatoms (Nelson et al 1996;Kashima 2003;Atwater et al 2004;Borromei et al 2010;Schütt et al 2010;Wiklund et al 2010;Saegusa et al 2011). Some environmental variables can be estimated quantitatively using diatom-based transfer functions (Shinneman et al 2009(Shinneman et al , 2010.…”

Section: Introductionmentioning

confidence: 99%

Increased precipitation during the Little Ice Age in northern Taiwan inferred from diatoms and geochemistry in a sediment core from a subalpine lake

et al. 2013

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We studied diatoms in a 55.5-cm-long sediment core from a subalpine lake in northern Taiwan, Tsuifong Lake (TFL), to investigate environmental changes from AD 490 to present. Diatom assemblages of the last century were dominated by acidophilous species, whereas alkaliphilous taxa dominated the record between AD 1480 and 1910. Over the studied time frame, four decadal periods with high precipitation were inferred from evidence of elevated soil input from the watershed, supported by the stable isotope signatures (d 15 N, d 13 C) of organic matter and magnetic susceptibility of the sediments. We compared the inferred changes in pH of TFL to values obtained from three other Taiwanese subalpine lakes. The present study revealed that elevated precipitation was associated with increased solar irradiance over the last five centuries, with a stable dry period between AD 490 and 1450. Acidification of TFL in the last *100 years was a consequence of deforestation and acid rain.

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“…Many studies of Late Quaternary palaeoecological conditions from Isla Grande de Tierra del Fuego, southernmost Patagonia, were largely based on palynological records from terrestrial sediments Rabassa, 1987, 1995;heusser, 1989, 1998, 2003Markgraf, 1993;Borromei, 1995;Quattrocchio and Borromei, 1998;Mauquoy et al, 2004;Borromei et al, , 2010Borromei et al, , 2014Borromei and Quattrocchio, 2008;Markgraf and huber, 2010;Musotto, 2013;Waldmann et al, 2014;Musotto et al, 2016a, in press; among others works). Studies on dinocyst assemblages and palynofacies from Late Quaternary deposits of the southern South america are still limited to a few contributions (Borromei andQuattrocchio, 2001, 2007;Grill et al, 2002;Candel et al, 2009Candel et al, , 2011Candel et al, , 2012Rabassa et al, 2009;Candel, 2010;Fernández et al, 2014).…”

Section: Resumen Revisión De La Reconstrucción Paleoambiental De Secmentioning

confidence: 99%

Review of the Palaeoenvironmental Reconstruction of Late Quaternary Marine Sequences, Tierra Del Fuego (Argentina)

Candel

Borromei

2016

PEAPA

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Abstract. This work is an updated review of the knowledge on the evolution and development of palaeoenvironments during the holocene marine ingression and posterior regressive event in Tierra del Fuego. During the beginning of the marine transgression, ca. 8,000 cal yr BP, the vegetation in the southern coastal areas along the Beagle Channel was mainly arboreal with dominance of Nothofagus forest and scarcity of shrub and herbaceous communities, while in the northeastern atlantic coast, the treeless steppe was replaced by a relatively open Nothofagus forest. The early-Middle holocene aquatic assemblages were characterized by a scarce occurrence of marine components, especially dinoflagellate cysts, suggesting the development of low energy estuarine environments with low-salinities caused by glacier meltwater discharge. after 6,000 cal yr BP, an increase in the number of aquatic species was observed with dominance of Peridiniales dinoflagellate cysts, indicating the establishment of marginal marine environments with low to moderate salinities and high nutrient levels. During the last 1,000 cal yr BP, the littoral vegetation along the Beagle Channel showed an open Nothofagus forest and the development of peatlands, while in the northeastern atlantic coast the steppe vegetation developed under less humid environmental conditions related to the marine regressive event. These assemblages have a similar composition to those observed in modern sediments of the Beagle Channel and suggest palaeoenvironmental conditions comparable to today.

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Multiproxy record of Holocene paleoenvironmental change, Tierra del Fuego, Argentina

Cited by 69 publications

References 41 publications

Holocene tephrochronology around Cochrane (~47° S), southern Chile

Holocene tephrochronology around Cochrane (~47° S), southern Chile

Increased precipitation during the Little Ice Age in northern Taiwan inferred from diatoms and geochemistry in a sediment core from a subalpine lake

Review of the Palaeoenvironmental Reconstruction of Late Quaternary Marine Sequences, Tierra Del Fuego (Argentina)

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