Deglacial palaeoclimate at Puerto del Hambre, subantarctic Patagonia, Chile

Heusser, Calvin J.; Heusser, Linda E.; Lowell, Thomas V.; Moreira, M Andrés; Moreira, M Simón

doi:10.1002/(sici)1099-1417(200002)15:2<101::aid-jqs500>3.0.co;2-y

Cited by 47 publications

(29 citation statements)

References 59 publications

(89 reference statements)

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“…Pessenda et al (1998) report amounts of b13C between -15%o and -2l% o for C4-type, non-forested vegetation, whereas amounts for C3-type forest communities range from -27%o to -29.5%0. Pollen data from Puerto del Hambre (Heusser et al 2000) imply the presence of dominant grass and heath communities in the basal part of core HE98-1C, consistent with b13 enrichment from C4-type nonarboreal vegetation.…”

Section: Resultsmentioning

confidence: 60%

¹⁴C Age of Glaciation in Estrecho De Magallanes–Bahía Inútil, Chile

Heusser¹

1999

Radiocarbon

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ABSTRACT. Basal 14C dates from a core of the mire at Puerto del Hambre (53°36'21"S, 70°55'53"W), located within the area of glaciation in Estrecho de Magallanes-Bahia Inutil, Chile, are no older than 14,455 ± 115 yr BP. The 14C dates are on samples from which screening isolated autochthonous plant remains. Previous '4C dates of 15,800 ± 200, 16,590 ± 320, and 16,290 ± 140 yr BP are from bulk samples collected from similar basal increments at the site during 3 separate, independent coring operations. The previous suite of 14C dates was suspected to be contaminated by older carbon in the light of chronological evidence, which indicates a 14C age of approximately 14,850 yr BP for glaciation elsewhere in southern Chile. Contamination by "infinitely old" carbon reworked from nearby Tertiary beds and redeposited at Puerto del Hambre is evidently the cause for the older 14C dates.

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Section: Resultsmentioning

confidence: 60%

¹⁴C Age of Glaciation in Estrecho De Magallanes–Bahía Inútil, Chile

Heusser¹

1999

Radiocarbon

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“…In contrast to East Antarctica, where intense iceberg calving is related to interglacial stages, maximum iceberg calving rates from Patagonia and the Antarctic Peninsula document the rapid disintegration of marine ice masses during climate amelioration associated with glacial terminations and less pronounced during short-term climate perturbations (Hofrnann 1999;Diekmann et al 2000). Patagonian land records are consistent with these findings and moreover suggest interhemispheric teleconnections with northernhemispheric climate dynamics (Lowell et al 1995;Heusser et al 2000;McCulloch et al 2000).…”

Section: Ice-rafted Detritus (Ird)mentioning

confidence: 67%

Terrigenous Sediment Supply in the Polar to Temperate South Atlantic: Land-Ocean Links of Environmental Changes during the Late Quaternary

Diekmann

Fütterer

Grobe

et al. 2003

The South Atlantic in the Late Quaternary

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Terrigenous sediment parameters in modem sea-bottom samples and sediment cores of the South Atlantic are used to infer variations in detrital sources and modes of terrigenous sediment supply in response to environmental changes through the late Quaternary climate cycles. Massaccumulation rates of terrigenous sediment and fluxes of ice-rafted detritus are discussed in terms of temporal variations in detrital sediment input from land to sea. Grain-size parameters ofterrigenous mud document the intensity of bottom-water circulation, whereas clay-mineral assemblages constrain the sources and marine transport routes of suspended fine-grained particulates, controlled by the modes of sediment input and patterns of ocean circulation. The results suggest low-frequency East Antarctic ice dynamics with dominant lOO-kyr cycles and high rates of Antarctic Bottom Water formation and iceberg discharge during interglacial times. In contrast, the more subpolar ice masses of the Antarctic Peninsula also respond to short-term climate variability with maximum iceberg discharges during glacial terminations related to the rapid disintegration of advanced ice masses. In the northern Scotia Sea, increased sediment supply from southern South America points to extended ice masses in Patagonia during glacial times. In the southeastern South Atlantic, changes in regional ocean circulation are linked to global thermohaline ocean circulation and are in phase with northern-hemispheric processes of ice build-up and associated formation of North Atlantic Deep Water, which decreased during glacial times and permitted a wider extension of southern-source water masses in the study area.

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“…6) in a core from Puerto del Hambre (area #17 in Fig. 1) described and dated in detail by Heusser et al (2000). Other thinner and spatially less extensive Reclus tephra, which are younger than R 1 , occur in the vicinity of both Torres del Paine and Ultima Esperanza (areas #6 and #7 in Fig.…”

Section: Late-glacial Reclus R 1 Eruptionmentioning

confidence: 96%

“…Burney as the source for white Tephras (Stern and Kilian 1996;Stern 2004), plates and plate boundaries, and 22 numbered geographic areas where tephra layers were observed and collected (Tables 1, 4, 7 and 10). These areas include 1 Lago Cardiel (Markgraf et al 2003); 2 North shore of Lago Viedma; 3 Northeast shore of Lago Argentino between Sosiego and Charles Fuhr ranches; 4 South shore of Lago Argentino between Calafate and Lago Roca; 5 Cordillera Baguales; 6 Torres del Paine park; 7 Ultima Esperanza fjord; 8 Rubens river; 9 Thomas Gold (Massone 1989) and Potrok Aike (Haberzettl et al 2007) lakes; 10 Peninsula Muñoz Gamero (Kilian et al 2003; 11 North shore of Skyring fjord; 12 East shore of Otway fjord and Lago Blanco; 13 Punta Arenas; 14 North-central Tierra del Fuego (Stern 1991); 15 Porvenir, Cape Boqueron and Altos de Boqueron (Stern 1990); 16 Tres Arroyos archaeological site (Massone 1987); 17 Puerto del Hambre (Heusser et al 2000) 18 Northern Dawson Island (McCulloch and Bentley 1998;McCulloch and Davies 2001); 19 Cape Cameron and Rusphen river; 20 Chico river; 21 La Mission north of Rio Grande (Markgraf 1980); 22 Tunel archaological site along the Beagle Canal (Orquera and Piana 1987) A and III, and the Hudson volcano, located in the southern portion of the Andean Southern Volcanic Zone (SVZ in Fig. 1), as the source for green Tephra II.…”

Section: Introductionmentioning

confidence: 99%

“…Stern (1991Stern ( , 1992 obtained new 14 C ages from soils containing these tephra, and based on these new ages revised Auer's tephrochronology for southernmost Patagonia. This revised tephrochronology of southernmost Patagonia has been widely applied by Quaternary geologists to the chronological analysis of tephra-bearing bog and lake sediment cores and outcrops which constrain the late-glacial and Holocene paleoclimatic and paleogeographic evolution of southernmost Patagonia (Heusser 1995;Clapperton et al 1995;Marden and Clapperton 1995;Marden 1997;McCulloch and Bentley 1998;Heusser et al 2000;McCulloch and Davies 2001;Markgraf et al 2003;Kilian et al 2003Kilian et al , 2007aMcCulloch et al 2005a, b;Haberzettl et al 2007;Martínez and Moreno 2007), as well as for the chronological analysis of archaeological excavations (Massone 1987(Massone , 1989Favier Dubois and Borrero 1997).…”

Section: Introductionmentioning

confidence: 99%

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