A 106ka paleoclimate record from drill core of the Salar de Atacama, northern Chile

“…The South American tropics are an important component of the tropical climate system, and accordingly the number of published paleoclimatic records from this region has increased in recent years (e.g., Baker et al, 2001aBaker et al, , 2001bBetancourt et al, 2000;Bobst et al, 2001;Maslin and Burns, 2000;Mayle et al, 2000;Peterson et al, 2000;Seltzer et al, 2000). Even so, very few continental records extend to intervals significantly earlier than the last glacial maximum (LGM), approximately 20,000 yr ago.…”

Section: Introductionmentioning

confidence: 99%

Hydrologic variation during the last 170,000 years in the southern hemisphere tropics of South America

et al. 2004

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Despite the hypothesized importance of the tropics in the global climate system, few tropical paleoclimatic records extend to periods earlier than the last glacial maximum (LGM), about 20,000 years before present. We present a well-dated 170,000-year time series of hydrologic variation from the southern hemisphere tropics of South America that extends from modern times through most of the penultimate glacial period. Alternating mud and salt units in a core from Salar de Uyuni, Bolivia reflect alternations between wet and dry periods. The most striking feature of the sequence is that the duration of paleolakes increased in the late Quaternary. This change may reflect increased precipitation, geomorphic or tectonic processes that affected basin hydrology, or some combination of both. The dominance of salt between 170,000 and 140,000 yr ago indicates that much of the penultimate glacial period was dry, in contrast to wet conditions in the LGM. Our analyses also suggest that the relative influence of insolation forcing on regional moisture budgets may have been stronger during the past 50,000 years than in earlier times.

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“…Their low lake level stages correspond to glacial stages (from MIS 4 to MIS 8) (Bobst et al 2001;Fritz et al 2004;Fritz et al 2007;Placzek et al 2006). Nevertheless, humid conditions prevailed during the Last Glacial Maximum in the Altiplano (Baker et al 2001;Fritz et al 2004;Sáez et al 2007) (Fig.…”

Section: Paleoclimate and Water Availabilitymentioning

confidence: 94%

“…Uyuni Lake changes are based mostly on the percent carbonate content (Fritz et al 2004, Placzek et al 2006. Atacama Lake changes are based in the lithofacies distribution (Bobst et al 2001). Lake Titicaca changes are based on % of freshwater diatom variations (Fritz et al 2007 Th date uncertainties (see Tables 1 and 2).…”

Section: Paleoclimate and Water Availabilitymentioning

confidence: 99%

Igneous Origin of CO2 in Ancient and Recent Hot-Spring Waters and Travertines from the Northern Argentinean Andes

Gibert

Taberner

Sáez

et al. 2009

Journal of Sedimentary Research

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Thermal travertines are an archive of CO 2 sources and sinks in hydrothermal systems.Two major regional factors control travertine precipitation: water availability and CO 2 supply.Thus, travertines form a valuable archive of hydrodynamic variability and sources of main contributions to dissolved inorganic carbon (DIC). It is relevant to determine the main DIC sources of thermal waters (i.e., organic-matter degradation, recycled from older carbonates, emission of deep-seated magmatic CO 2 ), as they are key inputs to calculate the lithosphere -atmosphere CO 2 budget. The Antuco travertine from the Central Andes represents one of such archives, with a total of 500 ky record of accretionary periods (dated as 425-320, 260 and 155 ky BP) related to high hydrothermal activity of hot springs. It consist of two travertine units: (1) a lower massive unit displaying large calcite pseudomorphs after aragonite that precipitated in proximal ponds with Sr signatures in carbonate precipitates has been proven to be of major relevance to evaluate the CO 2 sources along fault zones in this study.

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A 106ka paleoclimate record from drill core of the Salar de Atacama, northern Chile

Cited by 198 publications

References 68 publications

Across the Arid Diagonal: deglaciation of the western Andean Cordillera in southwest Bolivia and northern Chile

Across the Arid Diagonal: deglaciation of the western Andean Cordillera in southwest Bolivia and northern Chile

Hydrologic variation during the last 170,000 years in the southern hemisphere tropics of South America

Igneous Origin of CO2 in Ancient and Recent Hot-Spring Waters and Travertines from the Northern Argentinean Andes

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