Geochemical characterization of volcanic ashes from recent events in Northern Patagonia Andean Range by INAA

Daga, Romina; Guevara, Sergio Ribeiro; Sánchez, María Lidia; Arribére, Marı́a

doi:10.1007/s10967-006-0447-4

Cited by 16 publications

(25 citation statements)

References 6 publications

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“…Tephras were sieved (>500 µm, 500–250 µm, 250–125 µm, 125–63 µm, <63 µm fractions), and the juvenile volcanic components were identified and separated from the silty matrix according to Daga et al . (2006). White and brownish pumice shards, scoria fragments and glass shards were morphologically characterised under a binocular magnifying glass and scanning electron microscope, operating at 10 kV.…”

Section: Methodsmentioning

confidence: 99%

“…The high frequency of volcanic events in this area merits an accurate characterisation of the volcanic products as well as the evaluation of their spatial distribution. Few comprehensive geochemical and morphological characterisations of recent volcanic ash produced by the sources in southern Chile have been undertaken (Daga et al ., 2006, 2008; Bertrand et al ., 2008), with the result that accurate tephrochronological correlations and evaluations of their spatial distribution have not been possible.…”

Section: Introductionmentioning

confidence: 99%

“…According to earlier studies (Daga et al ., 2006, 2008), the geochemical characterisation of the glass fraction of volcanic products in well‐preserved lacustrine tephras enabled the identification of two volcanic sources that have impacted on the Nahuel Huapi National Park: Cordon Caulle (Puyehue–Cordón Caulle system) and Calbuco volcanoes (Fig. 1).…”

Section: Introductionmentioning

confidence: 99%

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Tephrochronology of recent events in the Andean Range (northern Patagonia): spatial distribution and provenance of lacustrine ash layers in the Nahuel Huapi National Park

Daga

Guevara

Sánchez

et al. 2010

J Quaternary Science

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Tephrochronology is a powerful tool for dating sedimentary sequences, especially in Patagonia, where a large number of active volcanoes have produced frequent historical eruptions. Short lacustrine sedimentary sequences were extracted from the lakes Moreno Oeste and Ton cek (Nahuel Huapi National Park). Seventeen volcanic ash layers were identified in both cores, 210 Pb and 137 Cs were used for dating techniques, and historical volcanic records were employed for correlation. White pumice and glass shards from the tephras were characterised by measuring major and trace element contents by instrumental neutron activation analysis. Two volcanic sources -the Cordó n Caulle and the Calbuco volcanoes -were recognised as the prevailing systems that impacted the area in the past 800-1000 a. The Calbuco volcano was mainly responsible for the nine tephras identified in the Lake Ton cek sequence. Four of these nine tephras also contained material from the Cordó n Caulle complex, and could be interpreted as composite tephras or possible reworked ones. The Calbuco volcano showed predominant influences in the Lake Moreno Oeste sequence. Six of the eight tephras identified in such a sequence were from the Calbuco volcano, and three of these six contained material from the Cordó n Caulle complex. The other two were from the Cordó n Caulle complex, with contributions from the Calbuco volcano in one of them. These findings show that the high frequency of volcanic events in the study region demands an accurate characterisation of the products generated by each source, as well as an evaluation of their spatial distribution, to obtain a consistent framework for dating recent environmental changes.

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Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Tephrochronology of recent events in the Andean Range (northern Patagonia): spatial distribution and provenance of lacustrine ash layers in the Nahuel Huapi National Park

Daga

Guevara

Sánchez

et al. 2010

J Quaternary Science

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“…3, 4). Previous studies performed on sedimentary sequences from water bodies from Nahuel Huapi National Park demonstrated that the region was impacted by frequent volcanic eruptions from the Calbuco volcano and Puyehue-Cordón Caulle volcanic system with the Calbuco volcano eruptions being the most important affecting the south of the park (Daga et al, 2006(Daga et al, , 2008a. However, it is not possible to assign dates to the eruptions without a better geochemical characterisation of the tephras providing a basis for correlation with potential source eruptions (Daga et al, 2008a).…”

Section: Discussionmentioning

confidence: 99%

Palaeolimnology of Lake Hess (Patagonia, Argentina): multi-proxy analyses of short sediment cores

et al. 2009

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In contrast with the extensive palaeolimnological studies carried out in North America and Europe, relatively few studies have described the anthropogenic and/or climate impacts in Patagonian lakes. We addressed these issues by analysing geochemistry, lithology, pigments and chironomid remains from sediment cores collected from Lake Hess (41°22 0 20 00 S, 71°44 0 0 00 W) located in the Nahuel Huapi National Park in northern Patagonia. The aim of this study is to provide a palaeoenvironmental and climate reconstruction of the past ca. three centuries for this cold oligotrophic, quasi-pristine lake which receives meltwaters from the Tronador ice cap. Chronology was based on 137 Cs and 210 Pb measurements of the upper sediments, and the inferred sedimentation rate of 23.2 mg cm -2 y -1 (0.15 cm y -1

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“…Tephra layers were not incorporated into the model but were used as additional data to verify the robustness of the age model. Previous tephrocronological studies in the area helped to identify volcanic eruptions responsible for ash deposition in both lakes during the last 200 years (Daga et al 2006Bertrand et al 2008Bertrand et al , 2014Ribeiro Guevara et al 2010;Fontijn et al 2014;Serra et al 2016, Williams et al 2016). …”

Section: Chronologiesmentioning

confidence: 99%

Reconstructing recent environmental changes using non-biting midges (Diptera: Chironomidae) in two high mountain lakes from northern Patagonia, Argentina

Motta

Plastani

et al. 2017

J Paleolimnol

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Geochemical characterization of volcanic ashes from recent events in Northern Patagonia Andean Range by INAA

Cited by 16 publications

References 6 publications

Tephrochronology of recent events in the Andean Range (northern Patagonia): spatial distribution and provenance of lacustrine ash layers in the Nahuel Huapi National Park

Tephrochronology of recent events in the Andean Range (northern Patagonia): spatial distribution and provenance of lacustrine ash layers in the Nahuel Huapi National Park

Palaeolimnology of Lake Hess (Patagonia, Argentina): multi-proxy analyses of short sediment cores

Reconstructing recent environmental changes using non-biting midges (Diptera: Chironomidae) in two high mountain lakes from northern Patagonia, Argentina

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