Rock-magnetic and paleomagnetic studies on late-Holocene sediments from Laguna Cháltel (Patagonia, Argentina)

Palermo, Pedro; Irurzun, Maria Alicia; Gogorza, Claudia; Sinito, Ana M.; Ohlendorf, Christian; Zolitschka, Bernd

doi:10.1016/j.jsames.2018.11.028

Cited by 5 publications

(9 citation statements)

References 39 publications

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“…Table 1 shows the mean values of all measured parameters from Pcc (Palermo et al, 2019) and this study (cores CHA04/6 and CHA04/8). All cores show very similar B CR and S-ratio values, which vary in a very narrow range.…”

Section: Resultsmentioning

confidence: 73%

“…The second magnetic phase could either be maghemite or Ti-hematite. If maghemite is present, the end value of k after cooling should be lower than the initial value, and some samples show this behaviour (Palermo et al, 2019). In this case, transformation from maghemite to hematite is observed.…”

Section: Resultsmentioning

confidence: 99%

“…To date the sediments of this study (CHA04/6 and CHA04/8), a correlation with cores CHA04/1, CHA04/2, CHA04/3, and CHA04/4 (Palermo et al, 2019) was performed. Particularly, the central core CHA04/6 is similar to Pcc, regardless of the parameter used (Table 1, top two lines).…”

Section: Resultsmentioning

confidence: 99%

“…Detailed sedimentologic and geochemical analyses as well as dating of cores CHA04/2 and CHA04/4 were reported by Ohlendorf et al (2014). Cores CHA04/1, CHA04/2, CHA04/3, and CHA04/4 were analysed for rock magnetism by Palermo et al (2019) to investigate whether these sediments fulfil the necessary conditions for RPI (Tauxe, 1993). These cores are denoted in this study as Palermo central cores (Pcc).…”

Section: Methodsmentioning

confidence: 99%

“…For most lake sediments from Patagonia, palaeosecular variations (PSV) and relative palaeointensities (RPI) were the only parameters studied when magnetic analyses were used (Gogorza et al, 2002, 2004, 2006; Irurzun et al, 2008, 2009; Lisé-Pronovost et al, 2013; Palermo et al, 2019). Just three previous investigations used magnetic measurements as indicators of environmental changes (Lisé-Pronovost et al, 2014, 2015; Irurzun et al, 2014), and all are from Laguna Potrok Aike.…”

Section: Introductionmentioning

confidence: 99%

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Testing lake-level reconstructions based on rock magnetic proxies for the sediment record of Laguna Cháltel (Patagonia, Argentina)

Irurzun¹,

Palermo²,

Gogorza³

et al. 2020

Quat. res.

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This study was carried out on sediment cores collected with a gravity corer from Laguna Cháltel, an almost circular crater lake located in Patagonia, Argentina (49.9°S, 71°W). The main magnetic carrier was Ti-magnetite in the pseudo–single domain range. A model using magnetic grain size and concentration, previously applied to Laguna Potrok Aike to infer lake-level changes, was used for Laguna Cháltel. The main requirement to apply the model is uniform magnetic mineralogy, which is the case for Laguna Cháltel. After magnetic data were compared with previously studied lake levels, it was found that the magnetic proxies that best follow hydrologic changes are ARM/SIRM (anhysteretic remanent magnetisation/saturation of isothermal remanent magnetisation) and ARM. The concentration proxy (ARM measured with a 100 mT alternating field and 0.05 mT direct field) was also used as wind indicator. High wind strength was found at around 3650 cal yr BP, and low wind strength for the last century. ARM/SIRM and ARM were used to infer the strength of fluvial runoff into the lake for a core collected close to the shore and near a tributary. The results show that the magnetic model is promising for inferring lake-level variations, particularly in Patagonian lakes.

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Section: Resultsmentioning

confidence: 73%

Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%