High‐resolution paleomagnetic records from Laguna Potrok Aike (Patagonia, Argentina) for the last 16,000 years

Gogorza, Claudia; Irurzun, Maria Alicia; Sinito, Ana M.; Lisé-Pronovost, Agathe; St‐Onge, Guillaume; Haberzettl, Torsten; Ohlendorf, Christian; Kastner, Stephanie; Zolitschka, Bernd

doi:10.1029/2011gc003900

Cited by 20 publications

(24 citation statements)

References 85 publications

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“…Our study indicates the best RPI ratio is NRM 20mT /SIRM, suggesting that the magnetic grain sizes are in the PSD region, which is consistent with the rock magnetic analysis. Similar results were found in Laguna Potrok Aike (Gogorza et al 2012) and Palmer Deep (Brachfeld et al 2000). Figure 9 shows the comparison between the RPI obtained in this work with other records from Antarctica.…”

Section: Selection Of the Best Normalization Ratio And Comparison Witsupporting

confidence: 82%

“…Lakes have been widely used for palaeoclimatic and palaeomagnetic studies around the world (e.g. Stoner et al 2003, Irurzun et al 2009, Gogorza et al 2012, Kokfelt & Muscheler 2012, Lisé-Pronovost et al 2014 and references therein). In Antarctica, most of the studies have been carried out on ice cores, marine sediments or igneous rocks (e.g.…”

Section: Introductionmentioning

confidence: 99%

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Relative palaeointensity and reservoir effect on Lake Esmeralda, Antarctica

et al. 2017

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Four cores from the bottom sediments of Lake Esmeralda, Vega Island, Antarctica (60°48'S, 57°37'W) were studied. Analysis of rock magnetics indicates that the main carriers of magnetization are ferrimagnetic minerals, predominantly pseudo-single-domain (titano-) magnetite with a small proportion of paramagnetic and antiferromagnetic minerals. The magnetic grain size of the samples is in the range of 1–5 μm and the variation of the interparametric ratios is less than one order of magnitude. Demagnetization of the natural remanent magnetization shows a stable remanent magnetization in most of the samples. Thus, the samples fulfil the necessary conditions to calculate relative palaeointensity (RPI) and the curves obtained correlated with global models enabling dating of the cores. The 250 cm of sediment recovered spans the last 10 200 yr bp. Finally, some samples with high organic matter content were dated by accelerator mass spectrometry 14C. By comparison with the age defined by the RPI curves, a reservoir effect of c. 5200 years is suggested for this region of Vega Island.

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Section: Selection Of the Best Normalization Ratio And Comparison Witsupporting

confidence: 82%

Section: Introductionmentioning

confidence: 99%

Relative palaeointensity and reservoir effect on Lake Esmeralda, Antarctica

et al. 2017

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“…Additional sediment records that were not used in the CALS10k.2 and HFM.OL1.A1 models have been employed in GGF100k. They mostly come from lakes covering the past 10 ka and beyond, for example, Lake Yogo (Hyodo et al, ); Beppu Bay (Ohno et al, ); Shikoku, Japan Sea (Ohno et al, ); Sun‐Moon Lake, Taiwan (Lee et al, ); Lake Tangra Yumco, Tibetan Plateau (Henkel et al, ); MD06‐3040, China Sea (Zheng et al, ); Mavora Lakes, New Zealand (Turner et al, ); LPA and PTA03, Laguna Potrok Aike, Argentina (Gogorza et al, ; Kliem et al, ; Lisé‐Pronovost et al, ); and Indonesian records from South Makassar Basin and Celebs Sea (Lund et al, ).…”

Section: Resultsmentioning

confidence: 99%

Extending Global Continuous Geomagnetic Field Reconstructions on Timescales Beyond Human Civilization

Panovska

Constable

Korte

2018

Geochem Geophys Geosyst

141

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Study of the late Quaternary geomagnetic field contributes significantly to understanding the origin of millennial‐scale paleomagnetic secular variations, the structure of geomagnetic excursions, and the long‐term shielding by the geomagnetic field. A compilation of paleomagnetic sediment records and archeomagnetic and lava flow data covering the past 100 ka enables reconstruction of the global geomagnetic field on such long‐term scales. We use regularized inversion to build the first global, time‐dependent, geomagnetic field model spanning the past 100 ka, named GGF100k (Global Geomagnetic Field over the past 100 ka). Spatial parametrization of the model is in spherical harmonics and time variations with cubic splines. The model is heavily constrained by more than 100 continuous sediment records covering extended periods of time, which strongly prevail over the limited number of discrete snapshots provided by archeomagnetic and volcanic data. Following an assessment of temporal resolution in each sediment's magnetic record, we have introduced smoothing kernels into the forward modeling when assessing data misfit. This accommodates the smoothing inherent in the remanence acquisition in individual sediment paleomagnetic records, facilitating a closer fit to both high‐ and low‐resolution records in regions where some sediments have variable temporal resolutions. The model has similar spatial resolution but less temporal complexity than current Holocene geomagnetic field models. Using the new reconstruction, we discuss dipole moment variations, the time‐averaged field, and paleomagnetic secular variation activity. The new GGF100k model fills the gap in the geomagnetic power spectrum in the frequency range 100–1,000 Ma−1.

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“…57,58 A similar situation was also registered in southernmost Patagonia at Potrok Aike lagoon; there the palaeosecular variation record yielded logs of negative inclination values with large amplitude variations in declination during the early Holocene at ~7-9 kybp. 59 These large reverse pulses spanning short periods might alternate with normal geomagnetic field directions that might mask or cover up their existence in the palaeomagnetic record.…”

Section: Discussionmentioning

confidence: 99%

Detailed palaeomagnetic record at Rose Cottage Cave, South Africa: Implications for the Holocene geomagnetic field behaviour and chronostratigraphy

Nami¹,

Vasquez²,

Wadley³

et al. 2020

S. Afr. J. Sci.

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Palaeomagnetic data from a sedimentary section spanning the Holocene and terminal Pleistocene (~13 kya) from Rose Cottage Cave, eastern Free State (South Africa), are reported. The palaeomagnetic analysis took into account rock magnetism and directional analysis. The former reveals that most samples show stable single domain and superparamagnetic particles of Ti-poor magnetite and haematite. Natural remanent magnetisation directions were determined by progressive alternating field demagnetisation methodology. Directional analysis shows normal directions between samples 18 to 39 and 85 to 92; however, during the Early and Late Holocene in samples principally from RC40 to 84 ‘anomalous’ directions occurred. There is a significant westward shift in declination of ~80°, and a conspicuous fluctuating inclination in the lower part of the section during the Early Holocene at ≥9.5 kya and before ~12.0/13.0 kya. This palaeomagnetic record might become a chronostratigraphical marker for latest Pleistocene/Holocene sedimentary deposits in South Africa. Our two new accelerator mass spectrometry radiocarbon dates for the sampled deposit are 9500±50 BP and 1115±30 BP.

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High‐resolution paleomagnetic records from Laguna Potrok Aike (Patagonia, Argentina) for the last 16,000 years

Cited by 20 publications

References 85 publications

Relative palaeointensity and reservoir effect on Lake Esmeralda, Antarctica

Relative palaeointensity and reservoir effect on Lake Esmeralda, Antarctica

Extending Global Continuous Geomagnetic Field Reconstructions on Timescales Beyond Human Civilization

Detailed palaeomagnetic record at Rose Cottage Cave, South Africa: Implications for the Holocene geomagnetic field behaviour and chronostratigraphy

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