New evidence of an excursion of the geomagnetic field recorded in Late Pleistocene sediments in Argentina

Orgeira, María Julia; Walther, Ana María; Sinito, Ana M.; Vilas, Juan F.; Conti, yC.

doi:10.1016/0895-9811(96)00009-0

Cited by 2 publications

(1 citation statement)

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“…Remarkably is that this dis- (Laj & Channell, 2007). Is also remarkably, the agreement of VGPs located in southern Africa with the VGPs calculated for the Late Pleistocene excursion identified in several parts of Argentina and dated at ~26 -30 ky BP (Orgeira et al, 1990(Orgeira et al, , 1996Vizán & Azcuy, 2010). Besides, the location of transitional VGPs in Africa and Australasia were observed in several records from different periods of the Earth history (e.g., Coe & Glen, 2004;Creer & Ispir, 1970;Gurarii, 2005;Herrero-Bervera & Coe, 1999;Hoffman & Singer, 2004;Ohno et al, 2008).…”

Section: Paleomagnetic Study Sampling Methods and Resultssupporting

confidence: 76%

Paleomagnetic Results from Archaeological Sites in Argentinean Patagonia: Evidence for the Holocene Geomagnetic Excursions in Southern South America and Its Chronostratigraphic Implications

Nami¹

2019

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Detailed palaeomagnetic research performed in archaeological and paleontological sites in southern South America yielded a number of highly fluctuating paleosecular variation records with geomagnetic field excursion(s) during the Holocene. To assess this topic a variety of sections of recent sediments were sampled. In the case presented here they belong from diverse continental sedimentary sequences formed in coastal marine and cave's environments. Paleomagnetic samplings were performed in several deposits in San Blas Bay and Pali Aike areas, respectively located in the northern and southern parts of Argentinean Patagonia region. To collect samples, cylindrical plastic containers 2.5 cm long and 2 cm diameter were carefully pushed into the sections, overlying each other by about 50 percent. Their strike and dip were measured using a Brunton compass and inclinometer; they were consolidated with sodium silicate after removal and numbered from top to bottom. All samples were subjected to progressive AF demagnetization in steps of 3, 6, 9, 12, 15, 20, 25, 30, 40 and 60 mT in a 3-axis static degausser attached to a 2 G cryogenic magnetometer. Additional steps from 80 to 120 mT were used in some samples. Characteristic remnant magnetization was calculated using principal-components analysis, with the best-fitting line going to the origin in the Zijderveld diagrams. In general, maximum angular deviations were generally within low values. Some samples had univectorial behavior, while some showed two or three components. Most of the sections show normal and intermediate polarity directions far from the present GF, while reversed polarities were recorded at San Blas 2, La Serranita 1 and Punta Rubia 2 sites in San How to cite this paper: Nami, H. G.

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Section: Paleomagnetic Study Sampling Methods and Resultssupporting

confidence: 76%

Paleomagnetic Results from Archaeological Sites in Argentinean Patagonia: Evidence for the Holocene Geomagnetic Excursions in Southern South America and Its Chronostratigraphic Implications

Nami¹

2019

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The Blake Geomagnetic Field Event recorded in a sequence of marine and continental facies outcropping in the coast of Buenos Aires province, Argentina

Vizán

Azcuy

Tófalo

et al. 2019

Journal of South American Earth Sciences

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New evidence of an excursion of the geomagnetic field recorded in Late Pleistocene sediments in Argentina

Cited by 2 publications

References 10 publications

Paleomagnetic Results from Archaeological Sites in Argentinean Patagonia: Evidence for the Holocene Geomagnetic Excursions in Southern South America and Its Chronostratigraphic Implications

Paleomagnetic Results from Archaeological Sites in Argentinean Patagonia: Evidence for the Holocene Geomagnetic Excursions in Southern South America and Its Chronostratigraphic Implications

The Blake Geomagnetic Field Event recorded in a sequence of marine and continental facies outcropping in the coast of Buenos Aires province, Argentina

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