Abstract

MORALES, Juan; GOGUITCHAICHVILI, Avto; SANCHEZ-BETUCCI, Leda  and  CAPDEPONT, Irina. Archaeomagnetic study of Holocene pottery produced by indigenous societies in Uruguay. Bol. Soc. Geol. Mex [online]. 2019, vol.71, n.2, pp.481-495.  Epub Oct 30, 2019. ISSN 1405-3322.  https://doi.org/10.18268/bsgm2019v71n2a15.

The study of well-dated archeological potsherds and heated structures (i.e. kilns, floors, etc.) yields the opportunity for a better knowledge of the geomagnetic field variations at archeological timescales. We present the first archeointensity results obtained on Uruguayan ceramics prepared by indigenous societies on the coast of the Uruguay River. Titanomagnetite with low Ti content seem to be the responsible for the remanence in these ceramic fragments, as inferred from the results obtained from continuous thermomagnetic and isothermal remanent magnetization acquisitions curves. Fifteen (~100 specimens) out of the twenty-two analyzed fragments produced reliable archeointensity estimates. Archeointensity determinations were obtained using the Thellier-Coe method, while the corresponding archeointensity dates by using the dating arqueo_dating tool. Obtained archeointensities from the total of the analyzed samples vary between 23.3 ± 1.4 μT and 42.9 ± 2.4 μT, and correspond to ages between 1660 BC and 1660 AD. These ages are consistent with 14C dates previously reported in the area.

Keywords : Indigenous societies of the Uruguay; Holocene; Geomagnetic Archeointensity; Archeomagnetic dating.

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