Resumo

OZAN, Ivana Laura  e  ORGEIRA, María Julia. Propiedades magnéticas y micromorfología de suelos en el sitio arqueológico Marazzi 2, Isla Grande de Tierra del Fuego, Chile. Rev. Asoc. Geol. Argent. [online]. 2015, vol.72, n.2, pp.251-264. ISSN 0004-4822.

The aim of the present work is to get an insight into the origin of the magnetic signature (natural and/or anthropogenic) of archaeological deposits and its relation to soil micromorphology. For this purpose, two profiles were sampled from the Late Holocene archaeological site Marazzi 2, located in northwestern Isla Grande de Tierra del Fuego (Chile). The P1 profile shows a magnetic signature peak (due to magnetite and/or titanomagnetite) between 30 - 70 cm depth, which coincides with Ab and ABb soil horizons for which intense anthropic activity (including combustion) was recorded. It is states that the anthropogenic activity is the main cause of that enrichment. The P2 profile exhibits a peak in the coercivity of remanence parameter between 20 - 40 cm depth (due to hematite) which coincides with few anthropogenic components and an AB soil horizon. The record of “red pigments” (carried by past-human populations) in a surrounded excavation could explain the increment of this parameter. The study highlights that soil micromorphology can help in the understanding of the processes that affect the magnetic properties of soils and paleosols.

Palavras-chave : Magnetic parameters; Soil micromorphology; Pedogenesis; Anthropogenic combustion; Hunter-gatherers.

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