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espanolEl valle de Tafi es una pequena cuenca intermontana de las Sierras Pampeanas del Noroeste Argentino. Los estudios geomorfologicos efectuados han permitido reconocer la existencia de registros morfosedimentarios del Holoceno de gran interes para la reconstruccion paleoambiental regional. El estudio de las principales acumulaciones de laderas, terrazas fluviales y conos aluviales aporto numerosos registros geoarqueologicos, restos paleontologicos, cenizas volcanicas, asi como dataciones 14C y de termoluminiscencia, de interes para elaborar una secuencia paleoambiental. Estos datos, junto a antecedentes y la elaboracion de cartografia geomorfologica permiten diferenciar 4 unidades morfosedimentarias. La etapa mas antigua (H1) comprende el Holoceno inferior y medio (ca. 13000-ca. 4200 BP) subdividida en dos subunidades (H1a y H1b), de diferente signo ambiental, separadas por un evento volcanico (V0) datado en ca. 10000 BP. El final de H1b queda delimitado por otro aporte de tefras en ca. 4200 BP, cuando esta unidad comenzaba a quedar individualizada por una fase de incision. La etapa H2 abarca desde ca. 4200 BP hasta ca. 630 BP alcanzando notable extension en el valle. La presencia de ocupacion humana durante este periodo (Culturas Tafi y Santa Maria) y las caracteristicas de los sedimentos indican una gran influencia de la accion antropica en su formacion. Finalmente, dos unidades menores (H3 y H4) cubren los ultimos siglos de la secuencia holocena, separadas por fases de incision intermedias. Los datos del conjunto holoceno han sido puestos en relacion con la evolucion paleoclimatica regional e integrados en los principales eventos de caracter global. EnglishThe Tafi Valley is a small basin located in the northern sector of the Sierras Pampeanas in Northwest Argentina. The geomorphological studies made in the area showed the presence of very representative Holocene morpho-sedimentary records, which are useful for regional paleoenvironmental reconstruction. The study of the main slope accumulations, fluvial terraces, and alluvial fans provided several geoarchaeological records, paleontological remains, and volcanic ash layers as well as radiocarbon and thermoluminescence datings. We used all these data to construct a paleoenvironmental sequence. This sequence was also accompanied by some previously obtained data and detailed geomorphological cartography. Four morphosedimentary units were identified. The oldest unit (H1) comprises the Early and Middle Holocene (ca. 13000 - ca. 4200 BP). It could be divided into two sub-stages (H1a and H1b), with different environmental signs. They appear separated by a tephra layer (V0) dated ca. 10000 BP. The end of sub-stage H1b is limited by another ash layer (V1) dated ca. 4200 BP. By that time, an incision process had already started separating this substage from the next one. Stage H2 spans from ca. 4200 BP to ca. 630 BP, and extends vastly throughout the valley. It was possible to identify several features of human settlements (Tafi and Santa Maria Cultures) corresponding to that period. The characteristics of the sediments indicate a strong anthropogenic influence during its formation. Finally, two minor units (H3 and H4) cover the last centuries of the Holocene sequence, separated by incision phases. The Holocene set was related to the regional and global paleoclimatic evolution.

Holocene paleoenvironments from the Tafí Valley (northwest Argentina) through morpho-sedimentary and geoarchaeological record analyses.