Obsidiana gris verdosa veteada de la cuenca superior del río Santa Cruz, extremo sur de Patagonia
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2000
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Artefactos y fragmentos de obsidiana gris verdosa veteada se han recuperado en sitios arqueológicos a lo largo del borde meridional y oriental de lago Argentino, en la cuenca superior del río Santa Cruz, Argentina, como así también en sitios ubicados aproximadamente 250 km hacia al este, cerca de la costa atlántica, tales como las cuevas Fell y Pali Aike, en Magallanes, Chile. Esta obsidiana riolítica libre de cristales es a la vez visualmente y químicamente distinta tanto de la
obsidiana verde encontrada en una gran abundancia al sur, alrededor del mar de Otway, Magallanes, Chile, como de la obsidiana negra de la región de Pampa del Asador, Argentina, al norte. Se determinó que esta obsidiana tenia una edad '40Ar-39Ar de 2,3 Ma, similar a las edades de los basaltos de la meseta de las Vizcachas y de la cordillera Baguales, lo cual, junto con su distribución espacial, sugiere una fuente asociada con las lavas de las mesetas basálticas de la porción sur de la cuenca superior del río Santa Cruz.
Artifacts and fragments of banded grey-green obsidian occur in archaeological sites along the southern and eastern margin of Lago Argentino in the upper Santa Cruz River basin, Argentina, as well as in sites approximately 250 km to the east near the atlantic coast such as Pali Aike and Fell's Cave in Magallanes, Chile. This crystal-free rhyolite obsidian is both visually and chemically distinct from green obsidian found in high abundance to the south around Seno Otway, Magallanes, Chile, and black obsidian from the regióon of Pampa del Asador, Argentina,to the north. An 40Ar-39Ar age of 2.3 Ma, similar to the age of Meseta Vizcachas and cordillera Baguales basalts, was determined for this obsidian, which together with its spatial distribution suggests a source associated with the basaltic plateau lavas of the southern portion of the upper Santa Cruz River basin.
Artifacts and fragments of banded grey-green obsidian occur in archaeological sites along the southern and eastern margin of Lago Argentino in the upper Santa Cruz River basin, Argentina, as well as in sites approximately 250 km to the east near the atlantic coast such as Pali Aike and Fell's Cave in Magallanes, Chile. This crystal-free rhyolite obsidian is both visually and chemically distinct from green obsidian found in high abundance to the south around Seno Otway, Magallanes, Chile, and black obsidian from the regióon of Pampa del Asador, Argentina,to the north. An 40Ar-39Ar age of 2.3 Ma, similar to the age of Meseta Vizcachas and cordillera Baguales basalts, was determined for this obsidian, which together with its spatial distribution suggests a source associated with the basaltic plateau lavas of the southern portion of the upper Santa Cruz River basin.
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Obsidiana gris-verdosa, Material lítico, Obsidiana riolítica
Citación
Anales del Instituto de la Patagonia, Vol. 28, pp. 265-273, 2000.