Obsidiana verde de los sitios arqueológicos en los alrededores del mar de Otway, Magallanes, Chile
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1991
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Artefactos y fragmentos trabajados en obsidiana, de colores característico verde-negro, se encuentran en cantidades importantes en sitios arqueológicos de canoeros en los alrededores de la región del mar de Otway y también, aunque en cantidades menores en los de cazadores terrestres de Magallanes. Los análisis químicos de obsidiana proveniente de cuatro yacimientos diferentes sugieren una fuente única para este vidrio volcánico hidratado de composición riolítica. Esta obsidiana verde es químicamente distinta de la obsidiana negra oscura que se encuentra en algunos de los sitios de cazadores terrestres. La obsidiana verde ha sido datada por técnicas de K-Ar en 17.1 m.a. Aunque la localidad específica de su fuente permanece desconocida, ésta debería provenir del cinturón volcánico del Mioceno medio que atraviesa los mares de Otway y Skyring en una línea que se extiende desde la isla Carlos III en el estrecho de Magallanes hacia las cordilleras Pinto, Paine y Baguales.
Artifacts and worked fragments ofa characteristically dark green-black to green obsidian are found in significant quantities in canoe Indian archaeological sites around the region of Seno Otway, and in lesser quantities in both canoe and foot Indian sites elsewhere in Magallanes. Chemical analysis of this obsidian from four different sites suggest a single source for this hydrated rhyolitic volcanic glass. This green obsidian is chemically distinct from jet black obsidian found in minor quantities in some foot Indian sites. The green obsidian has been dated by K-Ar techniques as 17.1 m.a. Although the specific location of its source remains unknown, it must be derived from the middle Miocene volcanic belt which runs through sound Otway and Skyring in a line from island Carlos III in the Straits of Magellan north to Cordilleras Pinto, Paine and Baguales.
Artifacts and worked fragments ofa characteristically dark green-black to green obsidian are found in significant quantities in canoe Indian archaeological sites around the region of Seno Otway, and in lesser quantities in both canoe and foot Indian sites elsewhere in Magallanes. Chemical analysis of this obsidian from four different sites suggest a single source for this hydrated rhyolitic volcanic glass. This green obsidian is chemically distinct from jet black obsidian found in minor quantities in some foot Indian sites. The green obsidian has been dated by K-Ar techniques as 17.1 m.a. Although the specific location of its source remains unknown, it must be derived from the middle Miocene volcanic belt which runs through sound Otway and Skyring in a line from island Carlos III in the Straits of Magellan north to Cordilleras Pinto, Paine and Baguales.
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Obsidiana verde, Artefactos de obsidiana, Yacimientos arqueológicos, Mar de Otway
Citación
Anales del Instituto de la Patagonia, Vol. 20, pp. 139-144, 1991.