Obsidians circulation and use in the northern coast of San Jorge Gulf (Chubut province, Argentina) during the Late Holocene: first results

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This paper presents the results of the geochemical (ED-XRF) and technological analysis of 21 obsidian artifacts from the north coast of San Jorge Gulf. Five chemical groups representing four different secondary sources located between 435 and 280 km away from the study area were identified. Three so...

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Autores principales: Banegas, Anahi, Gómez Otero, Julieta, Pérez, Alberto Enrique
Formato: Artículo revista
Lenguaje:Español
Publicado: Instituto de Arqueología, Facultad de Filosofía y Letras, Universidad de Buenos Aires 2021
Materias:
Patagonian coast
Alloctonous rock
Sources
Geochemical analyses (or ED-XRF analysis)
Costa de Patagonia
Roca alóctona
Fuentes de aprovisionamiento
Análisis geoquímico (o análisis ED-XRF)
Acceso en línea:http://revistascientificas.filo.uba.ar/index.php/Arqueologia/article/view/7652
Aporte de:
Arqueología de Universidad de Buenos Aires
id I28-R243-article-7652
record_format ojs
spelling I28-R243-article-76522023-11-08T12:06:50Z Obsidians circulation and use in the northern coast of San Jorge Gulf (Chubut province, Argentina) during the Late Holocene: first results Circulación y uso de obsidianas en la costa norte del golfo San Jorge (provincia de Chubut, Argentina) durante el Holoceno tardío: primeros resultados Banegas, Anahi Gómez Otero, Julieta Pérez, Alberto Enrique Patagonian coast Alloctonous rock Sources Geochemical analyses (or ED-XRF analysis) Costa de Patagonia Roca alóctona Fuentes de aprovisionamiento Análisis geoquímico (o análisis ED-XRF) This paper presents the results of the geochemical (ED-XRF) and technological analysis of 21 obsidian artifacts from the north coast of San Jorge Gulf. Five chemical groups representing four different secondary sources located between 435 and 280 km away from the study area were identified. Three sources have a known location: Pampa del Asador (PSA1) to the South, and Sacanana (S1) and Telsen/Sierra Negra (T/SN 1 y T/SN2) to the North. The fourth, Meseta de Somuncurá (MS), still unknown, is probably also located to the North. Two radiocarbon dates –1950 14C AP and 1640 14C AP– indicate that obsidians circulated at least since the Late Holocene. In the lithic samples, obsidians present low frequency, in contrast to the abundant local rocks (silica, petrified wood, and chalcedony), of excellent flaking quality. Artifacts are mainly small, half of them preserve the cortex, and flakes are slightly more frequent than blades. Artifacts include debris, tools, and one core. Evidence suggests the exploitation of small pebbles and the presence of all the lithic production stages at the sites. These results are discussed and compared with those of other obsidian assemblages from central Argentinian Patagonia. En este trabajo se presentan los resultados del análisis físico-químico (ED-XRF) y tecnológico de 21 artefactos de obsidiana procedentes de la costa norte del golfo San Jorge. Se identificaron cinco grupos químicos correspondientes a cuatro fuentes secundarias distantes entre 435 y 280 km del área. Tres fuentes son de localización conocida: Pampa del Asador (PDA1) al Sur, y Sacanana (S1) y Telsen/Sierra Negra (grupos T/SN1 y T/SN2), al Norte. La cuarta, Meseta de Somuncurá (MS), aún desconocida, estaría también ubicada al Norte. Dos dataciones radiocarbónicas —1950 14C AP y 1640 14C AP— señalan el uso de esta roca desde por lo menos el Holoceno tardío. En los muestreos líticos las obsidianas muestran baja frecuencia, en contraste con las abundantes materias primas locales (sílices, xilópalos y calcedonias), de excelente calidad para la talla. Predominan los artefactos pequeños, la mitad presenta reserva de corteza y las lascas superan levemente a las láminas. Los grupos tipológicos están representados por desechos, instrumentos y un núcleo. Se interpreta la explotación de rodados chicos y la ejecución in situ de todas las etapas de la reducción lítica. Se comparan y discuten estos resultados con los de otros muestreos de obsidianas de Patagonia central argentina. Instituto de Arqueología, Facultad de Filosofía y Letras, Universidad de Buenos Aires 2021-04-02 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion application/pdf http://revistascientificas.filo.uba.ar/index.php/Arqueologia/article/view/7652 10.34096/arqueologia.t27.n1.7652 Arqueología; Vol. 27 Núm. 1 (2021): enero-abril; 193-206 Arqueología; Vol 27 No 1 (2021): January-April; 193-206 1853-8126 0327-5159 spa http://revistascientificas.filo.uba.ar/index.php/Arqueologia/article/view/7652/8744 Derechos de autor 2021 Anahi Banegas, Julieta Gómez Otero, Alberto Enrique Pérez https://creativecommons.org/licenses/by-nc-sa/4.0
institution Universidad de Buenos Aires
institution_str I-28
repository_str R-243
container_title_str Arqueología
language Español
format Artículo revista
topic Patagonian coast
Alloctonous rock
Sources
Geochemical analyses (or ED-XRF analysis)
Costa de Patagonia
Roca alóctona
Fuentes de aprovisionamiento
Análisis geoquímico (o análisis ED-XRF)
spellingShingle Patagonian coast
Alloctonous rock
Sources
Geochemical analyses (or ED-XRF analysis)
Costa de Patagonia
Roca alóctona
Fuentes de aprovisionamiento
Análisis geoquímico (o análisis ED-XRF)
Banegas, Anahi
Gómez Otero, Julieta
Pérez, Alberto Enrique
Obsidians circulation and use in the northern coast of San Jorge Gulf (Chubut province, Argentina) during the Late Holocene: first results
topic_facet Patagonian coast
Alloctonous rock
Sources
Geochemical analyses (or ED-XRF analysis)
Costa de Patagonia
Roca alóctona
Fuentes de aprovisionamiento
Análisis geoquímico (o análisis ED-XRF)
author Banegas, Anahi
Gómez Otero, Julieta
Pérez, Alberto Enrique
author_facet Banegas, Anahi
Gómez Otero, Julieta
Pérez, Alberto Enrique
author_sort Banegas, Anahi
title Obsidians circulation and use in the northern coast of San Jorge Gulf (Chubut province, Argentina) during the Late Holocene: first results
title_short Obsidians circulation and use in the northern coast of San Jorge Gulf (Chubut province, Argentina) during the Late Holocene: first results
title_full Obsidians circulation and use in the northern coast of San Jorge Gulf (Chubut province, Argentina) during the Late Holocene: first results
title_fullStr Obsidians circulation and use in the northern coast of San Jorge Gulf (Chubut province, Argentina) during the Late Holocene: first results
title_full_unstemmed Obsidians circulation and use in the northern coast of San Jorge Gulf (Chubut province, Argentina) during the Late Holocene: first results
title_sort obsidians circulation and use in the northern coast of san jorge gulf (chubut province, argentina) during the late holocene: first results
description This paper presents the results of the geochemical (ED-XRF) and technological analysis of 21 obsidian artifacts from the north coast of San Jorge Gulf. Five chemical groups representing four different secondary sources located between 435 and 280 km away from the study area were identified. Three sources have a known location: Pampa del Asador (PSA1) to the South, and Sacanana (S1) and Telsen/Sierra Negra (T/SN 1 y T/SN2) to the North. The fourth, Meseta de Somuncurá (MS), still unknown, is probably also located to the North. Two radiocarbon dates –1950 14C AP and 1640 14C AP– indicate that obsidians circulated at least since the Late Holocene. In the lithic samples, obsidians present low frequency, in contrast to the abundant local rocks (silica, petrified wood, and chalcedony), of excellent flaking quality. Artifacts are mainly small, half of them preserve the cortex, and flakes are slightly more frequent than blades. Artifacts include debris, tools, and one core. Evidence suggests the exploitation of small pebbles and the presence of all the lithic production stages at the sites. These results are discussed and compared with those of other obsidian assemblages from central Argentinian Patagonia.
publisher Instituto de Arqueología, Facultad de Filosofía y Letras, Universidad de Buenos Aires
publishDate 2021
url http://revistascientificas.filo.uba.ar/index.php/Arqueologia/article/view/7652
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first_indexed 2023-06-27T20:53:13Z
last_indexed 2023-11-08T21:46:50Z
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