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Search Results: 1 - 10 of 8292 matches for " ISABEL; CHARLIN "
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Obsidiana gris porfírica calco-alcalina del volcán Chaitén en sitios arqueológicos al sur del río Santa Cruz, Patagonoa meridional
STERN,CHARLES R; CARACOTCHE,SOLEDAD; CRUZ,ISABEL; CHARLIN,JUDITH;
Magallania (Punta Arenas) , 2012, DOI: 10.4067/S0718-22442012000100008
Abstract: one core and two fakes of porphyritic grey rhyolite obsidian from parque nacional monte león and the pali aike volcanic feld are chemically different than the more common black, banded grey-green and green obsidian types previously described from this area of southernmost patagonia. this porphyritic grey obsidian has higher concentrations of sr and ba and lower concentrations of zr, y, nb, th, hf and yb than these other three obsidian types. in these respects this obsidian resembles calc-alkaline rhyolite from andean volcanoes rather than the peralkaline rhyolite associated with patagonian back-arc basaltic plateau volcanism. however, this porphyritic grey obsidian has low sr/y (<20) and is chemically distinct from the adakitic (sr/y >30) erupted from volcanoes in the austral volcanic zone (49-54°s) of the southernmost andes, located directly to the west of monte león and pali aike. furthermore, no rhyolite obsidian has ever been identifed in these austral volcanoes. instead, these samples of porphyritic grey obsidian have visual and chemical similarities to porphyritic grey obsidian from the chaitén volcano (42°50’s) located over 1100 km to the northwest.
Obsidiana gris porfírica calco-alcalina del volcán Chaitén en sitios arqueológicos al sur del río Santa Cruz, Patagonoa meridional Porphyritic grey calc-alkaline obsidian from Chaitén volcano in archaeological sites south of the Santa Crus river, southermost Patagonia
CHARLES R STERN,SOLEDAD CARACOTCHE,ISABEL CRUZ,JUDITH CHARLIN
Magallania , 2012,
Abstract: En el Parque Nacional Monte León y el Campo Volcánico Pali Aike se han recuperado un núcleo y dos lascas de obsidiana gris porfírica riolítica, la cual es químicamente diferente a los tipos más comunes de obsidianas (negra, gris verdosa veteada y verde) descritos para esta área del sur de Patagonia. Esta obsidiana gris porfírica tiene mayores concentraciones de Sr y Ba y menores concentraciones de Zr, y, Nb, Th, Hf y yb que los otros tres tipos de obsidiana. En estos aspectos, esta obsidiana se asemeja más a las riolitas calco-alcalinas de volcanes andinos que a las riolitas peralcalinas asociadas con el vulcanismo de retroarco de las mesetas basálticas de Patagonia. Sin embargo, esta obsidiana gris porfírica tiene baja Sr/y (<20) y es químicamente diferente de las adakitas (Sr/y >30) emitidas por los volcanes de la Zona Volcánica Austral (49-54°S) en el extremo sur de los Andes, ubicada directamente al oeste de Monte León y Pali Aike. Además, hasta la fecha no se ha identificado obsidiana riolítica en estos volcanes australes. Por otra parte, estas muestras de obsidiana gris porfírica tienen similitudes visuales y químicas con la obsidiana gris porfírica del Volcán Chaitén (42°50’S) situado a más de 1100 km al noroeste. One core and two fakes of porphyritic grey rhyolite obsidian from Parque Nacional Monte León and the Pali Aike volcanic feld are chemically different than the more common black, banded grey-green and green obsidian types previously described from this area of southernmost Patagonia. This porphyritic grey obsidian has higher concentrations of Sr and Ba and lower concentrations of Zr, y, Nb, Th, Hf and yb than these other three obsidian types. In these respects this obsidian resembles calc-alkaline rhyolite from Andean volcanoes rather than the peralkaline rhyolite associated with Patagonian back-arc basaltic plateau volcanism. However, this porphyritic grey obsidian has low Sr/y (<20) and is chemically distinct from the adakitic (Sr/y >30) erupted from volcanoes in the Austral Volcanic Zone (49-54°S) of the southernmost Andes, located directly to the west of Monte León and Pali Aike. Furthermore, no rhyolite obsidian has ever been identifed in these austral volcanoes. Instead, these samples of porphyritic grey obsidian have visual and chemical similarities to porphyritic grey obsidian from the Chaitén volcano (42°50’S) located over 1100 km to the northwest.
Explorando la intensidad de uso de las materias primas líticas en Pali Aike (provincia de Santa Cruz, Argentina)
Charlin,Judith;
Intersecciones en antropolog?-a , 2007,
Abstract: the main goal of this paper is to evaluate the intensity of human utilization of lithic raw materials in pali aike (southern santa cruz province, argentina). the sample includes artifacts unifacially retouched and/or with macroscopic edge-wear damage from different late holocene localities within pali aike. the variables considered include the length of the artifacts, fragmentation, amount of retouched and/or wear damaged edges and/or points by artifact, percentage of cortex, and resharpening. the results show that some variables point to differences in the intensity of exploitation of different raw materials, while others are not sensitive to this variation.
Explorando la intensidad de uso de las materias primas líticas en Pali Aike (provincia de Santa Cruz, Argentina) Exploring the reduction intensity of lithic raw materials in Pali Aike (Santa Cruz province, Argentina)
Judith Charlin
Intersecciones en Antropología , 2007,
Abstract: El objetivo general del presente trabajo es evaluar la intensidad de uso a la que estuvieron sujetas las materias primas líticas utilizadas en la manufactura de artefactos en Pali Aike (sector meridional de la provincia de Santa Cruz, Argentina). La muestra analizada comprende artefactos tallados de formatización unifacial y/o con rastros complementarios que fueron recuperados en diversas localidades del campo volcánico con ocupaciones asignadas al Holoceno tardío. Diversas variables son consideradas como indicadores de la intensidad de uso o grado de reducción de las rocas, tales como la longitud de los artefactos al momento del descarte, el grado de fragmentación de los mismos, el porcentaje de corteza que conservan, la cantidad de filos y/o puntas formatizados y/o con rastros complementarios por artefacto, el ángulo de desgaste y la reactivación de los filos y/o puntas. Los resultados obtenidos se alan la existencia de diferencias en la explotación y aprovechamiento de las materias primas líticas en algunas de estas variables, en tanto que otras no ofrecen un comportamiento diferencial o simplemente no resultan sensitivas a estos factores. The main goal of this paper is to evaluate the intensity of human utilization of lithic raw materials in Pali Aike (southern Santa Cruz Province, Argentina). The sample includes artifacts unifacially retouched and/or with macroscopic edge-wear damage from different Late Holocene localities within Pali Aike. The variables considered include the length of the artifacts, fragmentation, amount of retouched and/or wear damaged edges and/or points by artifact, percentage of cortex, and resharpening. The results show that some variables point to differences in the intensity of exploitation of different raw materials, while others are not sensitive to this variation.
Summative assessment of 5th year medical students’ clinical reasoning by script concordance test: requirements and challenges
Paul Duggan, Bernard Charlin
BMC Medical Education , 2012, DOI: 10.1186/1472-6920-12-29
Abstract: A 51 case, 158-question, multidisciplinary paper was constructed to assess clinical reasoning in 5th-year. 10–16 experts in each of 7 discipline-based reference panels answered questions on-line. A multidisciplinary group considered reference panel data and data from a volunteer group of 6th Years, who sat the same test, to determine the passing score for the 5th Years.The mean (SD) scores were 63.6 (7.6) and 68.6 (4.8) for the 6th Year (n?=?23, alpha?=?0.78) and and 5th Year (n?=?132, alpha =0.62) groups (p?<?0.05), respectively. The passing score was set at 4 SD from the expert mean. Four students failed.The SCT may be a useful method to assess clinical reasoning in medical students in multidisciplinary summative assessments. Substantial investment in training of faculty and students and in the development of questions is required.
A más de 30 a?os: otra mirada a la tecnología lítica de Las Buitreras 1 (cuenca del río Gallegos, Santa Cruz)
Charlin,Judith E.;
Intersecciones en antropolog?-a , 2009,
Abstract: this article is a re-examination of the lithic artifacts of las buitreras 1 cave, güer aike departament, santa cruz province, focused on the explotation of lithic raw materials for the manufacture of artifacts. the procurement strategies for rocks at the site are also discussed. the sample includes lithics from layers iv to i, which correspond to the last 4000 years bp. the explotation of nearby lithic raw materials, the predominance of tools/debris, the scarcity of primary and secondary flakes/debris, the small size of flakes and the reutilization of blanks, suggest a low investment in the procurement of rocks and the manufacture of artifacts. these results agree with the previously proposed marginal land-use model of the gallegos river basin during the late holocene.
Materias primas líticas y uso del espacio en las nacientes del Río Gallegos: el caso de Laguna Cóndor (Estancia Glencross, Santa Cruz, Argentina)
CHARLIN,JUDITH E;
Magallania (Punta Arenas) , 2012, DOI: 10.4067/S0718-22442012000100010
Abstract: the analysis of stone tool from the surface of laguna cóndor (estancia glencross, santa cruz, argentina), located in the upper basin of the gallegos river, in an area known as los morros, is presented. the methodology applied, denominated minimun analitical nodules analysis (larson y kornfel 1997), has the advantage of grouping the artifacts and ecofacts by rock nodule, which is more useful than clustering them by class or type of lithic raw material. this method allows us to doing a major resolution analysis and a more detailed quantification. the results shown the predominance of nodules represen-ted by only one piece of debitage, in some cases in non-local raw materials, and by sets of debitage in immediately available lithic raw materials. according to the organization models proposed as framework to this methodology, the results point out, at frst, the resharpening of tools manufactured and discarded in another place and with a minor rate, in situ manufacture and maintenance of tools, removed of the site and transported far away. this pattern, together with other lines of evidences, suggests a logistic landscape use, at least in historic times, according to the available radiocarbon dating.
ANáLISIS COMPARATIVO DE NúCLEOS PROCEDENTES DEL EXTREMO SUR DE PATAGONIA CONTINENTAL (REP. ARGENTINA): MATERIAS PRIMAS Y TéCNICAS DE REDUCCIóN
CHARLIN,JUDITH; CARDILLO,MARCELO;
Magallania (Punta Arenas) , 2005, DOI: 10.4067/S0718-22442005000200005
Abstract: the main goal of this contribution is to study the use strategies of lithic raw material in the southern portion of the santa cruz province, argentina. we compare samples from lithic cores collected at a variety of locales in the pali aike lava field and in the coastal area of ca?adón gap. in order to evaluate possible differences and similarities, we use both qualitative and quantitative analysis. our results show similarity in coastal and hinterland strategies of lithic raw material exploitation. we evaluate this information in relation to other lines of regional evidence, and consider its implications for discussions of the home ranges of human populations
ANáLISIS COMPARATIVO DE NúCLEOS PROCEDENTES DEL EXTREMO SUR DE PATAGONIA CONTINENTAL (REP. ARGENTINA): MATERIAS PRIMAS Y TéCNICAS DE REDUCCIóN COMPARATIVE ANALYSIS OF LITHIC CORES FROM SOUTHERN PATAGONIA: RAW MATERIALS AND REDUCTION TECHNIQUES
JUDITH CHARLIN,MARCELO CARDILLO
Magallania , 2005,
Abstract: El objetivo central de este trabajo es el estudio de las estrategias de utilización de las materias primas líticas en el sector meridional de la Provincia de Santa Cruz, República Argentina. Se comparan muestras de núcleos recuperados en diversas localidades dentro del campo volcánico Pali Aike y de la zona costera de Ca adón Gap. Con el fin de evaluar posibles diferencias y similitudes entre los conjuntos se realizaron análisis tanto cualitativos como cuantitativos. Los resultados obtenidos sugieren homogeneidad en las estrategias de explotación de los recursos líticos tanto en la zona costera como en el interior. Los datos obtenidos se discuten en el marco de la información ya existente para el área, en términos de rango de acción de las poblaciones humanas. The main goal of this contribution is to study the use strategies of lithic raw material in the southern portion of the Santa Cruz province, Argentina. We compare samples from lithic cores collected at a variety of locales in the Pali Aike Lava Field and in the coastal area of Ca adón Gap. In order to evaluate possible differences and similarities, we use both qualitative and quantitative analysis. Our results show similarity in coastal and hinterland strategies of lithic raw material exploitation. We evaluate this information in relation to other lines of regional evidence, and consider its implications for discussions of the home ranges of human populations
Materias primas líticas y uso del espacio en las nacientes del Río Gallegos: el caso de Laguna Cóndor (Estancia Glencross, Santa Cruz, Argentina) Lithic raw materials and landscape use in the upper Gallegos River: The case of Laguna Cóndor, (Estancia Glencross, Santa Cruz, Argentina)
JUDITH E CHARLIN
Magallania , 2012,
Abstract: Se presenta el análisis de los materiales líticos de superficie recuperados en la margen noreste de la laguna Cóndor (Estancia Glencross, Santa Cruz, Argentina), localizada en las nacientes del río Gallegos, en un área conocida localmente como los Morros. La metodología implementada, denominada Minimun Analitical Nodules Analysis (Larson y Kornfel 1997), permite agrupar los artefactos y ecofactos por nódulo de roca, lo cual posibilita un análisis de mayor resolución y una cuantificación más precisa de las materias primas líticas explotadas que la agrupación genérica por clase o tipo de roca. Los resultados alcanzados muestran el predominio de nódulos representados por un desecho aislado, en muchos casos en materias primas no-locales, y por conjuntos de desechos en materias primas disponibles en la inmediata vecindad. De acuerdo con los modelos de organización tecnológica propuestos como marco de esta metodología de análisis, los resultados indican, en primer lugar, la reactivación de instrumentos manufacturados y descartados en otro lado que transitaron por el sitio y, en menor proporción, la manufactura y mantenimiento de artefactos in situ que fueron transportados fuera del sitio. Este patrón, junto con otras evidencias, sugieren un uso logístico de este sector del espacio, al menos en momentos históricos, según las dataciones radiocarbónicas disponibles hasta la fecha. The analysis of stone tool from the surface of laguna Cóndor (Estancia Glencross, Santa Cruz, Argentina), located in the upper basin of the Gallegos river, in an area known as los Morros, is presented. The methodology applied, denominated Minimun Analitical Nodules Analysis (Larson y Kornfel 1997), has the advantage of grouping the artifacts and ecofacts by rock nodule, which is more useful than clustering them by class or type of lithic raw material. This method allows us to doing a major resolution analysis and a more detailed quantification. The results shown the predominance of nodules represen-ted by only one piece of debitage, in some cases in non-local raw materials, and by sets of debitage in immediately available lithic raw materials. According to the organization models proposed as framework to this methodology, the results point out, at frst, the resharpening of tools manufactured and discarded in another place and with a minor rate, in situ manufacture and maintenance of tools, removed of the site and transported far away. This pattern, together with other lines of evidences, suggests a logistic landscape use, at least in historic times, according to the available radiocarb
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