scholarly journals Arqueometria e o sítio arqueológico Pedra do Cantagalo I: uma estratégia de investigação como modelo para a América do Sul

2018 ◽  
Vol 15 (30) ◽  
pp. 315
Author(s):  
Luis Carlos Duarte Cavalcante
Keyword(s):  
Mass Spectrometry ◽  
Accelerator Mass Spectrometry ◽  
Archaeological Site ◽  
Ceramic Materials ◽  
Before Present ◽  
Mineralogical Characterization ◽  
Analytical Strategies ◽  
Physical Examinations ◽  
Investigative Techniques

A Pedra do Cantagalo I é um sítio arqueológico localizado na área rural do município de Piripiri, estado do Piauí, Brasil. Consiste em um abrigo sob-rocha arenítica, cujas saliências e reentrâncias estão decoradas com mais de 1.950 pinturas rupestres representando figuras abstratas, propulsores de dardos, carimbos de mãos humanas, antropomorfos e zoomorfos, realizados em padrões policromáticos. Além da elevada densidade de inscrições pré-históricas e da policromia, esse sítio também se destaca pela recorrência dos motivos pintados e pela sobreposição deles entre si. Nos sedimentos superficiais foram encontrados fragmentos cerâmicos, líticos e ocres. Carvões residuais encontrados em fogueiras bem estruturadas, evidenciadas em recentes escavações neste abrigo, foram datados pelo método do 14C como sendo de 1.180 ± 30 anos antes do presente; em estratigrafia também foram evidenciados materiais cerâmicos, líticos e ocres vermelhos e amarelos. Neste artigo são reportadas as estratégias analíticas de campo e de laboratório utilizadas na investigação desse importante sítio arqueológico e dos testemunhos de atividade humana pré-histórica nele existentes ou dele coletados. Os exames físicos, a caracterização químico-mineralógica dos materiais, o monitoramento das condições ambientais e as prospecções no entorno foram primordiais. Abstract: Pedra do Cantagalo I is an archaeological site located in the rural area of the municipality of Piripiri, Piauí state, Brazil. It consists of a sandstone shelter decorated with more than 1,950 rupestrian paintings representing abstract figures, spear-throwers, human handprints, and anthropomorphic and zoomorphic figures in polychromatic patterns. In addition to the high density of prehistoric inscriptions and polychrome paintings, this site also stands out due to the recurrence of painted motifs and to the overlapping of the paintings. Ceramic materials, lithics, and ochres were found in the sediments. Residual charcoals found in remnants of well-structured hearths, as recently evidenced from excavations in this shelter were AMS (accelerator mass spectrometry) 14C-dated as being from 1,180 ± 30 years before present; in stratigraphy, ceramic materials, lithics, and red and yellow ochres were also evidenced. In this paper, the field and laboratory analytical strategies used in the investigation of this important archaeological site are reports as well as the evidence of prehistoric human activity contained within or collected from the site. The investigative techniques included physical examinations of the site, chemical-mineralogical characterization of the materials, monitoring of the environmental conditions and prospections in nearby areas.

Reconstructing the Chronology of the House XVII-XVIII Complex at Umm el-Jimal, East Jordan: Radiocarbon Dates of Organic Inclusions of Architectural Mortars

Radiocarbon ◽  
2014 ◽  
Vol 56 (1) ◽  
pp. 245-256 ◽  
Author(s):  
Khaled Al-Bashaireh
Keyword(s):  
Mass Spectrometry ◽  
Accelerator Mass Spectrometry ◽  
Archaeological Site ◽  
Housing Demand ◽  
Radiocarbon Dates ◽  
Archaeological Data ◽  
Lime Mortars ◽  
Byzantine Period

This article presents accelerator mass spectrometry (AMS) radiocarbon dates of organic inclusions of cement materials from the House XVII-XVIII Complex located in the Umm el-Jimal archaeological site, east Jordan, aiming at refining the unclear chronology of the house. Fine straws and small fragments of charcoal uncovered from preserved architectural lime mortars and plasters were dated without carrying out extensive excavations. The results indicate that the house most probably was initially plastered or built during the middle of the Byzantine period. The results agree with the historical and archaeological data indicating that Umm el-Jimal flourished during this period; therefore, it is probable that the house was established during this time to meet the housing demand for the increased number of its population.

scholarly journals Cazadores recolectores tempranos, supervivencia de fauna del pleistoceno (equus sp. y glyptodon sp.) y tecnologia lítica durante el holoceno temprano en la frontera Uruguay-Brasil

2010 ◽  
Vol 23 (2) ◽  
pp. 20-39 ◽  
Author(s):  
Rafael Suárez ◽  
Guaciara M. Santos
Keyword(s):  
Climate Change ◽  
Mass Spectrometry ◽  
South America ◽  
Accelerator Mass Spectrometry ◽  
Lithic Technology ◽  
Archaeological Site ◽  
Human Adaptation ◽  
14C Age ◽  
Lithic Artifacts ◽  
In The Beginning

On this paper we show records of Pleistocene fauna from the archaeological site of PayPaso 1, located near of the Quarai River. On this site we recovered two extinct species, Equus sp. (ancient horse) e Glyptodon sp. (giant armadillo), direct associated with lithic artifacts. Our results indicate that these extinct mammals lived in the beginning of the Holocene (9,600 – 9,100 years 14C BP), based on nine 14C age results obtained by AMS (Accelerator Mass Spectrometry) measurements. In this work, these results are compared with others in South America. Human adaptation, lithic technology, Pleistocene fauna extinction and climate change at the transition between Pleistocene-Holocene are also discussed.

scholarly journals Radiocarbon in 9th to 5th Century BC Tree-Ring Samples from the Ouban 1 Archaeological Site, Hiroshima, Japan

Radiocarbon ◽  
2007 ◽  
Vol 49 (2) ◽  
pp. 473-479 ◽  
Author(s):  
Hiromasa Ozaki ◽  
Mineo Imamura ◽  
Hiroyuki Matsuzaki ◽  
Takumi Mitsutani
Keyword(s):  
Mass Spectrometry ◽  
Tree Ring ◽  
Calibration Curve ◽  
Accelerator Mass Spectrometry ◽  
Wood Sample ◽  
Archaeological Site ◽  
Short Term ◽  
Statistical Errors ◽  
Term Fluctuation

In order to investigate the regional atmospheric radiocarbon offset, accelerator mass spectrometry (AMS) 14C measurements were made on 5-yr increments of a Japanese wood sample dendrochronologically dated to 820–436 BC. The 14C data from the Japanese tree-ring samples were compared with the IntCal04 calibration curve (Reimer et al. 2004). In most parts, the differences between IntCal04 and 14C dates in the Japanese tree-ring samples were within experimental statistical errors. At around 680 BC, however, significant differences of up to 100 14C yr were observed. These differences may indicate either regional offsets in Japan or the short-term fluctuation of a subdecadal timescale in atmospheric 14C variations.

scholarly journals Production and characterization of 60Fe standards for accelerator mass spectrometry

PLoS ONE ◽  
2019 ◽  
Vol 14 (6) ◽  
pp. e0219039 ◽  
Author(s):  
Dorothea Schumann ◽  
Niko Kivel ◽  
Rugard Dressler
Keyword(s):  
Mass Spectrometry ◽  
Accelerator Mass Spectrometry

Study of the dehydroxylation of kaolinite and alunite from a Mexican clay with DRIFTS-MS

Clay Minerals ◽  
2016 ◽  
Vol 51 (1) ◽  
pp. 55-68 ◽  
Author(s):  
N.R. Osornio-Rubio ◽  
J.A. Torres-Ochoa ◽  
M.L. Palma-Tirado ◽  
H. Jiménez-Islas ◽  
R. Rosas-Cedillo ◽  
...  
Keyword(s):  
Mass Spectrometry ◽  
Hydroxyl Groups ◽  
Mineralogical Characterization ◽  
Fourier Transform Spectrometry ◽  
Stretching Vibration ◽  
Kaolinitic Clay ◽  
Diffuse Reflectance Infrared ◽  
Refractory Bricks

AbstractFew reports exist on the use of Diffuse Reflectance Infrared Fourier Transform Spectrometry coupled with Mass Spectrometry (DRIFTS-MS) in situ to monitor the dehydroxylation of kaolinitic clays. The use of DRIFTS-MS in situ allows study of the effect of heat treatment on the dehydroxylation, identifying intensities and temperatures at which the hydroxyl groups are released, forming metakaolinite and meta-alunite. The effluent gases from the infrared cell were analysed by mass spectrometry. The decrease in intensity of the bands at 3694, 3669, 3650 and 3621 cm−1 associated with the −OH stretching vibration modes of AlVI−OH−AlVI of kaolinite began at 450°C. Two additional bands at 3513 and 3485 cm−1 are associated with the vibration of AlVI−OH of alunite that also began to disappear during thermal treatment. Monitoring of the fractions m/e 17 and 18 using a mass spectrometer revealed that the intensity of these fractions increased starting at 450°C. Therefore, it is possible to study the dehydroxylation process of clays during thermal treatment.Chemical and mineralogical characterization of a kaolinitic clay (KN) fromMexico showed that the clay consists of 64.8% kaolinite, 11.0% alunite and 24.4% quartz based on PXRD, EDS, TG/DTA, TEM and FTIR results, and suggested that the material might have potential for use in the manufacture of ceramics, refractory bricks or geopolymers.

scholarly journals Building the Radiocarbon Chronology for the Archaeological Site Ufa-II, Bashkortostan, Russia: Is this the Elusive “Bashkort” of Medieval Sources?

Radiocarbon ◽  
2013 ◽  
Vol 55 (3) ◽  
pp. 1278-1285
Author(s):  
Vladimir A Levchenko ◽  
Flarit A Sungatov
Keyword(s):  
Mass Spectrometry ◽  
Accelerator Mass Spectrometry ◽  
Archaeological Site ◽  
Radiocarbon Dates ◽  
Site Occupation ◽  
Radiocarbon Chronology ◽  
First Time ◽  
Good Agreement

A suite of accelerator mass spectrometry (AMS) radiocarbon dates for the Ufa-II archaeological site in Bashkortostan, Russia, is obtained for the first time. Dating was done on charcoal samples from a sequence of cultural deposits collected during the 2011 digging season. An age-depth chronology is established using the Bayesian deposition General Outlier P_Sequence model. The oldest age for the site at the horizon immediately over the sterile ground was cal AD 137–237 (68% probability), corresponding to the beginning of site occupation. The youngest 14C date found was late 6th to early 7th century cal AD for the extensive planked boardwalks unearthed at the site. The 14C dates are in good agreement with archaeological determinations based on discovered artifacts.

scholarly journals Marine Turtle Bones from an Archaeological Site in Polynesia Yield Reliable Age Determinations

Radiocarbon ◽  
1990 ◽  
Vol 32 (2) ◽  
pp. 143-147 ◽  
Author(s):  
T S Dye
Keyword(s):  
Mass Spectrometry ◽  
Sample Size ◽  
Accelerator Mass Spectrometry ◽  
South Pacific ◽  
Archaeological Site ◽  
Marine Turtle ◽  
Long Distance ◽  
Marine Turtles ◽  
Ams Dating ◽  
Age Determinations

Accelerator mass spectrometry dating of three 50g samples of marine turtle bone from the basal cultural stratum of the Tongoleleka archaeological site, Lifuka Island, Kingdom of Tonga, South Pacific yields results that agree with conventional 14C dates on marine shell. A method for calibrating these dates that takes into account the long distance migrations of marine turtles in the South Pacific is proposed. A sample size greater than 50g is recommended for routine AMS dating of marine turtle bone.

scholarly journals ANÁLISE QUÍMICO-MINERALÓGICA DE OCRES E A BUSCA POR CORRELAÇÕES ARQUEOLÓGICAS COM OS PIGMENTOS DE PINTURAS RUPESTRES DO SÍTIO PEDRA DO CANTAGALO I

2019 ◽  
Vol 34 (1) ◽  
pp. 126
Author(s):  
Heralda Kelis Sousa Da Silva ◽  
Luis Carlos Duarte Cavalcante ◽  
José Domingos Fabris
Keyword(s):  
Iron Oxides ◽  
Archaeological Site ◽  
Mineralogical Analysis ◽  
Mineralogical Characterization ◽  
Field Surveys ◽  
Silicate Minerals ◽  
De Se ◽  
Apparent Evidence ◽  
Made In

Este trabalho foi devotado à análise arqueométrica de ocres vermelhos e amarelos do sítio arqueológico Pedra do Cantagalo I, Piripiri, Piauí. Prospecções foram efetuadas nas proximidades do abrigo rochoso, no interesse particular de se identificar jazidas fontes dos pigmentos minerais das pinturas rupestres. A composição químico-mineralógica dos ocres foi correlacionada com os dados correspondentes aos dos materiais minerais oriundos das jazidas do entorno e das camadas de tintas das pinturas rupestres das superfícies areníticas decoradas do sítio. Os resultados obtidos mostram evidências de que os ocres fontes dos pigmentos das pinturas rupestres foram originalmente enriquecidos, na preparação arqueológica, por concentração das espécies oxídicas ferruginosas e aluminosas, às expensas da redução quantitativa dos minerais silicatados, do material precursor diretamente retirado das jazidas.CHEMICAL-MINERALOGICAL ANALYSIS OF OCHRES AND THE SEARCH FOR ARCHAEOLOGICAL CORRELATIONS WITH THE PIGMENTS OF RUPESTRIAN PAINTINGS OF THE SITE PEDRA DO CANTAGALO IABSTRACTThis archaeometric work was devoted to the chemical-mineralogical characterization of red and yellow ochres of the archaeological site Pedra do Cantagalo I, Piripiri, Piauí. Field surveys were made in the neighboring of the rocky shelter, seeking for any apparent evidence signalizing the mineral source of such mineral pigments. The chemicalmineralogical composition of the ochres was correlated with corresponding data obtained from analyzing the nature of the minerals from the surrounding deposits and from the paint layers of the rupestrian paintings on the decorated sandstone surfaces of this archaeological site. The results for the ochres fairly show clear evidence that the ferruginous phases, as well as aluminum-containing minerals, were prepared for the enrichment in iron oxides, apparently at the expense of the removal of silicate minerals, from the material withdrawn from the deposits.Keywords: Ochres; Mössbauer spectroscopy; Archaeometry.

NEW AMS 14C DATES OF A MULTICULTURAL ARCHAEOLOGICAL SITE FROM THE PALEO-DELTAIC REGION OF WEST BENGAL, INDIA: CULTURAL AND GEO-ARCHAEOLOGICAL IMPLICATIONS

Radiocarbon ◽  
2021 ◽  
pp. 1-11
Author(s):  
Nabanita Naskar ◽  
Kaushik Gangopadhyay ◽  
Susanta Lahiri ◽  
Punarbasu Chaudhuri ◽  
Rajveer Sharma ◽  
...  
Keyword(s):  
Mass Spectrometry ◽  
Accelerator Mass Spectrometry ◽  
Late Holocene ◽  
West Bengal ◽  
Archaeological Site ◽  
Humid Tropics ◽  
Age Dating ◽  
New Delhi ◽  
Absolute Age ◽  
Calendar Dates

ABSTRACT This study is on the absolute age dating of a multicultural site of Erenda, East Medinipur district, in coastal West Bengal, India. Charcoal samples were collected and measured using the accelerator mass spectrometry (AMS) facility at the Inter-University Accelerator Centre, New Delhi, India. These samples were collected from secured stratigraphic context of two excavated trenches. A careful collection of samples from two trenches provided us with the first calendar dates, 950 BCE and 1979 BCE, of protohistoric sites in coastal West Bengal. These calibrated calendar dates not only have wider significance in terms of archaeology but also methodological implications to understand the relevance of application of AMS from the dynamic coastal landscape in the humid tropics during the late Holocene period.

Chemical and mineralogical characterization of a Cretaceous clay from the Lousã Basin (Central Portugal)

Clay Minerals ◽  
1988 ◽  
Vol 23 (4) ◽  
pp. 411-422 ◽  
Author(s):  
M. I. Prudêncio ◽  
J. C. Waerenborgh ◽  
J. M. P. Cabral
Keyword(s):  
Iron Age ◽  
Mossbauer Spectroscopy ◽  
Archaeological Site ◽  
Raw Material ◽  
Mineralogical Characterization ◽  
Size Fractions ◽  
Central Portugal ◽  
Compositional Group ◽  
Mineralogical Compositions

AbstractSamples of two lenticular clay bodies from a Cretaceous deposit near Padrão (Lousã basin) were characterized by INAA, XRD and Mössbauer spectroscopy. This clay is believed to be the raw material used to manufacture the Iron Age and Roman fine grey pottery from Conímbriga. The differences observed in the chemical and mineralogical compositions of the clay samples and of different size fractions are consistent with the high variance found in the compositional group corresponding to that archaeological site.

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