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for the enrichment in iron oxides, apparently at the expense of the removal of silicate minerals, from the material withdrawn from the deposits.Keywords: Ochres; Mössbauer spectroscopy; Archaeometry.

scholarly journals Characterization of Ancient Red Iron Oxides Excavated from the Shimo-ohgibaru Archaeological Site in Kumamoto, Japan

2013 ◽  
Vol 60 (4) ◽  
pp. 146-153 ◽  
Author(s):  
Hiromi TSUJI ◽  
Ryu MURAKAMI ◽  
Takashi MIYAZAKI ◽  
Hideki HASHIMOTO ◽  
Teruaki DANNO ◽  
...  
Keyword(s):  
Iron Oxides ◽  
Archaeological Site

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.

Characterization of exogenic fulgurites from an archaeological site in Tiedra, Valladolid, Spain

2019 ◽  
Vol 156 (08) ◽  
pp. 1455-1462
Author(s):  
Pablo Martín-Ramos ◽  
Francisco PSC Gil ◽  
Francisco J Martín-Gil ◽  
Jesús Martín-Gil
Keyword(s):  
Raman Spectroscopy ◽  
Fourier Transform ◽  
Infrared Spectroscopy ◽  
Fluorescence Spectroscopy ◽  
Iron Oxides ◽  
Archaeological Site ◽  
X Ray ◽  
Shocked Quartz ◽  
Type V

AbstractStudies on type-V fulgurites are very sparse in the literature. This work reports on the characterization of natural exogenic fulgurites found at the archaeological site of Cerro de la Ermita (Tiedra, Valladolid, Spain), which was firstly a Celtiberian and then a Roman locum sacrum. Data from X-ray powder diffraction, X-ray fluorescence spectroscopy, Fourier-transform infrared spectroscopy and Raman spectroscopy suggest that the fulgurites consist of naquite, piroxenes, iron oxides, shocked quartz and neo-formed cristobalite.

scholarly journals Mineralogical characterization of an ancient pottery from the la Candelaria archaeological site, Santa Helena del Opón, Santander (Colombia)

2019 ◽  
Vol 3 (4) ◽  
Author(s):  
Carlos Alberto Rios-Reyes ◽  
Erika Daniela Nunez-Alarcon ◽  
Laura Sofia Puentes-Arguello ◽  
Juan Camilo BarriosLopez ◽  
Leonardo Moreno-Gonzalez ◽  
...  
Keyword(s):  
Archaeological Site ◽  
Mineralogical Characterization ◽  
Ancient Pottery

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.

Mineralogical Characterization of a Polymetallic Concentrate Portovelo Mining District. Bioleaching by a Native Bacterial Consortium

2009 ◽  
Vol 71-73 ◽  
pp. 481-484 ◽  
Author(s):  
F. Gordillo ◽  
J.P. Suarez ◽  
Vasan Sanmartín ◽  
P. Aguirre ◽  
J.C. Gentina ◽  
...  
Keyword(s):  
Mining Operation ◽  
Bacterial Consortium ◽  
Mining District ◽  
Mineralogical Analysis ◽  
Mineralogical Characterization ◽  
Physiological Characterization ◽  
Southern Ecuador ◽  
Refractory Gold ◽  
Polymetallic Sulfides

The mining district of Zaruma-Portovelo of southern Ecuador is a deposit of polymetallic sulfides worked since 1908. Currently the small traditional mining operation processes 1800 tons of ore a day, generating environmental waste that is accumulated and systematically discharged into the Calera and Amarillo Rivers. In this watershed area of Puyango-Tumbes, where samples were taken and subjected to gravimetric concentration, a mineralogical analysis of the concentrate was made. Samples of sediments taken from areas of weathered mining shafts were used to isolate native microorganisms for subsequent molecular and physiological characterization. The mineral concentrate contains 66.63 % of pyrite, 175 ppm Ag and 6.9 ppm Au (with 80 % of refractory gold). This mineral was subjected to biooxidation by the isolated native organisms. In experiments with pulp density of 10%, the solubility of the sulfides was very significant, reaching concentrations of Fe3 + 30 g/L and sulfate 60 g/L.

Bioactivity of Marine Natural Product Xyloketals

2020 ◽  
Vol 17 ◽  
Author(s):  
Biswajit Panda ◽  
Amal Kumar Gooyee
Keyword(s):  
Natural Products ◽  
Marine Natural Product ◽  
Ischemic Brain Injury ◽  
Ischemic Brain ◽  
Activity Inhibition ◽  
Life Saving ◽  
Behavior Suppression ◽  
Major Emphasis ◽  
Made In

: Oceans can play a major role in supplying life-saving medicines in the world in future. Although considerable progress has been made in finding new medicines from marine sources, large efforts are still necessary to examine such molecules for clinical applications. Xyloketals are an important group of natural products with various powerful and prominent bioactivities such as inhibition of acetylcholine esterase, antioxidant activity, inhibition of L-calcium channels, radicalscavenging behavior, suppression of cell proliferation, reduction of neonatal hypoxic-ischemic brain injury, etc. This review describes the isolation and structural characterization of all xyloketal natural products giving major emphasis on their bioactivity.

Characterization of Auditory Disability and Its Relation to the Resilience

2018 ◽  
Vol 5 (2) ◽  
pp. 15
Author(s):  
Bibian Bibeca Bumbila García ◽  
Hernán Andrés Cedeño Cedeño ◽  
Tatiana Moreira Chica ◽  
Yaritza Rossana Parrales Ríos
Keyword(s):  
Social Integration ◽  
Conceptual Analysis ◽  
Disabled People ◽  
Disabled Students ◽  
Hearing Disability ◽  
Technical University ◽  
The Relationship ◽  
Made In

The objective of the work is to establish the characterization of the auditory disability and its relationship with resilience at the Technical University of Manabí. The article shows a conceptual analysis related to the inclusion and social integration of disabled students. Based on the fact that the person with disabilities grows and develops in the same way as that of people without disabilities and what usually happens is that disabled people are rejected and discriminated against based on a prefabricated and erroneous conceptualization of these people. The results associated with the application of the SV-RES test prepared by the researchers are shown (Saavedra & Villalta, 2008b). Characterization of the auditory deficit is made in the students, and the limitations that derive from it are pointed out. We analyze the particularities related to communication with students who have a hearing disability and resilience in this type of student, where some personal highlights that in this sense constitute an example of resilience. Finally, the results related to the study of the relationship between students' hearing disability and the level of resilience dimensions are shown.

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