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29 results on '"Alves, Eduardo Q"'

3. Advances in the graphitization protocol at the Radiocarbon Laboratory of the Universidade Federal Fluminense (LAC-UFF) in Brazil

Author

Macario, Kita D, Oliveira, Fabiana M, Carvalho, Carla, Santos, Guaciara M, Xu, Xiaomei, Chanca, Ingrid S, Alves, Eduardo Q, Jou, Renata M, Oliveira, Maria Isabela, Pereira, Bruna B, Moreira, Vinicius, Muniz, Marcelo C, Linares, Roberto, Gomes, Paulo Roberto Silveira, dos Anjos, Roberto Meigikos, Castro, Maikel D, dos Anjos, Leandro, Marques, Aguinaldo N, and Rodrigues, Luiz Frederico

Published
2015

8. Holocene variations in Lake Titicaca water level and their implications for sociopolitical developments in the central Andes

Author

Guédron, Stéphane, Delaere, Christophe, Fritz, Sherilyn C., Tolu, Julie, Sabatier, Pierre, Devel, Anne-Lise, Heredia, Carlos, Vérin, Claire, Alves, Eduardo Q., Baker, Paul A., Guédron, Stéphane, Delaere, Christophe, Fritz, Sherilyn C., Tolu, Julie, Sabatier, Pierre, Devel, Anne-Lise, Heredia, Carlos, Vérin, Claire, Alves, Eduardo Q., and Baker, Paul A.

Abstract

Holocene climate in the high tropical Andes was characterized by both gradual and abrupt changes, which disrupted the hydrological cycle and impacted landscapes and societies. High-resolution paleoenvironmental records are essential to contextualize archaeological data and to evaluate the sociopolitical response of ancient societies to environmental variability. Middle-to-Late Holocene water levels in Lake Titicaca were reevaluated through a transfer function model based on measurements of organic carbon stable isotopes, combined with high-resolution profiles of other geochemical variables and paleoshoreline indicators. Our reconstruction indicates that following a prolonged low stand during the Middle Holocene (4000 to 2400 BCE), lake level rose rapidly ~15 m by 1800 BCE, and then increased another 3 to 6 m in a series of steps, attaining the highest values after ~1600 CE. The largest lake-level increases coincided with major sociopolitical changes reported by archaeologists. In particular, at the end of the Formative Period (500 CE), a major lake-level rise inundated large shoreline areas and forced populations to migrate to higher elevation, likely contributing to the emergence of the Tiwanaku culture.

Published
2023
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9. Graphitization reaction via zinc reduction: How low can you go?

Author

Macario, Kita D., Alves, Eduardo Q., Oliveira, Fabiana M., Moreira, Vinicius N., Chanca, Ingrid S., Carvalho, Carla, Jou, Renata M., Oliveira, Maria Isabela, Pereira, Bruna B., Hammerschlag, Izabela, Netto, Bruna S.M., Seixas, Amanda P., de Paiva, João Victor, Moreira, Lara, Cunha, Luana, Assumpção, Ayrton, Mallet, Pedro, Lima, Loise, and Lopes, Fabio

Published
2016
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12. Advances in the graphitization protocol at the Radiocarbon Laboratory of the Universidade Federal Fluminense (LAC-UFF) in Brazil

Author

Macario, Kita D., Oliveira, Fabiana M., Carvalho, Carla, Santos, Guaciara M., Xu, Xiaomei, Chanca, Ingrid S., Alves, Eduardo Q., Jou, Renata M., Oliveira, Maria Isabela, Pereira, Bruna B., Moreira, Vinicius, Muniz, Marcelo C., Linares, Roberto, Gomes, Paulo Roberto Silveira, dos Anjos, Roberto Meigikos, Castro, Maikel D., dos Anjos, Leandro, Marques, Aguinaldo N., and Rodrigues, Luiz Frederico

Published
2015
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13. ASSESSING THE 14C MARINE RESERVOIR EFFECT IN ARCHAEOLOGICAL CONTEXTS: DATA FROM THE CABEÇUDA SHELL MOUND IN SOUTHERN BRAZIL

Author

Alves, Eduardo Q, primary, Macario, Kita D, additional, Scheel-Ybert, Rita, additional, Oliveira, Fabiana M, additional, Colonese, André Carlo, additional, Giannini, Paulo César Fonseca, additional, Guimarães, Renato, additional, Fallon, Stewart, additional, Muniz, Marcelo, additional, Chivall, David, additional, and Bronk Ramsey, Christopher, additional

Published
2022
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14. ASSESSING THE 14C MARINE RESERVOIR EFFECT IN ARCHAEOLOGICAL CONTEXTS: DATA FROM THE CABEÇUDA SHELL MOUND IN SOUTHERN BRAZIL.

Author

Alves, Eduardo Q, Macario, Kita D, Scheel-Ybert, Rita, Oliveira, Fabiana M, Colonese, André Carlo, Giannini, Paulo César Fonseca, Guimarães, Renato, Fallon, Stewart, Muniz, Marcelo, Chivall, David, and Bronk Ramsey, Christopher

Subjects
RADIOCARBON dating, STABLE isotopes, X-ray diffraction, CARBON isotopes, BAYESIAN analysis, CHARCOAL, DIAGENESIS
Abstract

Prehistoric shell mounds can be useful for the quantification of the radiocarbon marine reservoir effect (MRE) and, at the same time, knowledge about the MRE allows for the establishment of robust chronologies for these sites. This creates a loop in which the archaeological setting has a dual role: it is part of both the method and the application. Therefore, it is paramount to address these sites from both archaeological and environmental perspectives, investigating their origin and diagenesis in order to overcome biases caused by post-depositional alterations. In this study, samples of bone, charcoal and shell from a Late Holocene shell mound in Southern Brazil, the Sambaqui de Cabeçuda, were analyzed following a multidisciplinary approach to disentangle the complex relationships between archaeology and the environment. We performed X-ray diffraction, radiocarbon dating, stable isotopes (δ13C, δ18O, δ15N) and anthracology analyses as well as Bayesian Chronological Models and Isotope Mixing Models to assess the local MRE and to reconstruct the diet of Cabeçuda builders. Our results reveal a negative local correction for the MRE (ΔR = –263 ± 46 14C yr), expected for the lagoon next to the site, and diets with considerable intakes of marine proteins. We examine the implications of these results for the chronology of the site and discuss a series of complications when performing MRE studies using shell mound sites. [ABSTRACT FROM AUTHOR]

Published
2023
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15. ASSESSING THE 14C MARINE RESERVOIR EFFECT IN ARCHAEOLOGICAL CONTEXTS: DATA FROM THE CABEÇUDA SHELL MOUND IN SOUTHERN BRAZIL

Author

Alves, Eduardo Q, Macario, Kita D, Scheel-Ybert, Rita, Oliveira, Fabiana M, Colonese, André Carlo, Giannini, Paulo César Fonseca, Guimarães, Renato, Fallon, Stewart, Muniz, Marcelo, Chivall, David, and Bronk Ramsey, Christopher

Abstract

ABSTRACTPrehistoric shell mounds can be useful for the quantification of the radiocarbon marine reservoir effect (MRE) and, at the same time, knowledge about the MRE allows for the establishment of robust chronologies for these sites. This creates a loop in which the archaeological setting has a dual role: it is part of both the method and the application. Therefore, it is paramount to address these sites from both archaeological and environmental perspectives, investigating their origin and diagenesis in order to overcome biases caused by post-depositional alterations. In this study, samples of bone, charcoal and shell from a Late Holocene shell mound in Southern Brazil, the Sambaqui de Cabeçuda, were analyzed following a multidisciplinary approach to disentangle the complex relationships between archaeology and the environment. We performed X-ray diffraction, radiocarbon dating, stable isotopes (δ13C, δ18O, δ15N) and anthracology analyses as well as Bayesian Chronological Models and Isotope Mixing Models to assess the local MRE and to reconstruct the diet of Cabeçuda builders. Our results reveal a negative local correction for the MRE (ΔR = –263 ± 46 14C yr), expected for the lagoon next to the site, and diets with considerable intakes of marine proteins. We examine the implications of these results for the chronology of the site and discuss a series of complications when performing MRE studies using shell mound sites.

Published
2023
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17. LAC-UFF STATUS REPORT: CURRENT PROTOCOLS AND RECENT DEVELOPMENTS

Author

Oliveira, Fabiana, primary, Macario, Kita, additional, Carvalho, Carla, additional, Moreira, Vinicius, additional, Alves, Eduardo Q, additional, Chanca, Ingrid, additional, Diaz, Maikel, additional, Jou, Renata, additional, Hammerschlag, Izabela, additional, Netto, Bruna M, additional, Oliveira, Maria Isabela, additional, Assumpção, Ayrton, additional, and Fernandes, Dayanne, additional

Published
2021
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19. Otolith-Based Chronology of Brazilian Shellmounds

Author

Carvalho, Carla, primary, Oliveira, Fabiana, additional, Macario, Kita, additional, Lima, Tania, additional, Chanca, Ingrid, additional, Alves, Eduardo Q, additional, Bertucci, Thayse, additional, and Aguilera, Orangel, additional

Published
2019
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21. The Marine Reservoir Effect on the Coast of Rio de Janeiro: Deriving ∆R Values from Fish Otoliths and Mollusk Shells

Author

Macario, Kita D, primary, Alves, Eduardo Q, additional, Belém, André Luiz, additional, Aguilera, Orangel, additional, Bertucci, Thayse, additional, Tenório, Maria Cristina, additional, Oliveira, Fabiana M, additional, Chanca, Ingrid S, additional, Carvalho, Carla, additional, Souza, Rosa, additional, Scheel-Ybert, Rita, additional, Nascimento, Gabriela S, additional, Dias, Fabio, additional, and Caon, Julia, additional

Published
2018
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27. Optimization of the Amount of Zinc in the Graphitization Reaction for Radiocarbon AMS Measurements at LAC-UFF

Author

Macario, Kita D, primary, Oliveira, Fabiana M, additional, Moreira, Vinicius N, additional, Alves, Eduardo Q, additional, Carvalho, Carla, additional, Jou, Renata M, additional, Oliveira, Maria Isabela, additional, Pereira, Bruna B, additional, Hammerschlag, Izabela, additional, Netto, Bruna, additional, Seixas, Amanda P, additional, Malafaia, João Vitor P, additional, Moreira, Lara, additional, Cunha, Luana, additional, Assumpção, Ayrton, additional, Mallet, Pedro, additional, Lima, Loise, additional, Lopes, Fabio, additional, Diaz, Maikel, additional, Chanca, Ingrid S, additional, and Gomes, Paulo R S, additional

Published
2016
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29. Radiocarbon measurements at LAC-UFF: Recent performance

Author

Linares, Roberto, primary, Macario, Kita D., additional, Santos, Guaciara M., additional, Carvalho, Carla, additional, dos Santos, Hellen C., additional, Gomes, Paulo R.S., additional, Castro, Maikel D., additional, Oliveira, Fabiana M., additional, and Alves, Eduardo Q., additional

Published
2015
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