Espectroscopia micro-Raman e MEV/EDS aplicados a minerais do Craton São Francisco: evidência da formação de pirita mediada biogenicamente e suas conexões com a origem da vida
The occurrence and isotopic composition of carbonaceous components in ancient rocks are strong evidence of life forms on the Earth's surface since the Eoarchean (> 3.7 Ga). These organic components are found in rocks formed in different contexts and the earliest examples of organic matter ar...
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Universidade Federal de São Carlos
2019
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ftunivfsaocarlos:oai:repositorio.ufscar.br:ufscar/11370 2023-05-15T16:30:27+02:00 Espectroscopia micro-Raman e MEV/EDS aplicados a minerais do Craton São Francisco: evidência da formação de pirita mediada biogenicamente e suas conexões com a origem da vida Cruz, Daniele Caroline Fonseca Dias, Airton Natanael Coelho http://lattes.cnpq.br/7070166380084691 Constantino, Carlos José Leopoldo http://lattes.cnpq.br/6118325967319836 http://lattes.cnpq.br/2213289342956572 2019-03-19 https://repositorio.ufscar.br/handle/ufscar/11370 por por Universidade Federal de São Carlos UFSCar Programa de Pós-Graduação em Ciência dos Materiais - PPGCM-So Câmpus Sorocaba CRUZ, Daniele Caroline Fonseca. Espectroscopia micro-Raman e MEV/EDS aplicados a minerais do Craton São Francisco: evidência da formação de pirita mediada biogenicamente e suas conexões com a origem da vida. 2019. Dissertação (Mestrado em Ciência dos Materiais) – Universidade Federal de São Carlos, Sorocaba, 2019. Disponível em: https://repositorio.ufscar.br/handle/ufscar/11370. https://repositorio.ufscar.br/handle/ufscar/11370 Acesso aberto Pirita Espectroscopia micro-Raman Bacia de Jacobina Greenstone Belt Mundo Novo CIENCIAS EXATAS E DA TERRA::GEOCIENCIAS::GEOLOGIA::MINERALOGIA Dissertação 2019 ftunivfsaocarlos 2023-01-14T20:35:30Z The occurrence and isotopic composition of carbonaceous components in ancient rocks are strong evidence of life forms on the Earth's surface since the Eoarchean (> 3.7 Ga). These organic components are found in rocks formed in different contexts and the earliest examples of organic matter are found in Isua Greenstone Belt rocks (> 3.7 Ga) in Greenland; in the Pilbara Craton, at the North Pole Dome region (> 3.4 Ga), Australia; and in South Africa, in the Greenstone Belt of Barberton (> 3.2 Ga). In these examples, organic matter is associated with rocks formed in oceanic environments, in the vicinity of exhaling fumaroles, as well as in coastal environments. Another important example is the Witwatersrand Basin (2.9 to 2.7 Ga) in South Africa, where the organic matter is found widespread as bitumen, oil fluid inclusions and graphite inclusions in detrital components of conglomerate horizons. Organic matter in this basin has an intrinsic relationship with gold mineralization, uranium, and pyrite. Specifically, in the São Francisco Craton, State of Bahia, there are two deposits that have similarities with those mentioned above, although there are differences between their ages of formation. The first of these occurs in the Mundo Novo Greenstone Belt. The second deposit, represented by the conglomerates of the Jacobine Basin, is in many ways similar to the Witwatersrand Basin and its mineralization of gold, uranium, and pyrite. In both deposits are reported the occurrence of organic matter. For this reason, analyzes were performed via micro-Raman spectroscopy and SEM/EDS on pyrite grains to identify and characterize the association of the organic matter with gold deposits of Jacobina Basin and the Fazenda Coqueiro VMS deposit, of the MNGB, Bahia, Brazil. The results clearly show the presence of carbonaceous agglomerates (characteristic of organic matter) - peaks between 1400 and 1660 cm-1. Moreover, the presence of cline and calcochlorites also identified in the micro-Raman spectra potentiate the presence ... Thesis Greenland North Pole Repositório Institucional Universidade Federal de São Carlos (RI UFSCar) Greenland North Pole Pirita ENVELOPE(-57.950,-57.950,-61.917,-61.917) |
institution |
Open Polar |
collection |
Repositório Institucional Universidade Federal de São Carlos (RI UFSCar) |
op_collection_id |
ftunivfsaocarlos |
language |
Portuguese |
topic |
Pirita Espectroscopia micro-Raman Bacia de Jacobina Greenstone Belt Mundo Novo CIENCIAS EXATAS E DA TERRA::GEOCIENCIAS::GEOLOGIA::MINERALOGIA |
spellingShingle |
Pirita Espectroscopia micro-Raman Bacia de Jacobina Greenstone Belt Mundo Novo CIENCIAS EXATAS E DA TERRA::GEOCIENCIAS::GEOLOGIA::MINERALOGIA Cruz, Daniele Caroline Fonseca Espectroscopia micro-Raman e MEV/EDS aplicados a minerais do Craton São Francisco: evidência da formação de pirita mediada biogenicamente e suas conexões com a origem da vida |
topic_facet |
Pirita Espectroscopia micro-Raman Bacia de Jacobina Greenstone Belt Mundo Novo CIENCIAS EXATAS E DA TERRA::GEOCIENCIAS::GEOLOGIA::MINERALOGIA |
description |
The occurrence and isotopic composition of carbonaceous components in ancient rocks are strong evidence of life forms on the Earth's surface since the Eoarchean (> 3.7 Ga). These organic components are found in rocks formed in different contexts and the earliest examples of organic matter are found in Isua Greenstone Belt rocks (> 3.7 Ga) in Greenland; in the Pilbara Craton, at the North Pole Dome region (> 3.4 Ga), Australia; and in South Africa, in the Greenstone Belt of Barberton (> 3.2 Ga). In these examples, organic matter is associated with rocks formed in oceanic environments, in the vicinity of exhaling fumaroles, as well as in coastal environments. Another important example is the Witwatersrand Basin (2.9 to 2.7 Ga) in South Africa, where the organic matter is found widespread as bitumen, oil fluid inclusions and graphite inclusions in detrital components of conglomerate horizons. Organic matter in this basin has an intrinsic relationship with gold mineralization, uranium, and pyrite. Specifically, in the São Francisco Craton, State of Bahia, there are two deposits that have similarities with those mentioned above, although there are differences between their ages of formation. The first of these occurs in the Mundo Novo Greenstone Belt. The second deposit, represented by the conglomerates of the Jacobine Basin, is in many ways similar to the Witwatersrand Basin and its mineralization of gold, uranium, and pyrite. In both deposits are reported the occurrence of organic matter. For this reason, analyzes were performed via micro-Raman spectroscopy and SEM/EDS on pyrite grains to identify and characterize the association of the organic matter with gold deposits of Jacobina Basin and the Fazenda Coqueiro VMS deposit, of the MNGB, Bahia, Brazil. The results clearly show the presence of carbonaceous agglomerates (characteristic of organic matter) - peaks between 1400 and 1660 cm-1. Moreover, the presence of cline and calcochlorites also identified in the micro-Raman spectra potentiate the presence ... |
author2 |
Dias, Airton Natanael Coelho http://lattes.cnpq.br/7070166380084691 Constantino, Carlos José Leopoldo http://lattes.cnpq.br/6118325967319836 http://lattes.cnpq.br/2213289342956572 |
format |
Thesis |
author |
Cruz, Daniele Caroline Fonseca |
author_facet |
Cruz, Daniele Caroline Fonseca |
author_sort |
Cruz, Daniele Caroline Fonseca |
title |
Espectroscopia micro-Raman e MEV/EDS aplicados a minerais do Craton São Francisco: evidência da formação de pirita mediada biogenicamente e suas conexões com a origem da vida |
title_short |
Espectroscopia micro-Raman e MEV/EDS aplicados a minerais do Craton São Francisco: evidência da formação de pirita mediada biogenicamente e suas conexões com a origem da vida |
title_full |
Espectroscopia micro-Raman e MEV/EDS aplicados a minerais do Craton São Francisco: evidência da formação de pirita mediada biogenicamente e suas conexões com a origem da vida |
title_fullStr |
Espectroscopia micro-Raman e MEV/EDS aplicados a minerais do Craton São Francisco: evidência da formação de pirita mediada biogenicamente e suas conexões com a origem da vida |
title_full_unstemmed |
Espectroscopia micro-Raman e MEV/EDS aplicados a minerais do Craton São Francisco: evidência da formação de pirita mediada biogenicamente e suas conexões com a origem da vida |
title_sort |
espectroscopia micro-raman e mev/eds aplicados a minerais do craton são francisco: evidência da formação de pirita mediada biogenicamente e suas conexões com a origem da vida |
publisher |
Universidade Federal de São Carlos |
publishDate |
2019 |
url |
https://repositorio.ufscar.br/handle/ufscar/11370 |
long_lat |
ENVELOPE(-57.950,-57.950,-61.917,-61.917) |
geographic |
Greenland North Pole Pirita |
geographic_facet |
Greenland North Pole Pirita |
genre |
Greenland North Pole |
genre_facet |
Greenland North Pole |
op_relation |
CRUZ, Daniele Caroline Fonseca. Espectroscopia micro-Raman e MEV/EDS aplicados a minerais do Craton São Francisco: evidência da formação de pirita mediada biogenicamente e suas conexões com a origem da vida. 2019. Dissertação (Mestrado em Ciência dos Materiais) – Universidade Federal de São Carlos, Sorocaba, 2019. Disponível em: https://repositorio.ufscar.br/handle/ufscar/11370. https://repositorio.ufscar.br/handle/ufscar/11370 |
op_rights |
Acesso aberto |
_version_ |
1766020175479439360 |