Mineral inclusions in diamonds from Chapada Diamantina, Bahia, Brazil: a Raman spectroscopic characterization
Abstract The Chapada Diamantina, located in the central region of the State of Bahia, is of important historical significance due to its diamond occurrences. Discovered in the nineteenth century, comprehensive research about the regional diamonds and their origins are still limited, demanding more i...
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| Format: | Article |
| Language: | English |
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Fundação Gorceix
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| Series: | REM: International Engineering Journal |
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| Online Access: | http://www.scielo.br/scielo.php?script=sci_arttext&pid=S2448-167X2018000100027&lng=en&tlng=en |
| _version_ | 1828259614699814912 |
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| author | Luísa Diniz Vilela de Carvalho Jurgen Schnellrath Silvia Regina de Medeiros |
| author_facet | Luísa Diniz Vilela de Carvalho Jurgen Schnellrath Silvia Regina de Medeiros |
| author_sort | Luísa Diniz Vilela de Carvalho |
| collection | DOAJ |
| description | Abstract The Chapada Diamantina, located in the central region of the State of Bahia, is of important historical significance due to its diamond occurrences. Discovered in the nineteenth century, comprehensive research about the regional diamonds and their origins are still limited, demanding more investigation in the matter. Looking for insights about their genesis, mineral inclusions in 23 alluvial diamonds from 4 garimpos located in the Chapada Diamantina were analyzed through the use of Raman micro spectroscopy. Additionally, the characteristics of nitrogen aggregation of the host diamonds were measured using Fourier-transform infrared spectroscopy (FTIR). The diamonds from Chapada Diamantina consist mainly of well-formed crystals, with dominant dodecahedral habits, characterized by faint to very light yellow body colors, typically with green and brown radiation spots on their surface. The main surface textures observed are related to processes that took place in the late stage resorption and during the residence of the diamonds in placer environments. The diamonds are predominantly type IaAB, with a significant occurrence of poorly aggregated nitrogen (Type IaA diamond). The main mineral assemblages of the studied peridotitic inclusions refer to a harzburgitic paragenesis. |
| first_indexed | 2024-04-13T03:12:08Z |
| format | Article |
| id | doaj.art-8bdae86719814968997c45fe87a8bcf9 |
| institution | Directory Open Access Journal |
| issn | 2448-167X |
| language | English |
| last_indexed | 2024-04-13T03:12:08Z |
| publisher | Fundação Gorceix |
| record_format | Article |
| series | REM: International Engineering Journal |
| spelling | doaj.art-8bdae86719814968997c45fe87a8bcf92022-12-22T03:05:02ZengFundação GorceixREM: International Engineering Journal2448-167X711273510.1590/0370-44672016710160S2448-167X2018000100027Mineral inclusions in diamonds from Chapada Diamantina, Bahia, Brazil: a Raman spectroscopic characterizationLuísa Diniz Vilela de CarvalhoJurgen SchnellrathSilvia Regina de MedeirosAbstract The Chapada Diamantina, located in the central region of the State of Bahia, is of important historical significance due to its diamond occurrences. Discovered in the nineteenth century, comprehensive research about the regional diamonds and their origins are still limited, demanding more investigation in the matter. Looking for insights about their genesis, mineral inclusions in 23 alluvial diamonds from 4 garimpos located in the Chapada Diamantina were analyzed through the use of Raman micro spectroscopy. Additionally, the characteristics of nitrogen aggregation of the host diamonds were measured using Fourier-transform infrared spectroscopy (FTIR). The diamonds from Chapada Diamantina consist mainly of well-formed crystals, with dominant dodecahedral habits, characterized by faint to very light yellow body colors, typically with green and brown radiation spots on their surface. The main surface textures observed are related to processes that took place in the late stage resorption and during the residence of the diamonds in placer environments. The diamonds are predominantly type IaAB, with a significant occurrence of poorly aggregated nitrogen (Type IaA diamond). The main mineral assemblages of the studied peridotitic inclusions refer to a harzburgitic paragenesis.http://www.scielo.br/scielo.php?script=sci_arttext&pid=S2448-167X2018000100027&lng=en&tlng=endiamondsChapada Diamantinamineral inclusionsRaman spectroscopy |
| spellingShingle | Luísa Diniz Vilela de Carvalho Jurgen Schnellrath Silvia Regina de Medeiros Mineral inclusions in diamonds from Chapada Diamantina, Bahia, Brazil: a Raman spectroscopic characterization REM: International Engineering Journal diamonds Chapada Diamantina mineral inclusions Raman spectroscopy |
| title | Mineral inclusions in diamonds from Chapada Diamantina, Bahia, Brazil: a Raman spectroscopic characterization |
| title_full | Mineral inclusions in diamonds from Chapada Diamantina, Bahia, Brazil: a Raman spectroscopic characterization |
| title_fullStr | Mineral inclusions in diamonds from Chapada Diamantina, Bahia, Brazil: a Raman spectroscopic characterization |
| title_full_unstemmed | Mineral inclusions in diamonds from Chapada Diamantina, Bahia, Brazil: a Raman spectroscopic characterization |
| title_short | Mineral inclusions in diamonds from Chapada Diamantina, Bahia, Brazil: a Raman spectroscopic characterization |
| title_sort | mineral inclusions in diamonds from chapada diamantina bahia brazil a raman spectroscopic characterization |
| topic | diamonds Chapada Diamantina mineral inclusions Raman spectroscopy |
| url | http://www.scielo.br/scielo.php?script=sci_arttext&pid=S2448-167X2018000100027&lng=en&tlng=en |
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