Composição molecular e origem paleobotânica de âmbares da bacia do Araripe, Formação Santana

Pereira, Ricardo; Carvalho, Ismar de Souza; Fernandes, Antônio Carlos; Azevedo, Débora de Almeida

doi:10.1590/s0100-40422009000600032

Cited by 7 publications

(7 citation statements)

References 18 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…There are prior studies reporting that the amber occurrences from this period are associated to Araucariaceae or Cheirolepidiaceae sources, such as deposits in Spain, Africa and Middle Eastern. 6,7,8,14 In this way, prior reports concerning ambers from South America, 9,10,13 as well as the samples described here can enhance the understanding about the Cretaceous worldwide distribution of plant resins and the molecular composition of their fossil resins.…”

Section: Chemosystematic Implications Possible Botanical Origins Andmentioning

confidence: 58%

“…The results obtained were compared with that reported before to other samples of the same stratum 9 and other brazilian ambers with analogous biomarker composition. 10 This work provides new data concerning the molecular composition of Brazilian fossil resins, mainly the Recôncavo ambers, based in new information reported about chemotaxonomic aspects of coniferophytes. 7 In this way, the research about Brazilian Cretaceous amber has a great importance to increase the knowledge regarding the chemical composition of fossil resins in deposits from the South hemisphere, particularly South America.…”

Section: Introductionmentioning

confidence: 97%

“…The geochemical data of Brazilian ambers pointed to several possible botanical origins, such as Cupressaceae, Araucariaceae or Podocarpaceae families. 9,10 For the Recôncavo ambers, considering the presence of kauranes and phyllocladanes, almost certainly the biological affinity is Araucariaceae or Podocarpaceae families. 9 The Table 1 summarizes some of the worldwide amber occurrences in Lower Cretaceous sediments, showing the proposed botanical affinities.…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Chemotaxonomical aspects of lower Cretaceous amber from Recôncavo Basin, Brazil

Pereira

Carvalho

Carlos

et al. 2011

J. Braz. Chem. Soc.

Self Cite

View full text Add to dashboard Cite

A composição química de amostras de âmbar provenientes da Bacia do Recôncavo (Salvador, Bahia), datadas do Cretáceo Inferior, foi determinada por meio de CG-EM para caracterização das suas possíveis fontes botânicas. Os principais compostos identificados foram diterpenoides, tais como abietano, deidroabietano, tetraidroreteno, deidroabietol, ácido deidroabiético, ferruginol e sugiol. Outras classes de diterpenoides ou triterpenos não foram detectados. A composição dos extratos e os dados quimiotaxonômicos permitiram relacionar as amostras com coníferas das famílias Podocarpaceae ou Cheirolepidiaceae devido à detecção do ferruginol, um biomarcador específico para estas famílias. Desta forma, os dados concernentes aos âmbares da Bacia do Recôncavo forneceram informações quanto à presença de uma flora resinífera na Formação Maracangalha, quando da deposição de seus sedimentos durante o Cretáceo Inferior.The chemical composition of Lower Cretaceous amber samples from Recôncavo Basin (Salvador, Bahia) was performed by GC-MS to characterize possible botanical sources. The compounds identified were hydrocarbonic and polar diterpenoids, such as abietane, dehydroabietane, tetrahydroretene, dehydroabietol, dehydroabietic acid, ferruginol and sugiol. Other diterpenoid classes were not detected as well as triterpenoids. The composition of the extracts and chemosystematic data allows relating the samples to conifers of Podocarpaceae or Cheirolepidiaceae families due to detection of ferruginol, a specific biomarker to these families. The data concerning Cretaceous amber in the Recôncavo Basin provided information concerning the presence of a resinous flora in the Maracangalha Formation sediments during the Lower Cretaceous.

show abstract

Section: Chemosystematic Implications Possible Botanical Origins Andmentioning

confidence: 58%

Section: Introductionmentioning

confidence: 97%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Chemotaxonomical aspects of lower Cretaceous amber from Recôncavo Basin, Brazil

Pereira

Carvalho

Carlos

et al. 2011

J. Braz. Chem. Soc.

Self Cite

View full text Add to dashboard Cite

show abstract

“…The main occurrences of amber in this region are found in Tertiary deposits from Brazil, Colombia, Ecuador, French Guyana and Peru. 3,[26][27][28] Moreover, the literature have no more than three works reporting Cretaceous Brazilian ambers of the Amazonas, Araripe and Recôncavo basins analyzed by IR and GC-MS. 7,8,29 In this way, the present paper presents for the first time a solid state 13 C NMR study of Cretaceous amber in South America, providing complementary information about the nature of Brazilian ambers samples from Amazonas, Araripe and Recôncavo basins.…”

Section: Introductionmentioning

confidence: 95%

“…22, No. 1, 2011 characterization techniques have been proposed such as pyrolysis-gas chromatography-mass spectrometry (Py-GC-MS), 4,5 gas chromatography-mass spectrometry (GC-MS) 6,7,8 , solid state Fourier transform infrared (FT-IR) 9 and carbon 13 nuclear magnetic resonance spectroscopy ( 13 C NMR). 1,2 An important classification system based on the structural characteristics of the resins was proposed by Anderson and co-workers, [10][11][12] establishing five classes: Class I -polymers of labdanoid diterpenes, subclassified into Classes Ia, Ib and Ic; Class II -polymers of bicyclic sesquiterpenoid hydrocarbons; Class III -natural fossil polystyrene; Class IV -sesquiterpenoids based on the cedrane carbon skeleton; and Class V -non-polymeric diterpenoid carboxylic acid.…”

Section: Introductionmentioning

confidence: 99%

Solid state 13C NMR analysis of Brazilian cretaceous ambers

Pereira

Carvalho

Carlos

et al. 2011

J. Braz. Chem. Soc.

Self Cite

View full text Add to dashboard Cite

Espectros de ressonância magnética nuclear de 13 C com polarização cruzada e rotação no ângulo mágico (RMN-CPMAS de 13 C) foram obtidos pela primeira vez para três amostras de âmbar provenientes do Mesozóico da América do Sul. As amostras foram datadas como pertencentes ao Cretáceo Inferior e coletadas em sedimentos das bacias do Amazonas, Araripe e Recôncavo, Brasil. Todas as amostras apresentaram espectros muito similares, o que é consistente com uma fonte paleobotânica em comum. Algumas características dos espectros, tais como sinais mais intensos entre 38-39 ppm, sugerem relação entre os âmbares brasileiros e a família Araucariaceae. Todas as amostras são formadas de estruturas polilabdânicas que permitem associação com resinas de Classe Ib, estruturalmente constituídas por polímeros de diterpenos labdânicos. Informações quanto às mudanças estruturais ocorridas durante a maturação, tais como isomerização de insaturações D 8(17) e D 12(13) , também foram obtidas pelas análises por RMN-CPMAS de 13 C. Os resultados quanto à origem botânica das amostras são concordantes com aqueles alcançados por análises mediante cromatografia gasosa acoplada à espectrometria de massas (GC-MS). 13 C cross polarization with magic angle spinning nuclear magnetic resonance (13 C CPMAS NMR) spectra have been obtained for the first time to three Cretaceous amber samples from South America. The samples were dated to Lower Cretaceous and collected in sediments from the Amazonas, Araripe and Recôncavo basins, Brazil. All samples have very similar spectra, consistent with a common palaeobotanical source. Some aspects of the spectra suggest a relationship between Brazilian ambers and Araucariaceae family, such as intense resonances at 38-39 ppm. All samples are constituted by polylabdane structure associated to Class Ib resins, constituted by polymers of labdanoid diterpenes. Finally, information concerning some structural changes during maturation, such as isomerization of D 8(17) and D 12(13) unsaturations, were obtained by 13 C NMR analyses. The results concerning botanical affinities are in accordance with previous results obtained by gas chromatography-mass spectrometry (GC-MS).

show abstract