GEOQUÍMICA DO SISTEMA LACUSTRE CARBONÁTICO APTIANO DA BACIA DO JATOBÁ, NORDESTE DO BRASIL
This paper presents analyses of C and O isotopes and results of X-ray diffractometry in carbonate and terrigenous rocks of the Aptian lacustrine system of Serra Negra, Jatobá basin, northeastern Brazil. The carbonates were analyzed from samples collected from logs of well and outcrops. Thin sections...
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| Format: | Article |
| Language: | English |
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Sociedade Brasileira de Geoquímica
2017-04-01
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| Series: | Geochimica Brasiliensis |
| Subjects: |
| _version_ | 1818646645354528768 |
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| author | Dunaldson Eliézer Guedes Alcoforado Rocha Rafael Pereira Lima José Diego Dias Varas Alex Souza de Moraes José Antônio Barbosa Tiago Siqueira Miranda Virgínio Henrique de Miranda Lopes Neumann |
| author_facet | Dunaldson Eliézer Guedes Alcoforado Rocha Rafael Pereira Lima José Diego Dias Varas Alex Souza de Moraes José Antônio Barbosa Tiago Siqueira Miranda Virgínio Henrique de Miranda Lopes Neumann |
| author_sort | Dunaldson Eliézer Guedes Alcoforado Rocha |
| collection | DOAJ |
| description | This paper presents analyses of C and O isotopes and results of X-ray diffractometry in carbonate and terrigenous rocks of the Aptian lacustrine system of Serra Negra, Jatobá basin, northeastern Brazil. The carbonates were analyzed from samples collected from logs of well and outcrops. Thin sections were studied and have been shown that the carbonate succession are composed by mudstones, wackstones and packstones, ranging from light beige to dark brown in color, with framboidal pyrite. Analyses of C and O isotopes were conducted in 113 samples. The δ13C values ranged from -8.72 to 2.47 ‰ VPDB and δ18O values presented values between -8.67 to -3.96 ‰ VPDB. These values show good correlation with those obtained in other studies for lacustrine carbonates. Based on these results it is proposed here that the carbonates of Serra Negra were deposited in a hydrologically closed paleolake. The X-ray difractograms showed illite and smectite as dominant clay minerals in laminated limestones, shales, aswell as in sandstones lithofacies. |
| first_indexed | 2024-12-17T00:49:56Z |
| format | Article |
| id | doaj.art-292e0349dc7b40a4a76d52e72852cbc3 |
| institution | Directory Open Access Journal |
| issn | 0102-9800 2358-2812 |
| language | English |
| last_indexed | 2024-12-17T00:49:56Z |
| publishDate | 2017-04-01 |
| publisher | Sociedade Brasileira de Geoquímica |
| record_format | Article |
| series | Geochimica Brasiliensis |
| spelling | doaj.art-292e0349dc7b40a4a76d52e72852cbc32022-12-21T22:09:48ZengSociedade Brasileira de GeoquímicaGeochimica Brasiliensis0102-98002358-28122017-04-0130212213510.21715/GB2358-2812.2016302122GEOQUÍMICA DO SISTEMA LACUSTRE CARBONÁTICO APTIANO DA BACIA DO JATOBÁ, NORDESTE DO BRASILDunaldson Eliézer Guedes Alcoforado Rocha0Rafael Pereira Lima1José Diego Dias Varas2Alex Souza de Moraes3José Antônio Barbosa4Tiago Siqueira Miranda5Virgínio Henrique de Miranda Lopes Neumann6CPRM - Serviço Geológico do BrasilUniversidade Federal de AlagoasItapicuru Cimento NassauUniversidade Federal Rural de PernambucoUniversidade Federal de PernambucoUniversidade Federal de PernambucoUniversidade Federal de PernambucoThis paper presents analyses of C and O isotopes and results of X-ray diffractometry in carbonate and terrigenous rocks of the Aptian lacustrine system of Serra Negra, Jatobá basin, northeastern Brazil. The carbonates were analyzed from samples collected from logs of well and outcrops. Thin sections were studied and have been shown that the carbonate succession are composed by mudstones, wackstones and packstones, ranging from light beige to dark brown in color, with framboidal pyrite. Analyses of C and O isotopes were conducted in 113 samples. The δ13C values ranged from -8.72 to 2.47 ‰ VPDB and δ18O values presented values between -8.67 to -3.96 ‰ VPDB. These values show good correlation with those obtained in other studies for lacustrine carbonates. Based on these results it is proposed here that the carbonates of Serra Negra were deposited in a hydrologically closed paleolake. The X-ray difractograms showed illite and smectite as dominant clay minerals in laminated limestones, shales, aswell as in sandstones lithofacies.bacia do jatobácarbonatos lacustres aptianosgeoquímica isotópica |
| spellingShingle | Dunaldson Eliézer Guedes Alcoforado Rocha Rafael Pereira Lima José Diego Dias Varas Alex Souza de Moraes José Antônio Barbosa Tiago Siqueira Miranda Virgínio Henrique de Miranda Lopes Neumann GEOQUÍMICA DO SISTEMA LACUSTRE CARBONÁTICO APTIANO DA BACIA DO JATOBÁ, NORDESTE DO BRASIL Geochimica Brasiliensis bacia do jatobá carbonatos lacustres aptianos geoquímica isotópica |
| title | GEOQUÍMICA DO SISTEMA LACUSTRE CARBONÁTICO APTIANO DA BACIA DO JATOBÁ, NORDESTE DO BRASIL |
| title_full | GEOQUÍMICA DO SISTEMA LACUSTRE CARBONÁTICO APTIANO DA BACIA DO JATOBÁ, NORDESTE DO BRASIL |
| title_fullStr | GEOQUÍMICA DO SISTEMA LACUSTRE CARBONÁTICO APTIANO DA BACIA DO JATOBÁ, NORDESTE DO BRASIL |
| title_full_unstemmed | GEOQUÍMICA DO SISTEMA LACUSTRE CARBONÁTICO APTIANO DA BACIA DO JATOBÁ, NORDESTE DO BRASIL |
| title_short | GEOQUÍMICA DO SISTEMA LACUSTRE CARBONÁTICO APTIANO DA BACIA DO JATOBÁ, NORDESTE DO BRASIL |
| title_sort | geoquimica do sistema lacustre carbonatico aptiano da bacia do jatoba nordeste do brasil |
| topic | bacia do jatobá carbonatos lacustres aptianos geoquímica isotópica |
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