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| Natura: | Artículo científico |
| Lingua: | en |
| Pubblicazione: |
Academia Brasileira de Ciências
2007
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| Accesso online: | https://www.redalyc.org/articulo.oa?id=32779115 |
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Sommario:
- Oceanographic parameters in continental margin of the State of Ceará (Northeastern Brazil) deduced from C and O isotopes in foraminifers Wanessa Sousa Marques Eldemar De A. Menor Valdir A.V. Manso Satander S. Freire Alcides N. Sial Multidisciplinaria (Ciencias Naturales y Exactas) Ceará Brazil foraminifers continental margin carbon and oxygen isotopes Specimens of Recent foraminifera of Amphistegina radiata, Peneroplis planatus and Globigerinoides ruber, from fiftysamples of surface sediments of the continental margin of the State of Ceará, Brazil, have been analyzed for carbon andoxygen isotopes to investigate oceanographic parameters and determine the values of δ18O of the oceanic water. Froma comparison between values of δ18O obtained for ocean water using the linear equations by (Craig and Gordon 1965)and the one by Wolff et al. (1998), it became evident that the former yielded a more reliable value (0.2◦/◦◦ SMOW)than the latter. Lower values of δ18O for the ocean water in this continental margin resulted from continental waterinfluence. Values of 18O (−0.3◦/◦◦ to −1.5◦/◦◦ PDB for benthic foraminifera and −0.6◦/◦◦ to −2.4◦/◦◦ PDB forplanktic foraminifera), attest to a variation of temperatures of oceanic water masses, in average, between 20 to 22◦C indeep water and 24 to 27◦C, in surface water. Values of δ13C from +3.2◦/◦◦ to −0.2◦/◦◦ PDB (benthic foraminifera)reflect a variation in the apparent oxygen utilization (AOU) in the continental margin and indicate that the environmentsof bacteriological decomposition of organic matter are not continuous along the investigated area. 2007 artículo científico 0001-3765 https://www.redalyc.org/articulo.oa?id=32779115 en http://www.redalyc.org/revista.oa?id=327 Anais da Academia Brasileira de Ciências application/pdf Academia Brasileira de Ciências Anais da Academia Brasileira de Ciências (Brasil) Num.1 Vol.79