Roberto Silva Jr , Elisabetta Erba , Aristóteles de Moraes Rios-Netto , Silvia Clara Silva , Thamara Daniel Alves , André Luiz Gatto Motta , Bruno Valle , Leonardo Borghi , Frances Abbots-Queiroz
{"title":"巴西Sergipe-Alagoas盆地的海洋缺氧事件2:钙质超微化石组合的新古生态学见解","authors":"Roberto Silva Jr , Elisabetta Erba , Aristóteles de Moraes Rios-Netto , Silvia Clara Silva , Thamara Daniel Alves , André Luiz Gatto Motta , Bruno Valle , Leonardo Borghi , Frances Abbots-Queiroz","doi":"10.1016/j.marmicro.2022.102197","DOIUrl":null,"url":null,"abstract":"<div><p>A boring core (UFRJ-2-LRJ-01-SE) from the Sergipe-Alagoas Basin, Brazil, is one of the best and most expanded sections of the late Albian–early Turonian<span><span> age within South America and includes one of the few records of Oceanic Anoxic Event 2 (OAE 2) in the South Atlantic Ocean. The aim of this study is to revise the calcareous nannofossil<span> biostratigraphy and reconstruct paleoclimatic-paleoceanographic patterns based on the quantitative analysis of nannofossil assemblages performed on 78 samples throughout the core UFRJ-2-LRJ-01-SE. The biostratigraphic revision corroborates the previously defined late Albian–early Turonian age for the studied section, however, a hiatus (∼ 4.7 Ma) has been identified, omitting the latest Albian–early </span></span>Cenomanian<span><span> time interval including OAE 1d. In addition, we confirm the occurrence of the OAE 2 interval within the studied section. Also, the revised nannofossil biostratigraphy integrated with chemostratigraphy pointed out the presence of the Middle Cenomanian Event (MCE), previously identified as the Lower Cenomanian Anoxic Event (LCAE). The relative abundances of selected calcareous nannofossil taxa suggest a prevalence of warmer surface waters during the late </span>Albian<span> and cooler conditions during the middle Cenomanian–early Turonian. The integration of diversity, species richness, Shannon diversity, equitability, nutrients (NI) and temperature (TI) indices separated four intervals recording different paleoecological conditions. The comparison with western Tethys data shows similarity between the temperature and fertility trends recognized in the studied section, suggesting global climate changes and similar fluctuations in ocean fertility during the late Albian–early Turonian.</span></span></span></p></div>","PeriodicalId":49881,"journal":{"name":"Marine Micropaleontology","volume":"178 ","pages":"Article 102197"},"PeriodicalIF":1.5000,"publicationDate":"2023-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":"{\"title\":\"Oceanic anoxic event 2 in Sergipe-Alagoas Basin, Brazil: New paleoecological insights from calcareous nannofossils assemblages\",\"authors\":\"Roberto Silva Jr , Elisabetta Erba , Aristóteles de Moraes Rios-Netto , Silvia Clara Silva , Thamara Daniel Alves , André Luiz Gatto Motta , Bruno Valle , Leonardo Borghi , Frances Abbots-Queiroz\",\"doi\":\"10.1016/j.marmicro.2022.102197\",\"DOIUrl\":null,\"url\":null,\"abstract\":\"<div><p>A boring core (UFRJ-2-LRJ-01-SE) from the Sergipe-Alagoas Basin, Brazil, is one of the best and most expanded sections of the late Albian–early Turonian<span><span> age within South America and includes one of the few records of Oceanic Anoxic Event 2 (OAE 2) in the South Atlantic Ocean. The aim of this study is to revise the calcareous nannofossil<span> biostratigraphy and reconstruct paleoclimatic-paleoceanographic patterns based on the quantitative analysis of nannofossil assemblages performed on 78 samples throughout the core UFRJ-2-LRJ-01-SE. The biostratigraphic revision corroborates the previously defined late Albian–early Turonian age for the studied section, however, a hiatus (∼ 4.7 Ma) has been identified, omitting the latest Albian–early </span></span>Cenomanian<span><span> time interval including OAE 1d. In addition, we confirm the occurrence of the OAE 2 interval within the studied section. Also, the revised nannofossil biostratigraphy integrated with chemostratigraphy pointed out the presence of the Middle Cenomanian Event (MCE), previously identified as the Lower Cenomanian Anoxic Event (LCAE). The relative abundances of selected calcareous nannofossil taxa suggest a prevalence of warmer surface waters during the late </span>Albian<span> and cooler conditions during the middle Cenomanian–early Turonian. The integration of diversity, species richness, Shannon diversity, equitability, nutrients (NI) and temperature (TI) indices separated four intervals recording different paleoecological conditions. 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Oceanic anoxic event 2 in Sergipe-Alagoas Basin, Brazil: New paleoecological insights from calcareous nannofossils assemblages
A boring core (UFRJ-2-LRJ-01-SE) from the Sergipe-Alagoas Basin, Brazil, is one of the best and most expanded sections of the late Albian–early Turonian age within South America and includes one of the few records of Oceanic Anoxic Event 2 (OAE 2) in the South Atlantic Ocean. The aim of this study is to revise the calcareous nannofossil biostratigraphy and reconstruct paleoclimatic-paleoceanographic patterns based on the quantitative analysis of nannofossil assemblages performed on 78 samples throughout the core UFRJ-2-LRJ-01-SE. The biostratigraphic revision corroborates the previously defined late Albian–early Turonian age for the studied section, however, a hiatus (∼ 4.7 Ma) has been identified, omitting the latest Albian–early Cenomanian time interval including OAE 1d. In addition, we confirm the occurrence of the OAE 2 interval within the studied section. Also, the revised nannofossil biostratigraphy integrated with chemostratigraphy pointed out the presence of the Middle Cenomanian Event (MCE), previously identified as the Lower Cenomanian Anoxic Event (LCAE). The relative abundances of selected calcareous nannofossil taxa suggest a prevalence of warmer surface waters during the late Albian and cooler conditions during the middle Cenomanian–early Turonian. The integration of diversity, species richness, Shannon diversity, equitability, nutrients (NI) and temperature (TI) indices separated four intervals recording different paleoecological conditions. The comparison with western Tethys data shows similarity between the temperature and fertility trends recognized in the studied section, suggesting global climate changes and similar fluctuations in ocean fertility during the late Albian–early Turonian.
期刊介绍:
Marine Micropaleontology is an international journal publishing original, innovative and significant scientific papers in all fields related to marine microfossils, including ecology and paleoecology, biology and paleobiology, paleoceanography and paleoclimatology, environmental monitoring, taphonomy, evolution and molecular phylogeny. The journal strongly encourages the publication of articles in which marine microfossils and/or their chemical composition are used to solve fundamental geological, environmental and biological problems. However, it does not publish purely stratigraphic or taxonomic papers. In Marine Micropaleontology, a special section is dedicated to short papers on new methods and protocols using marine microfossils. We solicit special issues on hot topics in marine micropaleontology and review articles on timely subjects.