GLOBOROTALIA CRASSAFORMIS OPTIMUM EVENT: A NEW LATE QUATERNARY BIOSTRATIGRAPHIC MARKER FOR THE SOUTHEASTERN BRAZILIAN MARGIN

The integration of planktonic foraminiferal assemblage, oxygen stable isotope values, and AMS 14C dating allows a more precise chronology of biostratigraphic events recorded in cores GL-74 and GL-75 collected from Campos Basin (southeastern Brazil). This study documents that the third event of disap...

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Bibliographic Details
Published in:Palaios 2014-11, Vol.29 (11), p.578-593
Main Authors: DA COSTA PORTILHO-RAMOS, RODRIGO, FERREIRA, FABRICIO, LAGO, LAIS CARDOSO, DA SILVA, AIRTON GUSTAVO VIANA, JAWORSKI, KATIA SIMONE, DE TOLEDO, MAURO BEVILACQUA
Format: Article
Language:English
Subjects:
absolute age
assemblages
Atlantic Ocean
Biostratigraphy
biozones
Brazil
C-14
Campos Basin
carbon
Cenozoic
chemostratigraphy
cores
Foraminifera
Geochemistry
Geochronology
Globigerinacea
Globorotalia
Globorotalia crassaformis
Globorotaliidae
Invertebrata
isotope ratios
isotopes
marine environment
marine sediments
microfossils
O-18/O-16
Ocean currents
Oceans
Oxygen
Oxygen isotopes
Paleoclimatology
paleoenvironment
planktonic taxa
Pleistocene
Plexus
Protista
Pulleniatina
Pulleniatina obliquiloculata
quantitative analysis
Quaternary
Quaternary geology
radioactive isotopes
Radiocarbon
Rotaliina
Sand
Sediments
South America
South Atlantic
stable isotopes
upper Pleistocene
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Summary:The integration of planktonic foraminiferal assemblage, oxygen stable isotope values, and AMS 14C dating allows a more precise chronology of biostratigraphic events recorded in cores GL-74 and GL-75 collected from Campos Basin (southeastern Brazil). This study documents that the third event of disappearance of Pulleniatina plexus (Pulleniatina obliquiloculata biohorizon 3  =  YP.3) occurred simultaneously in Campos and Santos Basins around 43 ka. The results also show that the event of higher abundance of Globorotalia crassaformis, the so-called Globorotalia crassaformis Optimum Event (GcOE), occurred between ca. 84 and ca. 71 ka (ca. 13 ka duration), and was also simultaneous in both basins. This study supports the GcOE as an important biostratigraphic marker event in the southeastern Brazilian margin. We propose a revised subdivision of the last glacial Zone Y into subzones Y1, Y2, and Y3. Nevertheless, it is fundamental to establish the true geographic range, as well as building a more robust chronology for the GcOE, using other cores from other South Atlantic basins.
ISSN:0883-1351
1938-5323
DOI:10.2110/palo.2013.097