Biochronostratigraphy of the western equatorial Atlantic for the last 1.93 Ma

Author(s)

Ferreira, Fabricio ^{[1, 2]} ; Silva, Cleverson G. ^[2] ; Oliveira, Allan S. ^[2] ; Chiessi, Cristiano M. ^[3] ; Kern, Andrea K. ^[4] ; Baker, Paul A. ^[5] ; Dwyer, Gary ^[5] ; Rigsby, Catherine A. ^[6] ; Huang, Enqing ^[7] ; Tian, Jun ^[7]

Affiliation

^[1] Univ Fed Fluminense, Inst Geosci, Postgrad Program Ocean & Earth Dynam, Av Gal Milton Tavares de Souza S-N, BR-24210346 Niteroi, RJ - Brazil

^[2] Univ Fed Fluminense, Inst Geosci, Marine Geol Lab LAGEMAR, Av Gal Milton Tavares de Souza S-N, BR-24210346 Niteroi, RJ - Brazil

^[3] Univ Sao Paulo, Sch Arts Sci & Humanities, Av ArlindoBettio 1000, BR-03828000 Sao Paulo, SP - Brazil

^[4] Univ Sao Paulo, Inst Geosci, Dept Sedimentary & Environm Geol, Rua Lago 562, BR-05508080 Sao Paulo, SP - Brazil

^[5] Duke Univ, Div Earth & Ocean Sci, Durham, NC 27708 - USA

^[6] East Carolina Univ, Dept Geol Sci, Greenville, NC 27858 - USA

^[7] Tongji Univ, State Key Lab Marine Geol, 1239 Siping Rd, Shanghai 200092 - Peoples R China

• Document type: Journal article
• Source: QUATERNARY INTERNATIONAL; v. 598, p. 24-37, OCT 10 2021.
• Web of Science Citations: 0

Abstract

Planktonic foraminifera are an important biochronostratigraphic tool and one of the main proxies used in paleoceanographic studies. Here we present the integration of quantitative analyses of planktonic foraminifera biostratigraphy, planktonic and benthic foraminifera oxygen isotopic data, and planktonic foraminifera radiocarbon ages in a biochronostratigraphic framework for the last 1.93 Ma of the western equatorial Atlantic. The ages of the biostratigraphic events derived from our records are consistent with previous works except for the highest occurrences of Globigerinoidesella fistulosa (similar to 1.82 Ma; MIS 66), Globigerinoides obliquus (similar to 1.48 Ma; MIS 49), Globorotalia tosaensis (similar to 1.05 Ma; MIS 31), and G. viola (similar to 0.34 Ma; MIS 10). The largest difference in age (similar to 1.13 Ma) was found for the highest occurrence of G. viola. In addition, we describe for the first time in the equatorial and western South Atlantic the oldest Pleistocene Globorotalia menardii disappearance (D) and reappearance (R) events D5 (similar to 1.79 Ma; MIS 64), R5 (similar to 1.68 Ma; MIS 60), D4 (similar to 1.05 Ma; MIS 30) and R4 (similar to 0.96 Ma; MIS 26). Our records present a consistent difference in the ages of G. menardii D and R events compared to the North and South Atlantic. While the onset of D events occurs initially at high latitudes and later in the equatorial region, the timing of R events exhibit the opposite trend. The oscillations in abundance of the complexes Pulleniatina and Globorotalia crassaformis together with the species Globorotalia truncatulinoides and Globoconella inflata allowed the subdivision of the last 1.93 Ma into 20 subzones, substantially improving the biochronostratigraphic resolution for the western equatorial Atlantic. (AU)

• FAPESP's process: 14/05582-0 - The Amazonian biota structure and evolution and its environment: Amazon Basin paleobotany and palynology
• Grantee: Andrea Kern
• Support Opportunities: Scholarships in Brazil - Post-Doctoral
• FAPESP's process: 19/24349-9 - Assessing the effects of past and future climate change on Amazonian biodiversity (CLAMBIO)
• Grantee: Cristiano Mazur Chiessi
• Support Opportunities: BIOTA-FAPESP Program - Regular Research Grants
• FAPESP's process: 18/15123-4 - Past perspectives on tipping elements of the climate system: the Amazon Rainforest and the Atlantic Meridional Overturning Circulation (PPTEAM)
• Grantee: Cristiano Mazur Chiessi
• Support Opportunities: Research Grants - Research Program on Global Climate Change - Young Investigators - Phase 2
• FAPESP's process: 15/18314-7 - Pollen-based vegetation reconstruction during the last glacial interglacial-cycles from Western Tropical Atlantic marine cores
• Grantee: Andrea Kern
• Support Opportunities: Scholarships abroad - Research Internship - Post-doctor