Calcareous nannoplankton assemblages recording the Pliocene-Pleistocene transition at the Indian-Atlantic Ocean gateway, IODP Site U1475

Author(s): Cares, Zoe
Author Affiliation(s): Primary:
Texas A&M University, College Station, TX, United States
Volume Title: May 2018 virtual poster showcase, American Geophysical Union
Volume Author(s): Shamberger, Kathryn
Source: Virtual Poster Showcase, Vol.9; American Geophysical Union 2018 virtual poster showcase, Washington, DC, May, 2018. Publisher: American Geophysical Union, Washington, DC, United States
Note: In English
Summary: In geologic history, the Pliocene-Pleistocene transition (PPT) was a period where the warm Pliocene climate ended with abrupt global cooling, and was followed by a cooler Pleistocene climate. The Pliocene was even warmer than Earth's climate today, and had even higher levels of atmospheric pCO2. If scientists have a better understanding of the PPT, we will have a better understanding of our current climate and will be better equipped to predict future climates. The PPT is hypothesized to be a result of a high-latitude response to decreasing atmospheric carbon dioxide levels and was marked by significant Northern Hemisphere glaciation at about 2.7 million years ago (Ma), as well as expansion of the Antarctic ice sheets. Expedition 361 Site U1475 was cored by the International Ocean Discovery Program (IODP) on the southwestern flank of the Agulhas Plateau (41°25.61'S; 25°15.64'E), from a water depth of 2,669m. The area is known as the Indian-Atlantic Ocean Gateway (IAOG), and studying this site is necessary because the circulation system here has the potential to influence climate on a global scale. Paleoclimate as a study has evolved over the past few decades. Site U1475 remains unique in its location and research methods. Studying this site allows for scientists to determine if the expansion of Antarctic ice sheets have impacted Southern Ocean Circulation by restricting the Agulhas Current from flowing into the Atlantic (McKay et al., 2012). In this way, the goal is to fine-tune past research with new technology and information, and have a better understanding of non-anthropogenic causes of climate change.
Year of Publication: 2018
Research Program: IODP Integrated Ocean Drilling Program
IODP2 International Ocean Discovery Program
Key Words: 12 Stratigraphy, Historical Geology and Paleoecology; Agulhas Plateau; Assemblages; Atlantic Ocean; Cenozoic; Expedition 361; IODP Site U1475; Indian Ocean; International Ocean Discovery Program; Microfossils; Nannofossils; Nannoplankton; Neogene; Paleo-oceanography; Paleoclimatology; Plankton; Pleistocene; Pliocene; Quaternary; Tertiary
Coordinates: S412537 S412536 E0251540 E0251538
Record ID: 2018052945
Copyright Information: GeoRef, Copyright 2019 American Geosciences Institute.