(Table 1) Strontium isotope ratios of planktonic foraminifera and ostracoda from ODP Hole 120-748B on the Kerguelen Plateau, Indian Ocean, supplement to: Zachos, James C; Opdyke, Bradley N; Quinn, Terrence Michael; Jones, Charles E; Halliday, Alex N (1999): Early cenozoic glaciation, antarctic weathering, and seawater 87Sr/86Sr: is there a link? Chemical Geology, 161(1-3), 165-180

Stable and radiogenic isotopic and sedimentological data from sub-Antarctic deep sea sediment cores reveal a temporal link between changes in seawater 87Sr/86Sr ratios and major episodes of late Eocene-early Oligocene climate change. The 87Sr/86Sr records show two major inflections, one at 38-39 Ma...

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Bibliographic Details
Main Authors: Zachos, James C, Opdyke, Bradley N, Quinn, Terrence Michael, Jones, Charles E, Halliday, Alex N
Format: Dataset
Language:English
Published: PANGAEA - Data Publisher for Earth & Environmental Science 1999
Subjects:
DEPTH, sediment/rock
Sample code/label
Sample type
Strontium-87/Strontium-86
Strontium-87/Strontium-86, error
Drilling/drill rig
DSDP/ODP/IODP sample designation
Leg120
Joides Resolution
Ocean Drilling Program ODP
Antarctic
Kerguelen
Indian
Halliday
Antarc*
Antarctica
Planktonic foraminifera
Online Access:https://dx.doi.org/10.1594/pangaea.695370
https://doi.pangaea.de/10.1594/PANGAEA.695370
Description
Summary:Stable and radiogenic isotopic and sedimentological data from sub-Antarctic deep sea sediment cores reveal a temporal link between changes in seawater 87Sr/86Sr ratios and major episodes of late Eocene-early Oligocene climate change. The 87Sr/86Sr records show two major inflections, one at 38-39 Ma near the middle/late Eocene boundary, followed by another at 33.4 Ma. Similarly, the oxygen isotope, ice-rafted debris, and clay assemblage records indicate two important climatic events: the appearance of alpine glaciers and/or small ice-sheets on Antarctica in the late Eocene at 38-39 Ma, followed by a rapid transition to larger and more permanent temperate ice-sheets in the early Oligocene at 33.4 Ma. Moreover, during the early Oligocene 30-33 Ma. three to four inferred peaks in glacial activity appear to coincide with subtle steps in the 87Sr/86Sr record. The coupled variations in climate and seawater Sr isotope ratios during the Eocene/Oligocene imply a strong causal link between the two. Either changes in climate directly influenced patterns of continental weathering and hence seawater chemistry, and/or a tectonic event e.g., uplift.as reflected in weathering and seawater chemistry triggered relatively abrupt changes in global climate.

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