(Table 1) Geochemistry of the ETM-2 section from IODP Hole 302-M0004A

During the early Eocene, a series of short-term global warming events ("hyperthermals”) occurred in response to the rapid release of carbon into the oceans and atmosphere. In order to investigate the response of ocean redox to global warming, we have determined the molybdenum isotope compositio...

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Bibliographic Details
Main Authors: Dickson, Alexander J, Cohen, Anthony S
Format: Dataset
Language:English
Published: PANGAEA 2012
Subjects:
302-M0004A
ACEX-M4A
Arctic Coring Expedition
ACEX
Arctic Ocean
DEPTH
sediment/rock
DSDP/ODP/IODP sample designation
Exp302
Integrated Ocean Drilling Program / International Ocean Discovery Program
IODP
Iron oxide
Fe2O3
Molybdenum
Rhenium
Sample code/label
Titanium dioxide
Vidar Viking
δ13C
organic carbon
δ98/95Mo
standard deviation
Arctic
Global warming
Online Access:https://doi.pangaea.de/10.1594/PANGAEA.825453
https://doi.org/10.1594/PANGAEA.825453
Description
Summary:During the early Eocene, a series of short-term global warming events ("hyperthermals”) occurred in response to the rapid release of carbon into the oceans and atmosphere. In order to investigate the response of ocean redox to global warming, we have determined the molybdenum isotope compositions (d98/95Mo) of samples spanning one such hyperthermal (Eocene Thermal Maximum 2 (ETM-2, 54.1 Ma)), from Integrated Ocean Drilling Program Expedition 302 Site M0004A in the Arctic Ocean. The highest d98/95Mo in our sample set (2.00 ± 0.11 per mil) corresponds to the development of local euxinia at Site M0004A during the peak of ETM-2, which we interpret as recording the global seawater d98/95Mo at that time. The ETM-2 seawater d98/95Mo is indistinguishable from a recent estimate of seawater d98/95Mo from an earlier hyperthermal (Paleocene Eocene Thermal Maximum (PETM, 55.9 Ma), d98/95Mo = 2.08 ± 0.11 per mil). We argue that the similarity in seawater d98/95Mo during ETM-2 and the PETM was caused by the development of transient euxinia in the Arctic Ocean during each hyperthermal that allowed sediments accumulating in this basin to capture the long-term d98/95Mo of early Eocene seawater. Our new data therefore place a minimum constraint on the magnitude of transient global seafloor deoxygenation during early Eocene hyperthermals.

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