Cenozoic Mg/Ca ratios in benthic foraminiferal calcite with BWT and sea ice volume reconstruction ...

A deep-sea temperature record for the past 50 million years has been produced from the magnesium/calcium ratio (Mg/Ca) in benthic foraminiferal calcite. The record is strikingly similar in form to the corresponding benthic oxygen isotope (δ18O) record and defines an overall cooling of about 12°C in...

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Bibliographic Details
Main Authors: Lear, Caroline H, Elderfield, Henry, Wilson, Paul A
Format: Article in Journal/Newspaper
Language:English
Published: PANGAEA 2020
Subjects:
Cenozoic temperature ice volume Mg/Ca
Deep Sea Drilling Project DSDP
Ocean Drilling Program ODP
Antarc*
Antarctic
Sea ice
Online Access:https://dx.doi.org/10.1594/pangaea.913867
https://doi.pangaea.de/10.1594/PANGAEA.913867
Description
Summary:A deep-sea temperature record for the past 50 million years has been produced from the magnesium/calcium ratio (Mg/Ca) in benthic foraminiferal calcite. The record is strikingly similar in form to the corresponding benthic oxygen isotope (δ18O) record and defines an overall cooling of about 12°C in the deep oceans with four main cooling periods. Used in conjunction with the benthic δ18O record, the magnesium temperature record indicates that the first major accumulation of Antarctic ice occurred rapidly in the earliest Oligocene (34 million years ago) and was not accompanied by a decrease in deep-sea temperatures. ...

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