A possible link between the geomagnetic field and catastrophic climate at the Paleocene-Eocene Thermal Maximum

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doi: 10.1130/G30190A.1
Author(s): Lee, Youn Soo; Kodama, Kazuto
Author Affiliation(s): Primary:
Korea Institute of Geoscience and Mineral Resources, Geological Research Division, Daejon, South Korea
Other:
Kochi University, Japan
Volume Title: Geology (Boulder)
Source: Geology (Boulder), 37(11), p.1047-1050. Publisher: Geological Society of America (GSA), Boulder, CO, United States. ISSN: 0091-7613 CODEN: GLGYBA
Note: In English. With GSA Data Repository Item 2009263. 27 refs.; illus.
Summary: We report high-precision records of a magnetic reversal event at the Paleocene-Eocene thermal maximum (PETM), a cataclysmic global warming event initiated at 55.0 Ma. This event is confirmed by both an antipodal shift in direction and a reduction in magnetic intensity during the lower and upper transitions, and it is seen at additional sites, indicating that the characteristic remanent magnetization (ChRM) was primarily acquired by Earth's magnetic field during sedimentation. This major fluctuation of Earth's magnetic field intensity is interpreted to have been linked to the PETM and to have eventually facilitated the reversal. This Paleocene-Eocene magnetic reversal (PEMR) lasted for approximately 53 ka, from 54.964 to 54.911 Ma, but finally recovered to an original polarity. This suggests a possible coupling between Earth's core magnetofluid dynamo sphere and the atmosphere-hydrosphere during an abrupt catastrophic climate event.
Year of Publication: 2009
Research Program: ODP Ocean Drilling Program
Key Words: 12 Stratigraphy, Historical Geology and Paleoecology; Atlantic Ocean; Catastrophes; Cenozoic; Characteristic remanent magnetization; Climate change; Global change; Global warming; Leg 208; Magnetic field; Magnetic intensity; Magnetization; Magnetohydrodynamics; ODP Site 1262; Ocean Drilling Program; Paleocene-Eocene Thermal Maximum; Paleoclimatology; Paleogene; Paleomagnetism; Paleotemperature; Remanent magnetization; Reversals; South Atlantic; Tertiary; Walvis Ridge
Coordinates: S271100 S271100 E0013500 E0013400
Record ID: 2009100355
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