A sedimentary paleomagnetic record of the Matuyama chron from the Western Antarctic margin (ODP Site 1101)

Yohan Guyodo, Gary D. Acton, Stefanie Brachfeld, James E.T. Channell

Research output: Contribution to journalArticle

27 Citations (Scopus)

Abstract

A high-resolution paleomagnetic record for part of the Matuyama chron (0.7-2.1 Ma) is reported for Ocean Drilling Program Site 1101 (Leg 178), off the Antarctic Peninsula Pacific margin. A rock-magnetic investigation of 62 discrete samples revealed that the natural remanent magnetization (NRM) is carried by pseudo-single domain magnetite. Progressive alternating field demagnetization of 83 m of U-channels provided a polarity stratigraphy down to the Olduvai subchron. Two geomagnetic events preceding the Jaramillo subchron were identified, including the Cobb Mountain polarity interval. The bulk magnetic parameters vary by more than a factor of 20 over the entire time interval, but by less than a factor of 6 over the 0.7-1.1 Ma interval. This latter interval was selected for paleointensity determinations, which were carried out by normalizing the NRM by the anhysteretic remanent magnetization (ARM). Direct comparison of the Site 1101 paleointensity record with other curves available for the same time interval suggests a geomagnetic origin for features present in the record. A more quantitative comparison was achieved by means of a jackknife test performed on nine records of relative paleointensity over the 0.95-1.1 Ma interval. This test yielded no outlier for the period considered, confirming the geomagnetic character of the records. We have constructed a low-resolution stack revealing some of the characteristic paleointensity features of the Jaramillo subchron.

Original languageEnglish
Pages (from-to)61-74
Number of pages14
JournalEarth and Planetary Science Letters
Volume191
Issue number1-2
DOIs
StatePublished - 16 Oct 2001

Fingerprint

Matuyama chron
Ocean Drilling Program
margins
Magnetization
intervals
natural remanent magnetization
Ferrosoferric Oxide
Demagnetization
Stratigraphy
magnetization
Drilling
polarity
Olduvai event
Rocks
demagnetization
remanent magnetization
outlier
normalizing
stratigraphy
peninsulas

Keywords

  • Antarctic Peninsula
  • Magnetic intensity
  • Magnetostratigraphy
  • Paleomagnetism

Cite this

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abstract = "A high-resolution paleomagnetic record for part of the Matuyama chron (0.7-2.1 Ma) is reported for Ocean Drilling Program Site 1101 (Leg 178), off the Antarctic Peninsula Pacific margin. A rock-magnetic investigation of 62 discrete samples revealed that the natural remanent magnetization (NRM) is carried by pseudo-single domain magnetite. Progressive alternating field demagnetization of 83 m of U-channels provided a polarity stratigraphy down to the Olduvai subchron. Two geomagnetic events preceding the Jaramillo subchron were identified, including the Cobb Mountain polarity interval. The bulk magnetic parameters vary by more than a factor of 20 over the entire time interval, but by less than a factor of 6 over the 0.7-1.1 Ma interval. This latter interval was selected for paleointensity determinations, which were carried out by normalizing the NRM by the anhysteretic remanent magnetization (ARM). Direct comparison of the Site 1101 paleointensity record with other curves available for the same time interval suggests a geomagnetic origin for features present in the record. A more quantitative comparison was achieved by means of a jackknife test performed on nine records of relative paleointensity over the 0.95-1.1 Ma interval. This test yielded no outlier for the period considered, confirming the geomagnetic character of the records. We have constructed a low-resolution stack revealing some of the characteristic paleointensity features of the Jaramillo subchron.",
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A sedimentary paleomagnetic record of the Matuyama chron from the Western Antarctic margin (ODP Site 1101). / Guyodo, Yohan; Acton, Gary D.; Brachfeld, Stefanie; Channell, James E.T.

In: Earth and Planetary Science Letters, Vol. 191, No. 1-2, 16.10.2001, p. 61-74.

Research output: Contribution to journalArticle

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