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On the palaeomagnetic and rock magnetic constraints regarding the age of IODP 325 Hole M0058A

By
Emilio Herrero-Bervera
Emilio Herrero-Bervera
Hawaii Institute of Geophysics and Planetology, University of Hawaii, Honolulu, HI 96822, USA
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Luigi Jovane
Luigi Jovane
Department of Geology, Western Washington University, Bellingham, WA 98225, USAInstituto Ocenográfico, Universidade de São Paulo, São Paulo 05508-120, Brazil
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Published:
January 01, 2013

Abstract

We have studied the rock magnetic and palaeomagnetic properties of a 41 m long core (Hole M0058A) recovering calcareous sediments located seaward of Noggin Reef, offshore Queensland, Australia to decipher the magnetostratigrapy of the site. We deployed 1 cm3 samples at every 10 cm down-core and subsampled the core by means of U-channels in order to obtain a continuous record. Stepwise alternating field demagnetization from natural remanent magnetization to 80 mT showed that the characteristic remanent magnetization was isolated at low demagnetization fields between 0 and 15 mT. We conducted magnetic granulometry analyses and Curie point determinations. The low-field v. temperature analyses indicate the presence of Ti-poor magnetite with Curie points from 560 to 563 °C. Hysteresis loop experiments were performed. The results show Mrs/Ms and Hcr/Hc ratios corresponding to single domain to multi-domain and super-paramagnetic to single domain ranges. Both discrete and continuous inclination results indicate a remarkable correlation of three excursional inclinations occurring during intervals of low intensity of magnetization closely corresponding to the Laschamp (c. 41 ka), Skálamælifell (c. 94 ka) and Blake (c. 115–120 ka) ‘aborted reversals,’ and indicate that the base of the core is much older than the Blake excursion.

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Contents

Geological Society, London, Special Publications

Magnetic Methods and the Timing of Geological Processes

L. Jovane
L. Jovane
Universidade de Saão Paulo, Brazil
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E. Herrero-Bervera
E. Herrero-Bervera
University of Hawaii at Manoa, USA
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L.A. Hinnov
L.A. Hinnov
Johns Hopkins University, USA
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B. Housen
B. Housen
Western Washington University, USA
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Geological Society of London
Volume
373
ISBN electronic:
9781862396364
Publication date:
January 01, 2013

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