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Magnetic intensity loss and core diagenesis in long-core samples from the East Cortez Basin and the San Nicolas Basin (California Borderland)

Earth, Planets and Space volume 51, pages 329–336 (1999)Cite this article

Abstract

We performed high resolution magnetic measurements on about 180 m of continuous U-channel samples from Sites 1012 (East Cortez Basin) and 1013 (San Nicolas Basin) that were recovered during Ocean Drilling Program Leg 167 to the California Margin. Measurements were made at 1–2 cm intervals from near-complete composite stratigraphic sequences at both of the studied sites with the goal of obtaining high spatial resolution of sediment magnetic properties, including detailed characterization of variations in magnetic mineralogy, concentration, and grain size. The decay of a metastable magnetic mineral or the dissolution of fine-grained magnetite by organic matter reduction had strongly affected both cores, reducing the magnetic intensity to 7%–10% of the initial magnetization. Measurements were carried out ca. 4–6 months after the cores were drilled. Despite the reduced magnetic signal we were able to define a stable characteristic remanence for most of the core. Cyclic variations that were observed over short and long stratigraphic intervals are strongly driven at Earth orbital periodicities and have been used to obtain a detailed age model based on comparison with the insolation record.

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Author notes

  1. Yohan Guyodo

    Present address: Department of Geology, University of Florida, Gainesville, FL, 32611, USA

Authors and Affiliations

  1. Ocean Drilling Program, Texas A&M University, 1000 Discovery Drive, College Station, TX, 77845-9547, USA

    Carl Richter

  2. Science and Engineering Research Institute, Doshisha University, Kyoto, 610-0321, Japan

    Akira Hayashida

  3. Institut de Physique du Globe de Paris, 4, Place Jussieu, 75252, Paris Cedex 05, France

    Yohan Guyodo & Jean-Pierre Valet

  4. Geology Department, University of California, Davis, CA, 95616, USA

    Kenneth L. Verosub

Authors
  1. Carl Richter
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  2. Akira Hayashida
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  3. Yohan Guyodo
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  4. Jean-Pierre Valet
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  5. Kenneth L. Verosub
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Correspondence to Carl Richter.

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Richter, C., Hayashida, A., Guyodo, Y. et al. Magnetic intensity loss and core diagenesis in long-core samples from the East Cortez Basin and the San Nicolas Basin (California Borderland). Earth Planet Sp 51, 329–336 (1999). https://doi.org/10.1186/BF03352237

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  • DOI: https://doi.org/10.1186/BF03352237

Keywords

  • Magnetite
  • Magnetic Intensity
  • Ocean Drill Program
  • Natural Remanent Magneti
  • Error Angle