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Diagenetic effect on magnetic properties of marine core sediments from the southern Okhotsk Sea

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Abstract

It is well known that magnetic records of marine sediments are affected to a certain degree by early diagenesis, the extent and mode of which are controlled by depositional environments. In order to investigate variations in the effects of early diagenesis, we have analyzed 11 gravity cores estimated to be Holocene in age that constitute a depth transect off the southern coast of the Okhotsk Sea. The rock magnetic parameters have peaks produced by the presence of volcanic ashes, basaltic granules and/or relatively coarser-grained layers. The concentration-dependent parameters display characteristic trends of a rapid decrease within the homogeneous silty clay zone in the middle parts of the cores, assuming that the total amount of magnetic minerals decreases through early diagenesis at this interval. This decrease is found in all of the cores from the transect (from both near-shore and offshore sites). In near-shore sites where larger volumes of organic materials are supplied compared to offshore sites, the depth of the decrease in magnetic minerals is relatively shallow. These results imply that the presence of organic materials accelerates the pyritization through the bacterial reduction of ferric ion, thereby causing the decreases in magnetic minerals to become shallower.

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Correspondence to Noriko Kawamura.

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Kawamura, N., Oda, H., Ikehara, K. et al. Diagenetic effect on magnetic properties of marine core sediments from the southern Okhotsk Sea. Earth Planet Sp 59, 83–93 (2007) doi:10.1186/BF03352680

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Key words

  • Rock magnetic parameters
  • early diagenesis
  • magnetite
  • hematite
  • selective dissolution