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Abstract <p>The article presents the results of a study by analytical methods of the mineral and chemical composition of sediments from the 626-m-deep Hole DSDP 474/474A, and their alterations in contact zones with basalt sills. Jarosite, bassanite and anhydrite were formed in the sediments from these zones. In sediments located above the sill, the thickness of which is 6.73 m, the concentration of Mn and Mo decreased from a weak level of alteration to a strong one when approaching the roof of the sill. In sediments located above the sill with a thickness of 9.73 m, closer to its roof, the Mn and P concentration decreased. In these sediments, the quantity of trace elements, the content of which has changed, has become greater than in the sediments located above the 6.73-m-thick sill. In sediments between 4-m-thick pillow basalts and 11.97-m-thick massive basalt, a decrease in the Mo, Cd, and Sb concentrations occurred with the average alteration intensity. Sills of different thicknesses from Hole 474/474A had a limited effect on the mineral and chemical composition of the host sediments, in contrast to the significant influence of hot sills from Holes 478 and 481/481A (Guaymas Basin) on the composition of sediments.</p>

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Alterations of Terrigenous Sediments in Contact Zones with Basalts (Mouth of the California Gulf, Hole DSDP 474/474A)

  • 期刊论文

  • 发表日期：

    2025年8月1日

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  • V. B. Kurnosov,
  • E. O. Goncharov,
  • B. A. Sakharov,
  • V. A. Drits,
  • O. V. Okina,
  • Yu. A. Maksimova

摘要

Abstract

The article presents the results of a study by analytical methods of the mineral and chemical composition of sediments from the 626-m-deep Hole DSDP 474/474A, and their alterations in contact zones with basalt sills. Jarosite, bassanite and anhydrite were formed in the sediments from these zones. In sediments located above the sill, the thickness of which is 6.73 m, the concentration of Mn and Mo decreased from a weak level of alteration to a strong one when approaching the roof of the sill. In sediments located above the sill with a thickness of 9.73 m, closer to its roof, the Mn and P concentration decreased. In these sediments, the quantity of trace elements, the content of which has changed, has become greater than in the sediments located above the 6.73-m-thick sill. In sediments between 4-m-thick pillow basalts and 11.97-m-thick massive basalt, a decrease in the Mo, Cd, and Sb concentrations occurred with the average alteration intensity. Sills of different thicknesses from Hole 474/474A had a limited effect on the mineral and chemical composition of the host sediments, in contrast to the significant influence of hot sills from Holes 478 and 481/481A (Guaymas Basin) on the composition of sediments.