Pyritization of fossil mollusk shells and some problems of supergene sulfide formation

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• 作者：L. Ya. Kizil’shtein
• 刊名：Lithology and Mineral Resources
• 出版年：2006
• 出版时间：December, 2006
• 年：2006
• 卷：41
• 期：6
• 页码：570-575
• 全文大小：277 KB
• 刊物类别：Earth and Environmental Science
• 刊物主题：Earth sciences
  Mineral Resources
  Mineralogy
  Sedimentology
  Russian Library of Science
  
• 出版者：MAIK Nauka/Interperiodica distributed exclusively by Springer Science+Business Media LLC.
• ISSN：1608-3229

文摘

The study of specific features of the pyritization of mollusk fossil shells has provided new evidence of the relationship between the generation of hydrosulfides during the bacterial reduction of sulfates and the composition of organic matter (OM) exploited by bacteria in processes of metabolism. The OM is represented by conchiolin of the ammonite shell frustule. Interaction between the bacterial H₂S and Fe2+ fosters the pseudomorphous replacement of conchiolin by the colloidal iron monosulfide that is subsequently transformed into pyrite. Hydrogen sulfide and/or monosulfide migrate into diagenetic cracks and cavities formed in the clayey—carbonate matrix that fills up the interior cavity of a shell. We believe that the data reported in this communication should be taken into consideration in the study of formation constraints of vein and disseminated sulfide mineralization in sedimentary rocks during the early diagenesis and related problems of ore formation.