Serravallian shales in the Monte dei Corvi pelagic sequence (Ancona, Italy): an organic geochemical perspective

B. A. Stankiewicz, A. Montanari

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Abstract

In addition to the predominant marly lithologies, the Serravallian-Tortonian sequence at Monte dei Corvi (MDC), south of Ancona, Italy, contains at least 85 thin, dark calcareous shales. Sixteen of the Serravalian shales were sampled for a preliminary organic geochemical evaluation. All the MDC shales appear to have been deposited during periodic anoxic events, as demonstrated by the presence of significant quantities of organic matter and authigenic pyrite. The degree of anoxicity appears to have differed from one event to the next. While the quantity of organic matter preserved is highly variable, the type is remarkably consistent from sample to sample as evidenced both by analytical pyrolysis-gas chromatography/mass spectrometry (GC/MS) of the solid organic matter and by the GC/MS analysis of the extractable material. This implies a regeneration of similar microflora/microbial assemblages and depositional conditions during each anoxic event. -from Authors

Original languageEnglish
Pages (from-to)173-182
Number of pages10
JournalGiornale di Geologia
Volume56
Issue number1
StatePublished - Jan 1 1994

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All Science Journal Classification (ASJC) codes

  • Geology
  • Oceanography

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