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    STUDIA GEOLOGIA - Ediţia nr.1 din 2007  
         
  Articol:   ISOTOPIC SIGNATURE OF LLANDOVERIAN OPEN MARINE BEDDED CHERTS FROM BARDO SYNCLINE, HOLY CROSS MOUNTAINS, CENTRAL POLAND: PRELIMINARY RESULTS.

Autori:  TOMASZ OCHMAŃSKI, DARIUSZ STRĄPOĆ, CRAIG MOORE, ARINDAM SARKAR. 		 
       
         
  Rezumat:  Layers of bedded cherts play a key role in paleoenvironmental reconstructions, because: (1) they precipitate either: syngenetically and/or during the early diagenesis stage, and (2) their preservation potential is very high. These features are especially important when examining older rocks (or sections) with comparably low preservation potential (e.g., fine grained sediments). Such a situation exists in the Bardo Syncline, in the Holy Cross Mountains, where bedded cherts are interlayered with siliceous clay-shales and mud-shales, the so-called “Silurian Graptolitic Shales” (SGS). Previous investigations of one of the authors, based on petrographic methods (Ochmański, 2006), led to the hypothesis of volcanic-activity-related genesis of these cherts. This paper shows the results of isotopic analysis of δ13C and δ18O, which strongly support this theory.  
         
     
         
         
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