Mössbauer Study of Glauconites from Poland

A. Kotlicki, J. Szczyrba* and A. Wiewióra*
Institute of Experimental Physics, Warsaw University, 00-681 Warsaw
* Institute of Geological Sciences, Polish Academy of Sciences, 02-089 Warsaw, Poland

Abstract: Four bands occur in the Mössbauer spectra of pelletal glauconites ranging in age from Cambrian to Oligocene. Components due to Fe3+ in the cis M(2) positions are visible in all the spectra but their shapes depend on the expanding layer content. In the spectrum of the Oligocene glauconite a very well-developed shoulder due to Fe2+ in the trans M(1) positions is observed. In the younger glauconites (15–20% expanding layers) the conventional assignments of the spectra indicate that Fe2+ occupies the trans M(1) positions, the cis M(2) positions being vacant. Conversely, in the Palaeozoic samples (∼5% expanding layers) the cis occupancy significantly prevails over trans occupancy.

Clay Minerals; September 1981 v. 16; no. 3; p. 221-230; DOI: 10.1180/claymin.1981.016.3.01
© 1981, The Mineralogical Society
Mineralogical Society (www.minersoc.org)