Abstract
Mössbauer spectroscopic studies of two sedimentary layers from Petriccio section in Gubbio formation are presented. It is found that these layers have almost the same iron phases nanophase hematite and phyllosilicate and with the same compositions as those in the Cretaceous-Tertiary Boundary (KTB) in Petriccio. The two layers also show enhancement in the siderophile elements such as Cr, Ni, Fe, Ca etc. to that found in the KTB layer. The two layers are well separated from the KTB layer, 128 and 149 cm below this layer, and show no enhancement of iridium. From the data it is suggested that the two layers also represent some kind of impact by extraterrestrial (ET) bolides.
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Pandey, B., Tripathi, A., Tripathi, R.P. et al. KTB iron mineralogy at iridium deficient layers revealed by Mössbauer spectroscopy. Hyperfine Interact 166, 537–542 (2005). https://doi.org/10.1007/s10751-006-9322-5
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DOI: https://doi.org/10.1007/s10751-006-9322-5