KTB iron mineralogy at iridium deficient layers revealed by Mössbauer spectroscopy |
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| Authors: | Brajesh Pandey Amita Tripathi R P Tripathi H C Verma |
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| Institution: | (1) Department of Physics, IIT Kanpur, Kanpur, 208 016, India;(2) Department of Physics, JNV University, Jodhpur, 342005, India |
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| 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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| Keywords: | M?ssbauer spectroscopy KT boundary nanophase iron iron mineralogy |
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