Evidence of Impact at the Permian/Triassic Boundary from Mössbauer Spectroscopy |
| |
| Authors: | Verma H. C. Upadhyay C. Tripathi R. P. Shukla A. D. Bhandari N. |
| |
| Affiliation: | (1) Department of Physics, Indian Institute of Technology, Kanpur, 208016, India;(2) Department of Physics, Jai Narain Vyas University, Jodhpur, 342001, India;(3) Physical Research Laboratory, Navrangpura, Ahmedabad, 380009, India |
| |
| Abstract: | Sediment samples from Spiti valley, India, deposited about 250 Million years ago during the Permian-Triassic transition, have been analysed. 57Fe Mössbauer spectroscopic studies show that iron occurs mainly as nanoparticles of hematite and goethite with a broad size distribution. The results show a high degree of resemblance with the Cretaceous-Tertiary boundary (65 My) samples where an asteroidal impact is believed to have caused mass extinction. |
| |
| Keywords: | |
| 本文献已被 SpringerLink 等数据库收录！ |
|
