Authors: Harry K. Hahn
With this part of my study I want to present mineralogical evidence for my Permian-Triassic Impact-Hypothesis. I do this with the help of selected rock samples where I have found indication for shock-metamorphic effects in the samples. I used Micro-Raman Spectroscopy on quartz-grains in the samples, to provide first evidence for a shock event, that was caused by an Impact. In this study I present spectra of samples from six possible secondary impact craters of the Permian-Triassic Impact-Event (PTI) in Europe & Australia where a clear shift of the main Raman-peaks of the analysed quartz-grains is visible towards lower frequencies. This shift of the Raman peaks indicates that the Quartz was shocked with a shock-pressure in the range of 20–22 GPa. One sample from the possible Ø130x110 km „Bay of Lyon“ Crater even indicated a shock pressure of ≈24 GPa. New pages added to this Update present evidence for secondary-impact-structures in Western-Australia probably caused by the Ejecta-Ray-R4 of the PTI and caused by other ejecta-rays originating either from the BBC (PHC) or from the VLC. I also added links to studies which present indications for secondary impact structures on the Canary Islands and on the island Mallorca (Spain), caused by impacting ejecta from Ejecta-Ray-R1 of the PTI. First I give a short description of each possible Secondary Impact Crater of the PTI with the help of geophysical information (topography, gravity- & magnetic-anomaly maps). Then I show the spectra of the quartz-grains which provide evidence for an impact-shock-event. All spectra were made with a BRUKER Senterra-II Raman-Microscope with a wavenumber-precision <0.1 cm-1. The measured shifts of the quartz-peaks in the range of 1–4 cm-1 are precise and real. A diagram in the Appendix (see last pages) shows how the shift of the quartz-peaks depends on the shock -pressure the quartz-grain was exposed to, during the impact event. ( my thanks to Dr. Jürgen Sawatzki who supported my analysis). At last I want to ask the scientists who read my study, to help to proof the Permian-Triassic-Crater in the Arctic-Sea. The best way to proof it would be an analysis of drill-core-samples from the rim of the PTI-Crater. But first a proper analysis of samples from the described PT-Secondary Craters, for PDFs (planar-deformation-features) should be done. Please also read the Abstract and pages 4-6 of my Summary of the Geophysical Evidence.
Comments: 40 pages, 176 figures, 68 diagrams ; added page 13, updated pages 35-37
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