Authors: Harry K. Hahn
The Gravity Anomaly Map indicates that Ejecta-material from the Ø400x350km Port Hedland Crater or from the Victoria-Lake Crater (VLC) in East-Africa probably impacted in the Kalgoorlie-area and formed the noticable linear structures. The Port Hedland Crater and the Victoria Lake Crater (VLC), which are both unknown craters yet, in all probability are large secondary-craters that were caused by the Permian-Triassic Impact Event (PTI). The geological map shows large-scale structures (linear- & bow-shaped structures) in the Kalgoorlie-area which have strong similarities to structures caused by ejecta-blankets (-lobes) originating from an Impact-Crater. These structures consist of rock-types different to the rock-types of the surrounding plains of the Yilgarn Craton. Compare these structures to the ejecta-rays (-lobes) from the Graterri-Crater on Mars ! These ejecta-ray-structures penetrate the Yilgarn-Craton approximately down to a depth of 10 km ! In the Kalgoorlie area the Super-Pit gold-mine is located. The Gold and other rare- & heavy-elements found in the area surely were ingredients of the PT-Impactor (an asteroid or comet), the origin of the ejecta that impacted here. I have collected some rock-samples from these ejecta-ray- (lobe-) structures in the Kalgoorlie area and have analysed these samples, mostly quartz, with Micro-Raman-Spectroscopy, to find out if they were exposed to a shock-pressure which may indicate an Impact Event. And indeed that precisely is the case ! The Raman-spectra of quartz from the Sample Sites 2, 4, 5, 13, 21, 27 & 31 provide first evidence for an Impact Event as the probable cause of these Ejecat-ray- (lobe-) structures in the Kalgoorlie Area. So far the samples from the Klagoorlie-area provided the best evidence for an Ejecta-Impact area !! The following shifts of the main Raman-peaks, of the analysed quartz grains, to lower frequencies (which all indicate an impact shock event) were measured : 462, 261, 204 & 125 cm-1 (Site 2_stone_1); 463, 260 & 205 (Site 2_stone 2); 463,260,204 (Site-4); 463,260/266 (Site 5); 463,261,125 (Site-21); 463,261,205,125 (Site-27); 463,257/267,204,125 (Site-31); 260,126 (Site-5_stone_2) & 204, 126 cm-1 (Site-13). Microscopic images of a number of analysed quartz grains will provide further proof for a shock event ! PDFs (planar deformation features) seem to be present in some samples ! (see images on pages 4 to 17). All spectra were made with a BRUKER Senterra-II Raman-Microscope. Images of the analysed rock samples and photos of the sample sites are in the Appendix at page 18.
Comments: 29 pages, 75 images, 34 diagrams
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[v1] 2022-01-19 16:21:13
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