Geophysics

   

The 40x33 km Elliptical Pilbara Crater Near Port Hedland (NW-Australia)_raman Spectra of Selected Rock Samples

Authors: Harry K. Hahn

Raman spectra of quartz samples collected at the sample sites 25, 11 and 10 provide first evidence for this 40 x 33 km elliptical Impact Crater and for the secondary impact-structures produced by this crater The impact crater is located near Port Hedland in Western Australia. Because of the ellipical shape of the crater it is the result of an oblique impact. That means the impactor which formed the crater impacted in a very shallow angle of probably less then 10°. Because of the shallow impact angle, fragments of the impactor were ejected from the crater and caused complex secondary impact structures 40 km and 80 km further east of this elliptical crater. One of the secondary impact structures is Mount Goldsworthy which contained the world’s richest deposits of ferrous (iron)-ore with a share of up to 68 % iron. Beside the Raman spectra which I present as evidence and first verification for this elliptical crater and its secondary impact structures, there is additional geo-physical evidence provided from a magnetic anomaly map, which clearly indicates the elliptical crater, including a center-line structure in the crater, and which shows the secondary impact structures in detail. The shifts of the main Raman peaks to the lower frequencies 463, 261, 198/205 and 125 cm-1 in a quartz sample from the sample site 25 ( Stone 2 ), which was collected inside the crater area, clearly indicates that the quartz was exposed to a shock pressure of around 22 GPa. ( see explanation at page 19 ). Further evidence for an impact event is provided by quartz samples from sample sites 10 & 11 which are located in the area of the secondary impact-structure Mt Goldsworthy. These quartz samples show shifts of the main Raman bands ( peaks ) to the lower frequencies 463, 260, 204 and 126 cm-1 which also indicates a shock pressure of around 22 GPa. Further evidence comes from a microscopic image of sample 25 (stone 3) which indicates planar deformtion features (PDFs). All spectra were made with a BRUKER Senterra-II Raman Microscope (wavenumber precision <0.1cm-1) Images of the analysed rock samples and photos of the sample sites are in the Appendix at page 17. Images of all sample sites are available on www.permiantriassic.de or www.permiantriassic.at

Comments: 20 pages, 33 images, 28 diagrams

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Submission history

[v1] 2021-07-28 23:46:28
[v2] 2021-08-11 14:27:39

Unique-IP document downloads: 513 times

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