Meteorite impact structure? Watchorn – Leonora ring, Landsat, Gravity and TMI correlation.
©Robert Bingley Watchorn 21st August 2017
Meteorite impact structure? Leonora giant-ring-structure interpreted TMI magnetics showing correlation of the rings with disruptions in the geology.
Meteorite impact structure?
A meteorite impact structure has the morphology of Watchorn giant ring structure (GRS). The Watchorn GRS Leonora and Agnew rings crosscut, but do not greatly disrupt the regional geology and there is good correlation between Landsat, radiometric and gravity data rings. This suggests they are involved in a regional, 250 km diameter, geological process and are not just co-incidental non-geological artifacts.
Independent co-incident evidence
The close correlation between the rings of different data types is independent co-incident evidence of their veracity. The concentric nature of the rings, their annular gravity lows and highs and central circular magnetic highs suggest a meteorite-impact structure.
Geochronology
It is suggested that the formation of the Watchorn Giant ring structure predated the last greenstone cycle (2.74 Ga), and the area within the Leonora ring is the centre of the buried impact structure.
Template or palimpsest mechanism
The centre points of the Yilgarn Landsat, Radiometrics, Magnetic and Gravity giant ring structures often do not coincide. There is often an increasing offset with the calculated depth of the original structure. In 1999 Carr and Link published a paper on their studies of the 900 Ma old Beaverhead Impact Structure showing that by the Tertiary (60 Ma) the upper crust had moved the top half of the impact structure 40 km to 54 km east. It is suggested that this template or palimpsest mechanism may have happened in the Yilgarn and would explain multiple giant ring structures where only the centre of one impact site can be located – for example the Yamarna multiple impacts but the only possible impact centre is the Plumridge GRS (Watchorn YY# 1 #2 and YY #3 2017).
Click link below to go to the well illustrated paper —- if you like it share it with your colleagues —- if you use it in research make sure you CITE it.
| YW #4 Leonora correlation of TMI Landsat gravity.pdf | 843 KB |