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RE:RE:Pilbara Impact Craters? Re: A paper on origins

[goldencraton]

Witwatersrand style gold targets? Shaw 220km diameter Giant Ring Structure discovered in West East Pilbara Craton Australia.  Oldest Archaean Impact Structure?

Sorry you will have to download the PDF from the bottom of this article to read the whole thing.

https://geotreks.com.au/work/giant-ring-structures/witwatersrand-pilbara-gold-exploration/

goldencraton wrote: Ok the “Pilbara Impact Craters” have names.
Mt. Flora (smaller one to the west) and Shaw (larger and to the east).

Witwatersrand style gold targets? Shaw 220km diameter Giant Ring Structure discovered in West East Pilbara Craton Australia.  Oldest Archaean Impact Structure?

[url=file:///C:/Users/djeff/Downloads/a%20PS%20%231%20Shaw%20GRS%20introduction%20paper.pdf][/url]

From the paper...

Conclusions. The correlation of the median and outer rings of the Shaw Giant Ring Structure (GRS) in the Landsat, geology, gravity, magnetics and radiometrics is independent co-incident evidence of this structure. The concentric nature and the morphology of these rings suggest that the Shaw GRS may be an impact structure.

The age of the Shaw GRS is older than the base of the Fortescue basin and is possibly the cause and therefore the age of the older spherulite beds (3.47 Ga) in the East Pilbara. Purdy’s Reward gold mineralisation lies on the Shaw 200km diameter outer ring, which marks the contact of the basal unit of the Fortescue basin with the underlying East Pilbara Craton greenstones.

 The Shaw GRS, which formed the East Fortescue basin, is the equivalent of the Vredefort impact structure that formed the Witwatersrand basin. This confirms the proposed correlation between Purdy’s Reward and the Witwatersrand style gold occurrence.

There are gold, and other minerals, exploration opportunities where these rings intersect mineralised areas. There is a perfect correlation between the Shaw and Mt Flora rings and the Witwatersrand type Purdy’s Reward and Beaton’s Creek gold projects which strengthens the Witwatersrand model for these deposits.

Marble Bar and Nullagine also have conglomerate hosted gold deposits and lie exactly on the rings. Thus, exploring around these rings for the best deposits is an excellent exploration targeting tool. Preliminary targeting for Witwatersrand gold and iron is presented.
 
Could this be the source of the gold QH was talking about?
gc

goldencraton wrote: If you look at Western Australia from space you could outline one or even two possible impact craters. The larger more south easterly one looks to have happened first, possibly coming in from the north north east. The second smaller crater overlaps a bit of the first and looks like it would have come in from the north leaving a compression bulge around the southern side of the crater.

Notice the concentric lines that form the desert to the east of the smaller crater (you need to zoom in on your Google Earth App). Then the even lines are disrupted at the craters eastern edge. If you study the land around the perimeter of the “impact craters” it does look like some great force re-molded the landscape. Again all just a layman’s perspective. Thanks for spawning the idea Iskyhigh.

Google Earth Pilbara no circles…

https://drive.google.com/open?id=17n5FeySt4WA2mXJZXK6xdkjhXCogcNBU


Google Earth Pilbara with possible impact circles…

https://drive.google.com/open?id=1rQszOQ0QoF5MNqbUa61p2m5G8HlcGaFH


Google Earth Pilbara with possible impact circles and concentric lines outside small circle…

https://drive.google.com/open?id=1x-KbJ8W_ZyPifD3Jjlh70kaLaa3dwRdS

gc