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 Post subject: Re: Geology Quiz (RV)
Unread postPosted: Mon Mar 30, 2009 4:41 pm 
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Location: Helderkruin
Granite?


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 Post subject: Re: Geology Quiz (RV)
Unread postPosted: Tue Mar 31, 2009 6:44 am 
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Location: GAUTENG , S.A.
Close , and also a colour .


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 Post subject: Re: Geology Quiz (RV)
Unread postPosted: Wed Apr 01, 2009 3:05 pm 
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Location: GAUTENG , S.A.
Granite is close , so here is a clue to get this quiz to bed.

The rock type at Augrabies is the metamorphic equivalent of the igneous granite .

Reference : The National Parks of SA (Struik) text by Rene Gordon , photo's Anthony Bannister , consultant on Augrabies Andrew Gubb .


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 Post subject: Re: Geology Quiz (RV)
Unread postPosted: Wed Apr 01, 2009 3:15 pm 
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Moon rock popups? :hmz:

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 Post subject: Re: Geology Quiz (RV)
Unread postPosted: Fri Apr 03, 2009 6:31 pm 
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A medium grained granitic rock with a gneissic texture, IOW, granite that was altered by heat. The main minerals are large pinkish feldspar crystals, glassy quartz and black mica. Is this more what you had in mind?


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 Post subject: Re: Geology Quiz (RV)
Unread postPosted: Mon Apr 06, 2009 7:16 am 
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Location: GAUTENG , S.A.
Yes , pink gneiss .

You are it .


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 Post subject: Re: Geology Quiz (RV)
Unread postPosted: Tue Apr 07, 2009 1:03 am 
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KEPs :clap: :clap: :clap:

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 Post subject: Re: Geology Quiz (RV)
Unread postPosted: Wed Apr 08, 2009 6:59 pm 
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Have you ever seen on the map that there is greenstone in the area, and not a green rock is to be seen?
What is greenstone, why was it named as such, and what is special about it?


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 Post subject: Re: Geology Quiz (RV)
Unread postPosted: Thu Apr 09, 2009 2:56 am 
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Darn, I wish I knew more about geology! I saw some specimens of greenstone in the botanical gardens in Jo'burg, and I seem to remember that one of them had a green tinge, but the others didn't.

I seem to remember that greenstone was so named because of the green tinge the rock (supposedly) caused by, I think, some metal chloride. I know they are associated with granite outcrops and I've read that there is one belt somewhere in the Barbeton area of SA, close to Kruger.

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 Post subject: Re: Geology Quiz (RV)
Unread postPosted: Thu Apr 09, 2009 5:42 am 
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Hi OWN
Greenstone Belts occur as belts of deformed volcanic and sedimentary strata and get their name from the presence of green minerals (Actinolite,amphiboles,Chromium muscovite “fuchsite”, epidote, green chlorite and serpentine).
These ancient rocks are among the oldest in the World. The Barberton Greenstone belt is one of the oldest and best exposed Archaean greenstone belts on Earth and is almost 3.5 billion years old.

Source: Louis-John Havemann

I know nothing about geology but this is fascinating stuff! :D

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 Post subject: Re: Geology Quiz (RV)
Unread postPosted: Thu Apr 09, 2009 5:48 am 
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Taa, Skillie; that puts it in more perspective for me! :thumbs_up:

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 Post subject: Re: Geology Quiz (RV)
Unread postPosted: Thu Apr 09, 2009 8:51 pm 
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Location: Helderkruin
OWN: Very good general direction.
Skilly: Excellent, just what the doctor ordered. :clap: :clap:

A must have if you're interested in geology is "Geological Journeys" by Nick Norman and Gavin Whitfield.

Please note that this book carries a health warning:
If you do not have a tame geologist on board, budget for a few extra hours for your trip.
If you do have the tame geologist.... add a few more :twisted:

Skillie, next one please!


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 Post subject: Re: Geology Quiz (RV)
Unread postPosted: Thu Apr 09, 2009 9:07 pm 
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:funny: :thumbs_up:

sKILLIE :clap: :clap:

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 Post subject: Re: Geology Quiz (RV)
Unread postPosted: Thu Apr 09, 2009 9:09 pm 
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KEPs wrote:
If you do have the tame geologist.... add a few more :twisted:


A tame geologist? A TAME GEOLOGIST!

KEPs I am sorry to dissapoint you but if you think you have a tame geologist, it is actually the other way around. You are the one who are well trained to stop at the right outcrops :twisted:


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 Post subject: Re: Geology Quiz (RV)
Unread postPosted: Thu Apr 09, 2009 9:13 pm 
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:lol: :lol:

By the way. KEPs, you asked why greenstone doesn't sometimes appear as green: why is this please?

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