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Author Topic: What can you tell about these rocks?  (Read 7351 times)

Offline Karen W.

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What can you tell about these rocks?
« on: 22/09/2007 01:25:07 »
Here is a picture... It may not be a great picture but what can be told about it the area in the picture from a geological standpoint?



 

Offline Bass

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What can you tell about these rocks?
« Reply #1 on: 22/09/2007 04:17:05 »
I can tell you that one of them is really shiny! [8]

Looking at the weathering and fracturing, my first guess would be granitic rock, which means the rock was molten at one time and cooled slowly underground- but it's difficult to say from this picture.  Are these from near your home?  Could you get a better focused picture, and also a closeup of one of the rocks?
 

Offline Karen W.

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What can you tell about these rocks?
« Reply #2 on: 22/09/2007 08:25:51 »
It was on My trip to Oergon it was moving in the van while driving and at the time I took the picture I saw nothing shiny.. that is a surprise when I saw the shot! It was taken along the road around Crater lake. You are very close I believe much of the rock there was of volcanic nature at one time or another, Many volcanic looking peaks in the area!
 

Offline Karen W.

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What can you tell about these rocks?
« Reply #3 on: 22/09/2007 08:27:01 »
I will post some more if I have them. I clicked off many while I was not sleeping or sick! It was some interesting terrain!
 

Offline Karen W.

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What can you tell about these rocks?
« Reply #4 on: 22/09/2007 08:32:03 »
This is at the top looking over a protruding rock area at the top of the crater!








 

Offline Karen W.

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What can you tell about these rocks?
« Reply #5 on: 22/09/2007 08:34:31 »
The one from the car window is lower around the roads below the rim!
 

Offline Karen W.

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What can you tell about these rocks?
« Reply #6 on: 22/09/2007 08:41:15 »
More rocky area!





 

Offline Karen W.

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What can you tell about these rocks?
« Reply #7 on: 22/09/2007 08:47:35 »
 A few of the lake just because it is a beautiful site!











 

Offline Bass

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What can you tell about these rocks?
« Reply #8 on: 22/09/2007 16:37:13 »
Crater Lake (Mount Mazama) is a beautiful place, as your pictures illustrate.  Mazama erupted explosively around 7000 years ago (40 to 50 times larger than St. Helens).  After the eruption, the summit collapsed into a caldera, now filled with water.  The rocks in your pictures are probably either welded ash flows (where ash flowing down the side of the mountain is so hot that it welds into solid rock) or rhyolites (the volcanic equivilent of granites).  Mt. Mazama is one of the Cascade stratovolcanoes.
« Last Edit: 22/09/2007 16:40:29 by Bass »
 

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What can you tell about these rocks?
« Reply #9 on: 22/09/2007 18:55:01 »
Hey I only saw it for a couple hours as we stopped on the way instead of comming home which I wanted to do, but I was wondering what causes the water in this place to be so brilliantly blue! I have never ever seen water this blue in my life. I was told it is the natural color. Is it because of the crater or exactly what???? I am really confused as to why so blue. I am sure it is the lights reflecting through the water some how as light does, but why is it so blue here but just over a hop skip and jump to the ocean it is so bluish green, with the caps and foamy parts of the water in the waves looking so white and silvery??
 

Offline Bass

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What can you tell about these rocks?
« Reply #10 on: 23/09/2007 01:05:42 »
From a dimly remembered conversation I had with a park ranger in the 80's--

Apparently the water in the lake is incredibly pure- and pure water tends to absorb the longer wavelengths more than the shorter wavelengths of light- and since blue is the short end of the visible spectrum, the blue is reflected back more versus other colors which get absorbed.  Perhaps one of the passing physicists can explain this better?
 

Offline Karen W.

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What can you tell about these rocks?
« Reply #11 on: 23/09/2007 01:28:13 »
Thank You, That is very interesting. I knew it had to with the light etc.. LOL but I am not good when the light starts turning into shorter and longer wave lengths of light LOL! I have a small basic knowledge and that is debatable by any standards!
 

Offline Karen W.

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What can you tell about these rocks?
« Reply #12 on: 23/09/2007 01:29:35 »
It is one of the most beautiful water areas I have ever seen.. LOL my comparison is only pictures and no real experience except here at the beach or river creeks etc.
 

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What can you tell about these rocks?
« Reply #12 on: 23/09/2007 01:29:35 »

 

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