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Author Topic: Where in the world?  (Read 231712 times)

Offline RD

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« Reply #250 on: 12/09/2008 01:50:12 »
This lake is near a National Park and was created by a catastrophic geologic event.





From the dead trees still standing the catastrophic geologic event occurred in the last few decades, (if the photo is present day}.

Guess: Mount St. Helens, Washington State, USA ? (volcanic eruption in 1980).
« Last Edit: 12/09/2008 01:51:43 by RD »
 

Offline Bass

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« Reply #251 on: 12/09/2008 03:11:00 »
picture is mid 90's vintage.  Not Mt St Helens
 

Offline RD

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« Reply #252 on: 12/09/2008 03:57:47 »
Another Guess: Yellowstone national park, Idaho, USA ?.
(No recent eruptions, but forest fires in 1988 could account for dead trees still standing in mid 1990s photo).
 

Offline jysk

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« Reply #253 on: 12/09/2008 06:07:35 »
Looks like a major event, but rather local.

I can see the fresh exposure of a landslide at the top of this valley's draw, and the muck piled on the opposite bank. The dead trees and scoured outer banks are he result of a very serious "rinse cycle".

Mike
 

Offline Bass

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« Reply #254 on: 12/09/2008 06:08:11 »
Much closer, but these trees were not burned- they were drowned.
 

Offline jysk

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« Reply #255 on: 12/09/2008 06:30:57 »
So a landslide looks correct?

The river's flow was dammed by the hillside debris and a new lake formed. The raising water drowned the trees.

Still don't know where it is but I can think of four beautiful examples here in British Columbia.

Mike
 

Offline Bass

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« Reply #256 on: 12/09/2008 20:19:42 »
Correct on the landslide forming the lake.  Not in Canada though.

Where do you live in BC?
 

Offline Bass

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« Reply #257 on: 27/09/2008 00:17:37 »
Earthquake Lake along the Madison River in Montana, just west of Yellowstone Park.  The landslide (and lake) was formed by the August 1959 Hebgen Lake earthquake (M7.3).  The earthquake, which killed 28 people, created fault scarps as high as 30 feet.  Damages included the landslide, submerged homes on the north side of Hebgen Lake (that side of the lake subsided 15-25 feet), and destroyed a US highway along a popular tourist route.
 

Offline jysk

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« Reply #258 on: 29/10/2008 04:08:25 »
Hi Bass,

I see your earlier post. I live on the South Coast of British Columbia. It's beautiful here, but rather soggy. I've been watching your "Epithermal precious-metal prospect" with interest and wonder when we'll get another update.  The end of the field season shouldn't stop the ideas from forming.

Mike
 

Offline beem

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« Reply #259 on: 02/02/2009 03:36:01 »
How about one more?



 

Offline Bass

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« Reply #260 on: 02/02/2009 18:40:13 »
Welcome to the forum Beem

Another obvious landslide.  My guess would be Jackson Hole area, or Canadian Rockies.
 

Offline beem

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« Reply #261 on: 02/02/2009 19:39:18 »
Thanks for the welcome to this superb website!

Second answer, correct.
Site?

 

Offline Bass

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« Reply #262 on: 02/02/2009 22:25:07 »
I seem to remember a large slide in the 60's in SW British Columbia- will search around for the site...
 

Offline beem

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« Reply #263 on: 02/02/2009 22:50:19 »
Bang on, Bass!  ;)
I'll save you some time.

The 1965 Hope Slide, east of Vancouver BC

Copyright M.K.Fleury:
The first earthquake occurred at 3:56am on January 9th 1965. Some scientists believe this was not an earthquake; they say it was a landslide at the top of Johnson Peak.

There was also a small avalanche that blocked the highway in this area. Being winter, the rock was buried in snow so it was assumed to be a snow slide. Nobody knew what was really happening up in the mountain.

Three hours later, at 6:58am, another earthquake occurred. Two minutes later, the entire southeast slope of Johnson Peak gave way and tumbled into the valley below.

Some scientists also say there was not an earthquake and this final landslide was a result of the instability of the rocks unearthed during the first landslide.

Damage Caused by the Hope Slide
Approximately 60 million cubic yards of rock, snow, mud and trees tumbled 6000 feet into the valley below.
Outram Lake, located at the bottom of Johnson Peak was totally obliterated. When the landslide hit the lake, it forced the debris up the slope of the mountain on the opposite side of the valley, then back down to the valley and up Johnson Peak again (a sloshing effect).
Two miles of highway was covered.
The depth of debris in the valley floor was 200 feet.
Four people who were stopped by the snow slide were waiting for the highway crew to clear it out. They were buried by the landslide. Rescue crews only found two of the four people. The other two victims and their cars remain buried in the rock.


 

Offline Chemistry4me

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« Reply #264 on: 07/04/2009 07:10:51 »
Where in the world does this come from?

 

Offline Karen W.

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« Reply #265 on: 07/04/2009 07:17:18 »
Wow That is beautiful!
 

Offline Karen W.

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« Reply #266 on: 07/04/2009 07:24:05 »
Is it Olivine?

maybe Norway or Germany or maybe Egypt?
« Last Edit: 07/04/2009 07:26:16 by Karen W. »
 

Offline Bass

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« Reply #267 on: 08/04/2009 00:27:58 »
Mica.  Most likely muscovite mixed with chlorite.  The distribution of crystals and the fact that they had to grow in some sort of vug (open space) suggest hydrothermal origin.  As to where- your guess???
 

Offline Karen W.

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« Reply #268 on: 08/04/2009 00:41:07 »
Mica really.. I don't think I have ever seen it in raw form before...Thanks Bass..
 

Offline Bass

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« Reply #269 on: 08/04/2009 00:57:16 »
As nice a specimen as that is- my guess would be that it comes from a rock/gem shop.
 

Offline Karen W.

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« Reply #270 on: 08/04/2009 01:38:43 »
It is really pretty like that!
 

Offline Chemistry4me

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« Reply #271 on: 08/04/2009 05:58:27 »
Thanks.
 

Offline Karen W.

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« Reply #272 on: 08/04/2009 06:14:11 »
Your welcome C4M!
 

Offline JimBob

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« Reply #273 on: 08/04/2009 17:58:45 »
Bass, you forgot to say it was in the Muscovite Family but you did get into the ball park.

I agree to the origin - must be hydrothermal and the only place I have seen specimens like this are in museums and for sale. Usually, they come from Brazil or some other place in South America.
 

Offline Bass

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« Reply #274 on: 09/04/2009 16:34:38 »
Bass, you forgot to say it was in the Muscovite Family but you did get into the ball park.

JimBob is absolutely correct- there are a number of mica minerals in the muscovite family- most of which have names with 5+ syllables (which is why I won't list them).

I'll take the appropriate prescription of self-flagellation.
 

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« Reply #274 on: 09/04/2009 16:34:38 »

 

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