Skip to comments.Geology Picture of the Week, May 21-27, 2006: Lava Falls and Lava Falls
Posted on 05/24/2006 12:05:49 PM PDT by cogitator
I was looking for some pictures of the dome collapse on Montserrat that happened on the 22nd, but there isn't much, apparently. What with Merapi and Montserrat, I've been doing too much with pyroclastic flows. For some reason, I remembered a picture of the Mauna Ulu eruption (the one before the 20-year long and still going Pu'u O'o eruption), of a big lava flow that looked like a waterfall. Below is a small version; click it and go to the page where you can download a TIFF version (if you have Quicktime installed, it will load for display in your browser):
So that is Lava Falls number one. The second is the famous Lava Falls rapid in the Grand Canyon (because I don't want my geology pictures to be all about volcanoes). It's hard to find a picture of Lava Falls that shows the geological setting -- most of the pictures just show roiling water. Here's the long view, where Lava Falls is a little white riffle. Vulcan's Throne, featured below, is out of picture to the right:
And a typical close-up:
Of course, the reason that it's called Lava Falls is that it's under a volcano perched on the edge of the canyon, Vulcan's Throne, which clearly at one time created a lave cascade like Mauna Ulu, only considerably bigger:
These images are from this page, Uinkaret Volcanic Field, Western Grand Canyon, Arizona
and they aren't the highest quality. The best picture of Vulcan's Throne I could find on the Web is linked below; it's too big to post here.
Years ago, National Geographic had a great picture of Vulcan's Throne. This one is similar:
** ping **
Great photos. love to lok at volcanoes all of the time. Seen 2 eruptions in my life and both were unbelievable to watch.
I lava those pictures...
We have some gret pictures of the skylights in Hawaii. Really cool, or would that be hot?
The one active eruption I saw was Pu'u O'o from the air, during the Kupaianaha lava pond phase. So I saw an active lava pond, a skylight, and an ocean entry on one helicopter flight. Not bad for a first-and-only (so far).
Thanks for the ping
Aren't you concerned about endangering the faith of YECs about the origins and age of the Grand Canyon?
The idea of a volcano intruding into recent "great flood deposits", still pretty wet, would produce a whole lot of steam and interesting local effects on the sediments. Is there any evidence of this?
More to the point the volcano is younger than the canyon. The lave flow is down the side of the canyon. Does it go all the way to the water?
Nope! (Plus, I bet there's some way to date those lava flows.)
"In the last 2 million years, more than 150 lava flows have poured into the Grand canyon. These flows formed 13 major lava dams that ranged in height from 200 feet (60 m) to 2,000 feet (600 m) in height. The largest dam impounded a lake that was more than 2,000 feet (600 m) deep and had a shoreline near the base of the Redwall Limestone. Two lakes were so large that they extended into Utah and beyond the present shoreline of Lake Powell. Most of the lava dams are less than 1.2 million years old."
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