Wednesday, December 02, 2015

Drunk on Geology - Black Butte Porter

The next up in our Drunk on Geology series is Black Butte Porter from Deschutes Brewery out of Bend, OR. (Also home to the Obsidian Stout and the Inversion IPA)



Although "butte" is a generic geological term for an isolated mountain jutting out of the landscape (dictionary.com), Black Butte is a specific mountain located within Oregon.

Location of Black Butte, Oregon.



Here is the geology of Black Butte from the Oregon.com webpage:
As you drive toward the flats of Central Oregon toward this symmetrical volcano, you might well wonder why it erupted here. The more famous High Cascades peaks formed along a fault that has been leaking lava for millions of years. But Black Butte grew along a different, parallel crack to the east. This fault also uplifted Green Ridge's scarp to the north, leaving the Metolius Valley as a long trough. 
Black Butte began to erupt quite recently, perhaps only 20,000 years ago. It quickly built up a 3,000-foot pile of cinders, one of the tallest such cones in the state. The eruption also buried the Metoilius River, creating Black Butte Ranch's swampy meadows on one side of the mountain and Metolius Springs on the other, where the river now emerges.
I can not find much information on the volcano, besides what is on Wikipedia.com (and we all know how accurate that can be at times).  However, with that being said, this is what I can glean from them. Black Butte is a shield volcano that is approximately 1.4 million years old (in stark contrast to what the Oregon.com page states). It is an extinct volcano, which I am inclined to agree with, since there is very little information about it and it is not listed on the USGS's list of volcanoes, which lists all of the volcanoes that have erupted in the last 10,000 years.

Besides that, Wikipedia mentions that the primary rock is basaltic andesite. This makes sense since it is "Black" Butte and basaltic andesite is a very darkly colored rock, common to volcanoes.

Basaltic andesite from http://earthphysicsteaching.homestead.com/virtual_geology_museum_galleryc.html

The volcano is also artistically rendered on the bottle and the package.

A nice picture of the actual mountain from http://www.blackbutte.k12.or.us/ 

Some of the descriptive wording presented on the stem.

And the other side of the stem.

Glamour shot

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