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Deep-sea volcanoes don't just produce lava flows, they also explode!
McGill University ^

Posted on 03/28/2011 2:04:55 PM PDT by decimon

McGill geology researchers' discovery of high concentrations of CO2 at mid-ocean ridges confirms explosive nature of certain volcanic eruptions

Between 75 and 80 per cent of all volcanic activity on Earth takes place at deep-sea, mid-ocean ridges. Most of these volcanoes produce effusive lava flows rather than explosive eruptions, both because the levels of magmatic gas (which fuel the explosions and are made up of a variety of components, including, most importantly CO2) tend to be low, and because the volcanoes are under a lot of pressure from the surrounding water.

Over about the last 10 years however, geologists have nevertheless speculated, based on the presence of volcanic ash in certain sites, that explosive eruptions can also occur in deep-sea volcanoes.

But no one has been able to prove it until now.

By using an ion microprobe, Christoph Helo, a PhD student in McGill's Department of Earth and Planetary Sciences, has now discovered very high concentrations of CO2 in droplets of magma trapped within crystals recovered from volcanic ash deposits on Axial Volcano on the Juan de Fuca Ridge, off the coast of Oregon.

These entrapped droplets represent the state of the magma prior to eruption. As a result, Helo and fellow researchers from McGill, the Monterey Bay Aquarium Research Institute, and the Woods Hole Oceanographic Institution, have been able to prove that explosive eruptions can indeed occur in deep-sea volcanoes. Their work also shows that the release of CO2 from the deeper mantle to the Earth's atmosphere, at least in certain parts of mid-ocean ridges, is much higher than had previously been imagined.

Given that mid-ocean ridges constitute the largest volcanic system on Earth, this discovery has important implications for the global carbon cycle which have yet to be explored.

###

For an abstract of the article: http://www.nature.com/ngeo/journal/vaop/ncurrent/full/ngeo1104.html

The complete article is available on request.


TOPICS: Science
KEYWORDS: catastrophism; globalgeologicchange; nature; science; volcanos

Caption: This images shows bands of glowing magma from submarine volcano.

Credit: NOAA/National Science Foundation

Usage Restrictions: None

1 posted on 03/28/2011 2:04:57 PM PDT by decimon
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To: SunkenCiv

Low blow ping.


2 posted on 03/28/2011 2:05:38 PM PDT by decimon
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To: decimon

This business about volcanoes releasing CO2—this is absolute nonsense. The concentration of CO2 in the atmosphere is entirely due to selfish Americans driving SUVs and pickup trucks we don’t really need. And to our absurd insistence upon using electricity, too!


3 posted on 03/28/2011 2:18:52 PM PDT by ottbmare (off-the-track Thoroughbred mare)
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To: decimon
http://www.volcano.si.edu/world/vol_extra.cfm?name=Fiji_Pumice#sean_1302
Wouldn't it be easier to study pumice, floating in the ocean than ash on a island to prove that undersea volcanoes can explode?
4 posted on 03/28/2011 2:29:17 PM PDT by Deaf Smith
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To: decimon; Revolting cat!

The West MUST raise taxes to prevent any further global geologic change!


5 posted on 03/28/2011 2:33:40 PM PDT by a fool in paradise (The biggest waste of brainpower is to want to change something that's not changeable. -Albert Brooks)
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To: decimon

If sub sea volcanoes are releasing CO2, doesn’t that suggest vast deep hydrocarbon deposits?


6 posted on 03/28/2011 3:06:23 PM PDT by DaxtonBrown (HARRY: Money Mob & Influence (See my Expose on Reid on amazon.com written by me!))
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To: DaxtonBrown
If sub sea volcanoes are releasing CO2, doesn’t that suggest vast deep hydrocarbon deposits?

I think all volcanoes release CO2.

7 posted on 03/28/2011 3:13:42 PM PDT by decimon
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To: decimon

[I think all volcanoes release CO2.]

Yes, I was just thinking out loud. I just wonder how much carbon is trapped in the mantle to be transformed?


8 posted on 03/28/2011 3:18:13 PM PDT by DaxtonBrown (HARRY: Money Mob & Influence (See my Expose on Reid on amazon.com written by me!))
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To: 75thOVI; agrace; aimhigh; Alice in Wonderland; AndrewC; aragorn; aristotleman; Avoiding_Sulla; ...

Thanks decimon.
 
Catastrophism
 
· join · view topics · view or post blog · bookmark · post new topic · subscribe ·
 

9 posted on 03/28/2011 4:17:02 PM PDT by SunkenCiv (Thanks Cincinna for this link -- http://www.friendsofitamar.org)
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To: decimon
"Given that mid-ocean ridges constitute the largest volcanic system on Earth, this discovery has important implications for the global carbon cycle which have yet to be explored."

Don't worry, the EPA will fix this. They can simply prohibit US citizens from exhaling for two months after each underwater eruption.

10 posted on 03/28/2011 4:23:17 PM PDT by norwaypinesavage (Galileo: In science, the authority of a thousand is not worth the humble reasoning of one individual)
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To: decimon

It’s been known for quite a while that the increasing amount of atmospheric CO2 is much greater than can be explained by anthropogenic CO2, especially since the increase started before the beginning of the Industrial Revolution.


11 posted on 03/28/2011 4:34:31 PM PDT by aruanan
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To: decimon
By using an ion microprobe, Christoph Helo, a PhD student in McGill's Department of Earth and Planetary Sciences, has now discovered very high concentrations of CO2 in droplets of magma trapped within crystals recovered from volcanic ash deposits on Axial Volcano on the Juan de Fuca Ridge, off the coast of Oregon.

Oh jeez! Now our selfish Western lifestyle is even polluting the undersea magma!
12 posted on 03/28/2011 4:35:39 PM PDT by aruanan
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To: decimon
Woods Hole Oceanographic Institution

Whoo hoo! I spent a whole summer there.
13 posted on 03/28/2011 4:36:43 PM PDT by aruanan
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To: aruanan
It’s been known for quite a while that the increasing amount of atmospheric CO2 is much greater than can be explained by anthropogenic CO2, especially since the increase started before the beginning of the Industrial Revolution.

Something not mentioned here is the oceans acting as a CO2 sink, taking CO2 from the air. If these volcanoes are releasing to the oceans some great amount of CO2 then that must, I would think, much alter their equations. I think that's suggested in this release and probably appears in the study.

14 posted on 03/28/2011 4:43:10 PM PDT by decimon
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To: decimon

And submarines can hit what they produce.

15 posted on 03/28/2011 4:47:19 PM PDT by bmwcyle (It is Satan's fault)
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To: bmwcyle

Hey, it takes great aim to find a mountain in the middle of the Pacific.


16 posted on 03/28/2011 5:03:24 PM PDT by decimon
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To: decimon

Or a last years chart.


17 posted on 03/28/2011 5:05:29 PM PDT by bmwcyle (It is Satan's fault)
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To: decimon; SunkenCiv; All

The Juan de Fuca plate being off the Oregon coast, what danger does a major undersea eruption have for our northwest coast? Either earthquake or poison gas?


18 posted on 03/28/2011 10:56:38 PM PDT by gleeaikin
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To: decimon
Something not mentioned here is the oceans acting as a CO2 sink, taking CO2 from the air. If these volcanoes are releasing to the oceans some great amount of CO2 then that must, I would think, much alter their equations. I think that's suggested in this release and probably appears in the study.

I would think that there would be some type of equilibrium over long periods of time. IIRC, the long term reduction of atmospheric CO2 over geologic time is due to the weathering of rocks.

19 posted on 03/28/2011 11:11:05 PM PDT by Moonman62 (Half of all Americans are above average. Politicians come from the other half.)
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To: gleeaikin

I’m always afraid to use “Juan de Fuca” in a sentence.


20 posted on 03/29/2011 6:57:35 PM PDT by SunkenCiv (Thanks Cincinna for this link -- http://www.friendsofitamar.org)
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