Liquid hot magma
For some reason I automatically read that with a Dr Evil voice.
Liquid hot magma from the Earth's mantle can shoot up to the surface via a "highway from hell" over just a few weeks, volcanologists have discovered. Boffins studying the Irazú stratovolcano in Costa Rica, and specifically its eruption between 1963 and 1965, found the first hard evidence of high-speed magma ascents. This proves …
For some reason I automatically read that with a Dr Evil voice.
Had not read this elsewhere; very interesting.
When I see or hear a phrase like "liquid hot magma" I am reminded of broadcast banter between Pete van Wieren and Skip Cary during an Atlanta Braves baseball game. Pete described an athlete as having "a real physical body." The ever-acerbic Skip snarled, "As opposed to what?"
Whenever I see that, I chuckle.
Magma is by nature hot. It's under immense pressure. Release pressure, that which might only be plastic ends up mixed gas and liquid matter.
I'll not go into local mixing due to oceanic pressure on the mass' movement upwards and the contribution of water to eruptions.
The Earth has already upgraded to USB 3.1 ? Cool !
"" ITS FIREWIRE""
It's long been deduced that magma from very deep in the earth must occasionally come to the surface very quickly. Diamond is a stable form of Carbon only at very high pressure (>50km deep, ISTR). If magma containing diamond rises slowly, the heat and reducing pressure will decompose the diamond into graphite. It has to rise fast and cool fast, to freeze the Carbon as metastable diamond.
Diamond is associated with the igneous rock Kimberlite, and no Kimberlite erruption has taken place in recent geological history. This is possibly a good thing. They may be extremely violent events and/or happen unexpectedly at a location with no extant volcano.
Yes, but on the upside, as we all roast and choke it would be raining DIAMONDS!
Actually, there's a lot of work on low pressure diamond formation. Yes it has been assumed it has to be high pressure, high temperature for natural diamonds. I'm not sure that's not going to be revised in the future.
That's hardly an up side. Raindrops Keep Falling On My Head would become a song about being tortured, and the remake of Singing in the Rain would have to be a snuff movie.
Also most of it wouldn't be gem quality.
> happen unexpectedly at a location with no extant volcano.
IE big ass meteor strike? I swear the Cullinan Diamond had to be of extraterrestrial origin or formed by a meteor strike. You don't get a one off 3000 carat diamond through natural earth processes.
“The study provides one more piece of evidence that it’s possible to get magma from the mantle to the surface in very short order,”
So when can scientists arrange for this to be delivered to my barbeque at say 7 o'clock each evening, on sunny evenings only of course, ready for me to put on the dinner?
A study (that I have only heard of, not read yet) suggest that Grímsvötn volcano eruption 2011 was due the same phenomenon. A new influx of magma at depth started the largest eruption in that volcano for 140 years and creating a ash cloud that did go up to 20 km in the air.
If that is going to happen again in Iceland I do not know, but I am keeping a eye on it as is.
I think this is the paper you want:
Maﬁc intrusions triggering eruptions in Iceland by O. Sigmarsson
Similar triggers have been proposed for the Soufriere Hills eruption on Montserrat which seems to have had a relatively cool, mostly crystalline magma chamber that then received an injection of very hot mafic material. That created local melting, parts of the crystal slush in the chamber largely melted, became mobile and began to move up towards the surface.
Injections of magma are well-known to trigger eruptions - new material can simply overpressurise the magma chamber, the heat can cause a greater degree of melting and more mobile magma, it can cause gases to exsolve from the magma, or it can introduce new gases into the chamber.
The paper says it takes months to years for the magma to reach the magma chamber with some indication that faster ascent occurred later in the eruption. Still fast, but not quite as dramatic.
The geochemistry is quite unusual. Had the magma hung around in the crust it should have relatively low olivine (it fractionates out very early) and any residual olivine would have been iron-rich (low forsterite) since magnesium olivine crystallises at a higher temperature. Low olivine usually means low nickel (Ni is incorporated into olivine crystals), but this eruption had very high concentrations magnesium-rich olivine and lots and lots of nickel. So it must have come straight up from the Mantle.
Fast-moving, deep-seated magma is found in places like the African rift where you get weird eruptions of low-silica, nickel-rich magmas such as sodic carbonatites (practically molten washing soda) and nephelinites; but in many cases the very hot magma rising from the Mantle begins to digest the crust around the fissure or vent and you end up with highly contaminated magmas that are chemically quite different from their original primitive magmas.
Good paper all round!
Spoken with the voice of Sir Bedivere:
How come you know so much about volcanism?
Logically, the answer clearly must be he is a Vulcan.
WTF did you sign yourself off as AC? That's just twisted.
The SWAT team is under way. We have complete records.
My question: where can I buy tickets?
No need for tickets, you are Marshmallow.
What time? 6.29AM EST or 7.29AM EDT? We're on daylight savings time don't you know.
Actually it will be okay. Pete and Myka retrieved the stick thingie and it is back at Warehouse 13.
That and the eye/tongue disruption for all non-Icelandic speaking people trying to read or say that name...
The word crust is really idyllic. Magma translates up through dikes and sills which are cracks and voids in the country rock. Remember Crack in the World and Journey to the Center of the Earth? Since these natural magma rivers are already present all the magma has to do is follow the path of least resistance. The more interesting question would be why is not their more active volcanos? Maybe that's because the Earth is done with mega-eruptions like kimberlites and has settled into tectonic contraction. Whats an undersea volcano called anyway? Marecano?
Volcanoes are named after Vulcan (Volcano in Italian), the God of Fire. It surely also comes from the name of some place in Italy.