TODAY, words from this article capture my interest, as I incrementally investigate as a layperson:
“Magma Reservoirs, Chambers and Mushes”: How do we know they exist?The vigor and size of volcanic eruptions depend on what happens in magma reservoirs in the Earth’s crust. When magmatic activity occurs within continental areas, large reservoirs of viscous, gas-rich magma can be generated and cataclysmically discharged into the atmosphere during explosive supereruptions. As currently understood, large pools of explosive magma are produced by extracting interstitial liquid from long-lived “crystal mushes” (magmatic sponges containing >50 vol% of crystals) and collectingit in unstable liquid-dominated lenses.
Back to the bucket that started my interest:
Hi Joan – I’m out with ROV Jason and Sentry AUV here 2 days north of New Zealand at Havre Volcano, a submarine volcano that erupted in 2012. We have been doing some gravity coring and there was some extra mud that I’ve stashed away for you. The Jason system will be back at WHOI in late June and I’ll bring it over to you.
If you want info on where we are and about Havre Volcano you can find it at this website.
Hope all is well with you.
The position of the mud sample is:
1830 m depth
Joan says, on June 3, 2015, the day she opened the bucket curious to see what Dan described as 70% silica, wow! Amazing the changing material and fit of plastic lids and buckets these days — first task was getting in. Dan also said there’d be lots of sea water which I reverently decanted while romanticizing how close I now am to a once-ferocious volcano. Next I dug in, nodding that this is pumicy, granular, wishing I had a microscope. Like Mt. St. Helen’s ash?
In a few weeks I’ll have a test fired but for now, my hunches are to pour it over porcelain and use the blackest writing — guessing, a yellowish green glaze outcome and wondering how a reducing atmosphere might color it (can I get some carbon trap?)
June 28th, 2015: Pumice Sample thanks to Adam Soule
Adam is curious about whether pure pumice ground into varied particle sizes will look similar to the pumicy mud Fired Havre Pumice/Mud recently. I’ll test it soon.
There are some for sale and hopefully there’ll be more in future firings. I never take much for granted about the buildings where I work — a hurricane or a sale of property could take them from me.
Well Adam, here’s the question and the answer: