Learn More About Iceland's Geology: Feeder Dikes and Bomb Sags
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- Опубліковано 15 жов 2024
- Join geology professor Shawn Willsey on Iceland's southwest coast to explore the spectacular geologic evidence of volcanic eruptions. GPS locations: 63.81691, -22.72615 and 63.81526, -22.72334
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I'm so glad you're dipping into the Willsey library to introduce new subscribers to evidence of Iceland's past volcanic history that is now being played out in real time. The past and present together, so to speak. Great work Shawn.
Thank you for the field trip
Thanks for climbing all those dangerous rocks to show us that feeder dike. That is so cool to see so clearly!
Shawn Willsey and His Twisted Ankle Tour....!
Thanks for the "tephra" breakdown. That is some astonishing reach of the ocean to those wave-tossed boulders, too- Nice bomb-sag, shows the gooeyness at the time of deposition-
And the exciting conduit of the feeder dike is very timely, given the recent extrusions-
Thanks for this video! Loved the explaining of what constitute Tuff. Iceland imo, s truly a Geological Island laboratory, so cool
A living planet in action demonstrating land creation!
I'd like to add a side note thank you, Shawn, for your mineral and rock identification videos, which pertain to the feeder dike in particular. I am watching them again. SO valuable!!
Very interesting how those features of soil can tell us the Earth`s history. I love studying geology.
Thanks for all you did recently in Iceland .. now enjoy your time off and have a
Very Happy Holliday Shawn lots of love from Lois Australia❤️
Fantastic example of a feeder dike. Very cool! Would love to see a set of thin sections of samples taken across the several zones that you pointed out. Would be ever so interesting to see the change in the microscopic fabric and mineralogy across that feeder dike and baked margin! I’m betting some researcher has probably done that here or at another similar locale.
For those of us who can’t sleep ❤
0542 Central for me ... wake up between 0530 and 0600 anyway. My cat makes sure 😉
Thank you so much! Have a great holiday season and safe travels!
Lovely work Shawn, thank you for bringing the fascinating volcanic geology of Iceland to my Wiltshire, UK armchair.
Very interesting. Thank you.
Thank you for sharing this.
Very educational and truly fascinating.
Thank you! I enjoyed the detailed lesson .
Thank you for these educational videos. You're an excellent educator! Coffee on the way.
Thanks Shawn 🎉
Fascinating Shawn, really enjoyed this……thank you 👍🏻
Epic, gr8 video. One of my favorites so far because of all the volcano evidence. Very interesting Thank you so much Shawn 👍🏻
Wow! I am behind on these videos. Even though I am old I still find them so interesting!
Thanks for sharing! 😊
I always learn something when i watch you.
Thanks! Watching the feeder dike part of this was like seeing one of your diagrams come to life!
Thanks, Shawn. Interesting and informative.
Wow! ThAnk you. So interesting and cool!
Too bad we didn’t have a visiting geology professor teaching classes when I was stationed at Naval Air Station Keflavik in 1979-80. Things are a lot more interesting when someone can explain what a geological structure / deposit means.
Very informative!
Tom of Geology For Kids checking in! I did graduate from NAU like you did Shawn!
Very Cool. I've been to Iceland twice and I wish I'd known some of this stuff before I went.
I was there this summer and also got to see the eruption on July 12th a few days later... 😊
Thanks!
Thx Prof ✌🏻 Well done, as always. Happy Holidays.
thanks a lot for your daily appreciated information ... great troubles for all islandic people however Christmas is coming so instead of these dramatic events have the most peacefully moments among family and friends sincerely from Paris
💕⭐️⭐️⭐️💕
The Rock Whisperer.
This may stick.
Thank you.
Really excellent. Thank you so much as you explain everything so well.
Thank you, amazing feeder dike, i like the lateral variations of it.
The correction/clarification notes on the video seem to be off by several seconds. Not sure if it's something you would wanna fix. But lovely video, thank you!
Sintering is the word for the tuff transition next to the dike. Particles edges melt together.
I know the word “sintering” from materials science but I haven’t heard geologists use the word.
@@edwardlulofs444 I am a retired Manufacturing / materials engineer not a geologist. My understanding is individual material particles fused together at the contact point with temperature and pressure is a sintering process. I do not know the term a geologist would use to describe this process.
@@oneskydog6768 engineers create for a specific technology. Geologists might say something like the hardness and friability of the rock. It’s usually applied to “tuff”, wielded volcanic ash, which ironically, tuff is usually not tough. Geologists feel free to correct my ignorance, please.
Thank you ❤
Thanks!
Thank you.
My man why are you uploading at 3am? LOL
Maybe because we're all here waiting for the next chapter! 🌋😅
He might have a “script”, that is a small piece of software that performs an operation at a certain time.
Alternatively, if he’s like me, he might like the quiet night time to work. For most of my life as a professor, I routinely arrived at work very early to do class preps, grade tests and answer email.
@@edwardlulofs444 UA-cam allows you to set the "publish" time. But probably he's just a night owl like me.
The other guesses make a lot of sense, but I'll add mine too. Maybe he scheduled it for Icelandic time which would be about 10am as of this post.
Nah. I set this one to publish at that time. Thought might be nice for European viewers. I am not a night owl but more of a morning person.
Great instructive video. One point it left me wondering is why the feeder goes up? I can speculate that it is due to heat or pressure or that the cone was lifted after the feeder was cooled. Guess I'll search for more info. Well done.
Magma rises because it is less dense than surrounding rock. It also contains dissolved gases that expand as it rises.
@@shawnwillsey thanks Shawn. So the feeders are travelling up inside tubes of rock? I guess I was mislead because the feeder was uncovered. I assume the surrounding tube was eroded away.
Maybe it's the camera settings of resolution but the sky is a vivid blue, or perhaps there is much less air pollution. Thanks for the video.
The sky really is that blue in Iceland!
Way cool, thanks.
Carl is also the name of the cow skull in my painting studio.
ARE THE ICELAND SEA STACKS produced by a similar process that created the Boar's Tooth in Wyoming?
We have lots of feeder dikes in Lake Chelan.
I'm particularly interested in this feeder dike. The cross-section of this feeder shows me differences. It looks as though there is a natural separation of sorts with the sheathing (nearer the ash) of it different from the interior. Guessing as a complete outsider looking in, I'd guess that the outer sheath was moving slower, perhaps was more viscous, and that the interior part was more fluid but then also composed perhaps of a less dense mixture? It makes me wonder about the chamber below and how the materials self-separate out before breaking through and rising upwards through such a dike. I'd love to see a model that would explain every quantitative detail of this dike.
Nice, though, that you addressed some of my questions on this. By the way, this is perhaps the most interesting video on the recent topic of magma dikes and Iceland that I've seen so far. Liked it very much! It makes me wish to understand the chemistry and physical mechanisms better. And I think that is the kind of thing that might cause someone to want to pursue geology. Good work!
So would Hvítserkur have been formed in a similar way?
SO WOULD YOU CONSIDER THE MATERIAL IN THE FEEDER DIKE INTRUSIVE OR EXTRUSIVE ? Due to the larger crystals in the center of the dike
Sometimes we use the term "hypabyssal" for very shallow intrusive events.
Thank you for your answer Shawn
I went there last month that is Black Sea right? Mr Willsey
Do you find Peridot in that basalt?
?????? Tuff cone... Could the ash have a distinct structure to it that shows evidence of the water interaction?
Is the plume Tuzo or Jason?
👍
A _what?_ lol
Excellent!! Would love to see the range of that dike in even more detail. Thanks.
Thanks!
Thanks!
Much appreciated
Thanks!
Excellent video, as always, Shawn. It is very helpful to have you and other geologists on the ground during active hotspot-related eruptions to record observations that go a long way to explain what we see from the past. Thank you for what you are doing.
Just a minor comment for clarification: Iceland isn't an anomaly in the geologic record. Mantle plumes have frequently interacted with divergent plate boundaries. Well-known modern exceptions include Hawaii and the current configuration of Yellowstone, although the latter likely originated near a divergent oceanic plate boundary (or triple junction) in the northeast Pacific basin at least at 56 Ma before accreting to and overridden by the North American plate.
Much appreciated. Glad you enjoyed this.