‘Nick From Home’ Livestream #42 - Igneous Rocks
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- Опубліковано 24 лип 2024
- CWU's Nick Zentner from his home in Ellensburg, Washington on Wednesday, May 13, 2020 during the global coronavirus pandemic. Igneous rock classification, texture, cooling history, mafic, intermediate, felsic, etc.
I'm a little late to the game here, But one question asked, I believe by Gavin...Made me think of Kilauea's 2018 eruption.
Most of the lava in the beginning of the eruption was found to have erupted through magma left behind from an eruption in the 1950's.
Out of the 24 fissures that emerged though, one in particular stood out to everyone: Fissure 17!
Apparently it had erupted through magma MUCH older. Possibly hundreds of years old, and they actually found chemical traces for andesite.
I'm not sure if that actually answered the question, but Fissure 17 was what immediately came to mind.
ua-cam.com/video/ZYOXbqfZ9vc/v-deo.html&ab_channel=LiveStormsMedia
I believe Fissures 16 through 20 are in this video. You can really see (and hear) the differences.
Fissure 17 is the one that goes BOOM! :P
Yes that is correct. This USGS presentation discusses the eruption and fissure 17 from 11.30 minutes into the video: ua-cam.com/video/85WXeY4U56g/v-deo.html
Nick, All the technology of the internet is just cats and porn without characters like you.
I have to thank you for your live streams, Some of the best work I've seen in internet education.
Hear, hear!
You go on about how boring this is, but honestly, this is the first time I've seen someone lay out the grammar of igneous rocks. And I grew up going to Yosemite every summer! I read these Roadside Geology books and they spew out all these words, but it's like reading Hebrew - backwards and in a different script! I teach finance and regularly I have to explain to new students the basic difference between dividends and capital gains vs interest. It seems so obvious to me, but students come in and they've heard the words. They bought a car & taken out a loan. But they never thought about what the words, dividend and interest mean in terms of risk, reward, cashflow timing, taxes, obligations and ownership. So similarly this is the grammar of geology and knowing the grammar is basic to understanding what it all means.
Thank you for going through this! As I said, for all my reading, I've never seen it laid out so clearly.
watching some over and over. This vid is one of your best
Thank you for the basics. All new to me! Will be watching these again. 👍🌸🧡
Nick, stop worrying about a little shade. We can still see everything just fine. Thanks for being so awesome.
Missed live watching after the fact! This is great.
Thanks Nick, love what you are doing!
The obsidian with red or orange in it is called Mahogany Obsidian.
Missed it live. Dagnabit! Got stuck working on motorcycles in a buddies garage. It went on longer than expected. Beer was involved. Loved seeing all the gifts (spiced almonds are the bomb!). I need to get back to watching this, and expanding my brain beyond muffler stuff. Having a COOKIE QUAKE IN MY BELLY will likely help with being randomly deranged. Great show as always. Cheers!
Kid Katabatic we missed you!
@@KathyWilliamsDevries Thanks Kathy! I'll be there from here on on in, barring random unforeseen global events like having to return to work. That's gonna be a major dagnabit moment. Don't want think about it, but it's looming.
Learned loads. Thank you for all that. Cheers from Jane in the UK.
Professor Zentner. you are a very honest person especially when you admit that you don't know or have an answer to a question; you've got to love it. It's Crystobalite that forms the "snowflakes" in Obsidian. Thank you.
I tickled me to watch Nick drinking from a glass of water containing pumice and tephra. The obvious line is 'water on the rocks'.
Always an entertaining teacher, thanks from Australia.🍺🤓🇦🇺
You are like if Bill Nye wasn't an asshole and if Mr Rogers was a scientific expert. I really appreciate how gentle you are with your audience and that you tell us you love us. We love you too!
I love you, Hollis, for this hilarious comment.
On workdays. It is hard to watch in the middle of the night, so watching later, sorry Nick, from the Netherlands
You make rocks entertaining. Thanks for the knowledge
This video was in my UA-cam recommended page...
I think igneous rocks too!
Missed the live version this evening, but catching up! Thanks Nick!
Pretty soon the whole neighborhood is going to show up! :D I would!
Riveting. Australia. Rock on!
Awesome video and entertaining. Thank you
Ohhhhh. Aha! Thanks Prof Nick. You are swell. All I know about monzonite, is that it's a nifty sounding word especially the Monza part, and that it is used in every sentence describing Yosemite's Half Dome formation in my 1974 copy of N. CAL by Harbaugh.
I'm glad that I can watch this one again. I'm thinking about too many other things that I have to do than sit and watch this. . Popcorn brain today.
Nick on the Sauce, lol ✌
Good stuff 👍
from that fisheye you gave us in closing, I don't that toast was water, Nick...😜
Gavin had a question about phenocrysts forming in the pluton to show in porphyritic rocks. I was wondering if there is a connection to a older magma being pushed out by a lower hotter magma. There is a great USGS video describing the eruption sequence in the 2018 Hawaii east rift zone, where they speak of the initial flow as slow and then that thicker lava is pushed out and a fast moving lava then flows like water.
Wahoo!!! One of my favorite topics ever!
Late to the party by a couple of years, but I’m learning so much!
I watch this for the third time
WHY DOES BASALT ROCK GROW PLANTS SO WELL?
The "snowflakes" in Snowflake Obsidian is a mineral called cristobalite. Cristobalite has the same chemical formula as quartz (SiO2) but has a different crystalline structure. I bet the answer came to you the minute the video was over.
There are some large heavy boulders that are either basalt of gabbro as I was not sure . still am not. had another look today after watching the video this morning.
they were being worked on by some sculptors . There are large rusty looking faces , which must be the iron now that Ive seen this video. But the boulders also have some foliating whitish bands , so this must be a metamorphic at least in part, if that's possible.
Like this a lot.
I think obsidian doesn't have cleavage planes cuz it cools super fast upon eruption, forming a glass. Hence the conchoidal fractures.
Hard as an old cookie ? :) I love your examples.
Where in Washington can you find the coarstest structured rock from magma chamber?
Nice explanation
Love the giant cookies.
The Texas Capitol is made of pink granite quarried in Marble Falls, TX, a town my great, great grandfather founded. The town is a misnomer since all the rock is granite.
What about Catalina Island? 26 miles across the sea. .
Hi Nick. I realize I'm way behind you and understand if you don't answer this. I don't understand how, as molten material cools, how do minerals decide what they what to be. Is it related to % silica? Please forgive my simple mind. Thank you!
yup, depending on silica content the molten lava will cool into quartz/feldspar (lots of silica), periodate/olivine/micas (low silica), or hornblende/? (medium silica) :)
One of The Rock's you held up before you were defining appeared to be amygdaloidal, was it rhyolite or basalt?
Nick Zenter are you now World Famous?
I need the rules AND see rocks rules please, from Northwestern Nevada
Basalt on the left? There will be pushback.
best teacher I get it!
No subtitle Michael O’Brien?
Sometimes less on my part (or nothing) is more. Nick was focused tonight; I'm just a freshman in the back row cramming for the midterm.
when you teach you learn twice
Less hardcore Europeans watch a bit later 😁 regards from NL
Bowens Reaction Series. Old People Are Best.
1:12 of course you go left to right. Its west coast geology. Ocean, Coast, Continent
Ofcourse! That's a tell as to where the geologists are from.
WHAT ARE CONGLOMERATE ROCKS COMPOSED OF?
Other rocks
I'm sure Liz was annoyed that you took a bite out of every cookie in the box and left none for her!😢😢
the minerals are randomly arranged....
Lowest silica magmas on this planet are NOT 45%. Lowest silica magmas come from places like Nyiragongo and can go as low as 36% silica. Then of course we have carbonatite magmas which have 0% silica content because they're based on a fundamentally different chemistry.
It's a beautiful day in ellensburg 😂😂😂🎶🎶🎙🎶🎙 tired of Mr Rodgers lololol 😅😅😅
Minerals rock...lol
Watching from New Braunfels, Texas - mgould100 on youtube
IF MAGMA COMES UP FROM THE MANTLE, WHY DOESN'T ALL MAGMA THE SAME AMOUNT OF SILICA?
My guess is it has something to do with the composition of the material it melts through on the way to the surface
Another guess is the HUGE magma chamber(s) within the earth is not homogeneous.
Fractional crystalisation. Assimilation of surrounding rocks into the melt. Mixing of different magma bodies.
My Gene (not your "Gene" the cookie person. .. although iwe live very close to Puyallup) came up with Swiss cheese analogy a second faster than you! Porphyritic textured ingenious rock.
Ow, my brain hurts! It reminds me of a story:
Sherlock Holmes and Dr. Watson went on a camping trip.
They decided to set up their camp site and go to sleep early.
In the early morning hours Sherlock Holmes nudged Dr. Watson awake,
"....Watson, take a look at the stars and tell me what you deduce..."
Dr. Watson took awhile to explain the stars were actually suns with, possibly, several planets orbiting them.
"....Therefore, with so many other 'solar systems' out there - we cannot be alone in the Universe."
Sherlock replied, "Watson you idiot! -- _Someone stole our tent!!..."_ :smileywink: 😉
If the data has been processed properly, _Obsidian_ is an igneous, volcanic, felsic, aphanitic textured, form of Rhyolite. Feels like something was left out....no wonder Prof. Nick doesn't seem to care about "naming." ....don't blame him.
To partially answer "Evelyn's" question about "snowflake obsidian," the snowflakes are a type of quartz crystal. This occurs as a product of aging. Thus, snowflake obsidian is old or aged. Nothing viewed gave specific numbers, one source said no obsidian is older than the Cretaceous period (ended ~65 million years ago). Most Internet sites searched are about healing properties (be very skeptical) and its use in jewelry.
Long story short, obsidian has been an important resource, to Man, for hundreds of thousands - possibly millions - of years. It's use today is mostly as a semi-precious gem stone. In its deteriorated form, _pearlite,_ it's a useful addition to, or substitute for soil. In other words, _pearlite_ helps to grow healthy plants.
For other questions see: duckduckgo.com/?&q=conchoidal+fracture&ia=web or duckduckgo.com/ then, type in "conchoidal fracture" and click on the search icon (tiny leaning magnifying glass) or press the "Enter" key on the keyboard (I don't use touch screens or smart phones...sue me...😉).
No more Obsidian, I'm burned out...
Mr Rogers on clevage/cracks wahaha
Ah we missed an opportunity. Why high content silicas in the middle of land and low silica content in the middle of the ocean?
It's gneiss. Don't take it for granite.
I am a bot !
If we measure ancient, igneous rock, for silica, it will tell you how far away from water it formed. Therefore a map of how the earth grew.
U alcoholics r hilarious
If not crystals then what forms from explosion? Not nothing. You aren't going to tell me there are no explosions in the earth. Ha, we have earthquakes all day long. It's not possible to have earth movement without explosion and therefore crystals are formed all day long.
So much bs something is wrong here nothing about rocks