A Geologic Mystery in Madagascar; Solved at Last?

Рет қаралды 52,759

Күн бұрын

In Madagascar is a strange massive natural ring in the ground which measures nearly 10 miles or 16 kilometers across. This geologic oddity is not an impact crater or a caldera, but instead something completely different. This is the story of this still unnamed feature which formed due to its association with an ancient massive outpouring of lava known as a flood basalt.
Thumbnail Photo Credit: Google Earth, Image © 2024 Airbus. This image was overlaid with text and then overlaid with GeologyHub made graphics (the image border, the orange dashed line to indicate the feature's rim, & the GeologyHub logo).
NOTE: Collecting is NOT allowed, and neither is trespassing at Buell Park (in Arizona) which is ALL private property! Please do not trespass onto the kimberlite pipe in Arizona (which contains no diamonds) referenced in this video.
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Google Earth imagery used in this video: ©Google & Data Providers
This video is protected under "fair use". If you see an image and/or video which is your own in this video, and/or think my discussion of a scientific paper (and/or discussion/mentioning of the data/information within a scientific paper) does not fall under the fair use doctrine, and wish for it to be censored or removed, contact me by email at geologyhubyt@gmail.com and I will make the necessary changes.
Sources/Citations:
[1] MELLUSO, LEONE & Morra, Vincenzo & BROTZU, PIETRO & Tommasini, Simone & Renna, Maria & DUNCAN, ROBERT & Franciosi, L. & D'AMELIO, FOSCO. (2005). Geochronology and Petrogenesis of the Cretaceous Antampombato-Ambatovy Complex and Associated Dyke Swarm, Madagascar. Journal of Petrology. 46. 10.1093/petrology/egi044.
[2] White, S. M., J. A. Crisp, and F. J. Spera (2006), Long-term volumetric eruption rates and magma budgets, Geochem. Geophys. Geosyst., 7, Q03010, doi:10.1029/2005GC001002.
0:00 A Geologic Mystery
1:01 Ruling out Candidates
2:28 150 Million Years Ago
2:56 Flood Basalt
3:46 Doming

Пікірлер: 141

@scillyautomatic 20 күн бұрын

You are one steely eyed geology-man for figuring this one out!

@notmuch8078 20 күн бұрын

Large igneous provinces are one of my favourite things to learn about, I enjoys watching your volcano vids because I learn about volcanos and features I'd never heard of, keep it up ☺️

@genericalfishtycoon3853 20 күн бұрын

Hard to find any bright side to what's going on in Madagascar, but once the islanders finish completely deforesting the entire island here this year, and everything erodes away, it will probably be very interesting to study geologically. (You know, cuz it will be nothing but barren rock) 😢 RIP rainforest.

@zigzigler5111 19 күн бұрын

It will grow back. Not in our lifetime but sometime in the distant future it will be green again

@genericalfishtycoon3853 14 күн бұрын

@@zigzigler5111 I hope so bud, I really do.

@alanbiancardi2531 14 күн бұрын

It happens. I will not lose any sleep over it

@genericalfishtycoon3853 12 күн бұрын

@@alanbiancardi2531 🙄 "I'm so apathetic that I really care that you know it." Lol Ok bud but be careful with that edge alright?

@TaLeng2023 10 күн бұрын

Happens in many places. They'll reforest when they're forced to.

@davidsavage6227 18 күн бұрын

Could you do a video on Bermuda? I’ve read that the island is not sinking and may even be rising because of some kind of non-volcanic reason. Also, could you explain how Stone Mountain is growing? I always enjoy your videos and look forward to the next ones.

@thomasgoodwin2648 20 күн бұрын

Class is always in session. And so much easier with a classy teacher😉

@michaelnettles-kf2bl 20 күн бұрын

As always, I learned something. Thank you.

@ZebaKnight 20 күн бұрын

Very cool! I love your clear explanations and graphics. Both are especially helpful for complex situations like this one.

@panasclepias2937 19 күн бұрын

While we're taking requests, anyway we can get a video on the geology of Connecticut? I grew up there, and culturally it's a thoroughly boring place. But it's only in the last ten years that I've come to realize just how crazy the geology is there.

@TimNevins 19 күн бұрын

Good stuff, as usual! I enjoy the content, production, and presentation. The thing that blew my mind was that there are usually 40-something active volcanos going off.

@firestorm7919 19 күн бұрын

This video re-ignited my curiosity about that strange, massive almost perfectly circular formation northeast of Crater Lake in Oregon. I’d love for you to make a video explaining how that giant circle formed because it doesn’t look like it could be a caldera or impact crater.

@sgtbilkothe3rd 13 күн бұрын

There are already several web pages explaining this feature.

@trishkillian2459 20 күн бұрын

Thank you for the clear and understandable report.

@GingerMafia48 19 күн бұрын

this reminds me of the Vox video about a mysterious village that just popped up in the middle of a similar (if not the same?) formation on Madagascar they went to the island after talking with a PhD student who had studied the formation and gone there for field work years previously, and made contact with the village. overall, a pretty cool video about a pop up village in the middle of a geologic wonder which was discovered entirely through google maps!

@simix6915 19 күн бұрын

Speaking of this wonderful island, you should cover the mysterious maars and cinder cones on the northern part

@suzettebavier4412 20 күн бұрын

Thanks a whole bunch, Timothy

@BellaBarossa 19 күн бұрын

I noticed several years ago that Madagascar has a lot of circular features that are not volcanoes nor impact structures, or are not formally identified as either. These are especially noticeable on Google Maps when the terrain layer is on. I wrote to several geologists about these, but none of those who responded could offer much insight, except to say that there was a scarcity of data on many geological landforms on that island.

@xwiick 20 күн бұрын

Thanks for all of your hard work man!

@Mastercrack_GS 20 күн бұрын

How wonderful the laccoliths are, but the bad thing is that mining companies may come to want to exploit some of the precise minerals there are.

@paulw3182 19 күн бұрын

Great Video

@AuthenticDarren 20 күн бұрын

Wowzers! That sounds pretty rare!

@Astrofrank 19 күн бұрын

Quality content, as expected. ❤

@azopalinc 19 күн бұрын

Madagascar is so rich in gemstones!

@willtricks9432 20 күн бұрын

Great summary, Thank you.

@frankforce9241 19 күн бұрын

Thank you very much! I feel enlightened! Take care Frank

@baneverything5580 20 күн бұрын

Diamonds were found in Louisiana....and it quickly went hush-hush. To the east of where they were found I learned there is a buried volcano in Jackson, Mississippi.

@cacogenicist 20 күн бұрын

Diamonds in Louisiana could have bumped down the Mississippi, having eroded out of moraines left from the last glacial advance -- with the diamonds originally having been transported southward by glaciers that had advanced over kimberlites in Canada. Diamonds are occasionally found in moraines and creeks in the Midwest (along with a little fine gold, also from Canada for the most part).

@interstellarsurfer 20 күн бұрын

@@cacogenicistNo, there is no need for Canadian diamonds to explain anything. There are extinct, dormant, and volcanoes across the American south - Arkansas, Missisippi, Georgia, both Carolinas, and Florida. There is even a 'secret' exposed kimberlite pipe in a national park in Tennessee.

@genericalfishtycoon3853 20 күн бұрын

They found the largest lithium deposit on the planet right out behind my house here in Oxford county Maine. Thankfully it hasn't turned this beautiful area into a giant pit mine... Yet.

@interstellarsurfer 20 күн бұрын

@@cacogenicistThere are extinct, dormant, and active volcanos all across the American south. Tennessee doesn't have any documented volcanos - but it does have 'secret' exposed kimberlite pipes in a national park. Diamonds are everywhere.

@goldenhate6649 19 күн бұрын

From what I can tell, they would have to make one hell of an offer to get access to that property. The owners likely have mineral rights.

@user-pi4wj7bm4z 20 күн бұрын

An interesting article. Greg

@TheSpaceEnthusiast-vl6wx 19 күн бұрын

Thanks as always! It is always good to discuss these kinds of features, especially this unusual formation. I wonder if it has a name yet.

@barbasmas 15 күн бұрын

Hehe, so fun to see this. I think ive seen one other video on this on youtube somewhere. I myself found these on google maps in 2018, and later in 2019 wrote an essay on them for a small course on volcanism in Stockholm University. Now i work with something completely different, but it was so fun to explore. I theorised they would either be calderas or circular ring intrusions. I had been in touch with the geological society of madagascar to ask about them, and they happily provided with scientific reports about the general area. There are probably more of these geological formations further northeast, some bigger even, but less obvious. I think at least 4. Would love to see a part 2 of this video for the rest. Or the Androy complex/caldera to the south, if you havent already done it

@chasemclain6235 20 күн бұрын

Love these kinds of videos 🤗

@howieb3344 19 күн бұрын

Very interesting. Thank you and have a great day.

@susiesue3141 19 күн бұрын

Thanks for sharing! Very interesting. 😊

@EraX52 20 күн бұрын

Great video. I remember you had a video before of the Ilopango volcano in El Salvador, which was one of my favorite videos. Can you please bring the video back.

@xwiick 20 күн бұрын

The video was taken down due to license issues with photos/video's used along with many more video's so they all have to be remade sadly, He has remade several. I agree Ilopango should be a priority such fascinating system tho probably not as eye catching as Crater lake and other American Volcano's to the "normies"

@lukedawg2787 20 күн бұрын

Although slightly different but similar in how they were formed. You should look up Beacon Rock in Washington state. It is the massive core of an extinct volcano that was exposed during the massive floods of the Columbia River. So cool to visit knowing that you a climbing up the heart of a volcano that at some point looked like Mt Saint Helens or Mt. Rainier.

@abigalanderson7494 19 күн бұрын

Very cool I will have to check it out

@abigalanderson7494 19 күн бұрын

Mount stuart is from mexico

@ozzymandius666 20 күн бұрын

Fascinating.

@bavondale 17 күн бұрын

very cool explanation

@geradkavanagh8240 16 күн бұрын

I've only waited about 3 years for you to get back to this anomaly.

@RiddleBoxBree 20 күн бұрын

Any chance of doing a video on how fossils are formed? Its the most asked question i always get as a paleontologist!

@abhishekash8466 20 күн бұрын

Highly requesting.. story of Western ghats and Deccan traps formation in India .. Whether Madagascar India split created those mountains or not ..

@goldenhate6649 19 күн бұрын

Deccan traps were a seperate event if I am not mistaken

@rizkyadiyanto7922 19 күн бұрын

visnu created it, of course.

@jimmcintosh9045 19 күн бұрын

Looks a bit like the Ardnamurchan Peninsula caldera in West Scotland.

@Nightscape_ 20 күн бұрын

If this is true, feels like you should win a ticket for two to Madagascar.

@genericalfishtycoon3853 20 күн бұрын

Not going to be much left to visit at the rate they're deforesting the island. Check out satellite time lapses of the last decade. It's mind boggling.

@seanc6128 19 күн бұрын

Hey Mr. GeologyHub could you share some insight about what this large circular feature in Oregon is? 43°13'44.4"N 121°30'41.9"W

@matusknives 20 күн бұрын

Since you mentioned it - I would love if you would make a little more detailed video on Kymberlite pipes. The concept still sounds like science fiction to me because of my lack of knowledge on the topic.

@sabunkompas 19 күн бұрын

I think you can cover Indonesia's Eye of Borneo in South Kalimantan.

@genuinetuffguy1854 19 күн бұрын

You are like the Surerock…I mean…Sherlock Holmes of Geology.

@ModernProspector 19 күн бұрын

Kimberlite pipes are often found along the margins of collapsed calderas. Check out the Virginia Dale Ring Dike on the Colorado Wyoming border. Most of the diamondiferous kimberlites in this area including the now closed Kelsey Lake diamond mine are found within the ring dike. Perhaps a similar situation occurs there.

@chimknee 19 күн бұрын

Thanks.

@chazmiseroy9459 11 күн бұрын

There are three of those round structures in the center of Madagascar. If you zoom into the mountains around them you will see what looks like tree branches. Giant Cedar like petrified tree branches. The giant circles are giant tree trunks of trees that were cut down. They have nothing to do with lava. Zoom onto the mountains around the structures. You will see hundreds of branches and leaves. Zoom in and see for yourself.

@jordisalvadobuque1803 8 күн бұрын

Thanks. How many misteries has geological movements around the world 🌐!!! And Madagascar is one of them..🌐

@AlpakaWhacker 19 күн бұрын

Looking at satellite maps, there appears to be maybe what looks like 4 other similar looking structures in Madagascar in addition to the ones shown in your video

@paladinkhan 19 күн бұрын

Geology is cool 😎

@mfaizsyahmi 19 күн бұрын

It's Wall Sheena from Attack on Titan.

@StarScrier 16 күн бұрын

So no physical examination was done to find igneous rock, to verify this hypothesis? These types of formations can also be made from extreme examples of lightning.

@tornadoclips2022 20 күн бұрын

When’s the next update on the campi flegrei super volcano? I heard scientist telling citizens in Naples to evacuate

@souravjaiswal-jr4bj 20 күн бұрын

Not every eruption of a supervolcano is VEI 8. The eruption is inevitable but lacks the magma volume for VEI 8 or even 7. Most likely it will be VEI 5. The volcano is heavily studied, we would know months if not years in advance of an eruption.

@tornadoclips2022 20 күн бұрын

@@souravjaiswal-jr4bj that’s true but even a VEI 1 would be disastrous in the area

@El3andro 20 күн бұрын

The update is that recently a magma reservoir was discovered in just 5km depth. So far, scientists assumed only other fluids at that depth. Seems like the earthquake crisis of 1982-84 was also triggered by uprising magma. Those new results are based on a new study that analyzed all micro earthquakes from the past and were able to get new results. I just read about this in a volcano blog yesterday

@christopherlee627 19 күн бұрын

I wonder if a feature in Queensland, Australia, might interest you as it appears to be very similar. Having seen it on google earth I've wondered if it's an impact crater or of volcanic origin? I'd be interested to see if you think Mt. Goondicum is of similar origin to the Madagascan features?

@perrymaskell3508 19 күн бұрын

Could you please comment on the Chrissies Meer group of pools on the Easter / Central part of Mpumalanga province in South Africa? I'm convinced they are small impact craters due to their odd alignment, all form one incident.

@donutarmageddon7975 19 күн бұрын

Oh, cool, it's an Alan Smithee joint.

@genericalfishtycoon3853 18 күн бұрын

Sounds like something I'd pick up at the dispensary lol

@LuisAldamiz 19 күн бұрын

Cool. So that also explains the Eye of the Sahara? I must remember that phrase "domed anticline plus erosion" to slap into the face of the next one who claims it is Atlantis. TY.

@CricketsBay 17 күн бұрын

I think Geology Hub made a video explaining the Eye of the Sahara. And, yes, it is a domed anticline which has been eroded.

@TheSpiritombsableye 19 күн бұрын

Do you mean, Madagascar moved north from it's original location of Marion Island? 2:40

@ClariNerd 18 күн бұрын

So basically the same thing as Pawtuckaway or Ossipee.

@peronik349 19 күн бұрын

I heard (in a documentary on the history of England!) that Hadrian's Wall was partly built on a geographical and geological feature of this area which would be almost volcanic in nature! what is your opinion

@davidcranstone9044 14 күн бұрын

The central part of Hadrian's Wall is built on the outcrop of the Whin Sill. A sill is a layer of igneous rock that was intruded between two layers of the preexisting 'country rock',and the Whin Sill is one of the largest known extending from Teesdale almost to the Scottish border. Since it is very hard, and dips quite steeply to the south in the Hadrian's Wall area due to later earth movements, it forms a ridge with a cliff-like scarp edge facing to the north. The perfect line for Hadrian's Wall!

@m4a4sherman 11 күн бұрын

Can you do a video on the Ossipee Mountains ring dykes?

@zulea7883 19 күн бұрын

Didn't someone do a series on KZfaq visiting this?

@ilovecatsijustlovecats3944 11 күн бұрын

These are stumps of trees cut down before the flood

@Miparwo 20 күн бұрын

Could the Sea of Japan be a caldera resulting from a meteorite impact at its antipode?

@rizkyadiyanto7922 19 күн бұрын

pacific ocean is a caldera.

@rafaelcerrajerogimenez5907 19 күн бұрын

Possible... meteorith.. impacts.. 😮

@Kerbhunter_Alex 18 күн бұрын

Where andn when will the next flood basalt be? Is there anything known?

@VentureNW 19 күн бұрын

So the Eye of the Sahara isn't Atlantis? 😄

@johnmudd6453 12 күн бұрын

Aaaaarrrrrggghh the commentary !

@alanthecat59 20 күн бұрын

😻😻😻😻😻😻

@Shadoweknows76 19 күн бұрын

The remains of an ancient tree stump.

@pasqualelapelosa7365 17 күн бұрын

I hope you are being sarcastic

@k.c1126 20 күн бұрын

This looks like a structure I saw a video about a couple of months ago...

@foowashere 20 күн бұрын

On Vox.

@k.c1126 19 күн бұрын

@@foowashere You are right! kzfaq.info/get/bejne/nppihLmX17u6dqs.htmlsi=Jb6V-WXbUbsmNCQo

@pyalot 13 күн бұрын

The quintessential armchair geologist.

@ArmourProtected6-10 18 күн бұрын

WHY are the ads so long? Geesh.

@pansepot1490 14 күн бұрын

So, basically a pimple.

@FenderMinerals 19 күн бұрын

We both enjoy your videos and analysis very much. We have a request. We find the computerized voice much too monotone. It needs more inflection.

@davidcranstone9044 14 күн бұрын

It is not computerised, it is his real voice. And the reason it sounds a bit odd to some people is because he is autistic - he explains that in the intro to his Iceland drone flight livestream about a month ago. If you really can't stand his voice, mute it and follow the transcript.