Turbidites

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What turbidites are, how they are formed, and their most important sedimentary features. Includes a short introduction to the Bouma Sequence. Suitable for students undertaking a university Geology course or equivalent.
All images used, unless otherwise stated in the video, are either my own property or exist in the public domain.
Music: 'Island Coconuts' by Aaron Kenny (public domain)

[@josegabrielcordova4079]

Great Video, thank you so much for making it!
Recently I read an article that says that ..."turbidity currents also involve large-scale sediment movements within the seafloor." Could you tell me, what do you think about this hypothesis?
Do you agree? Here is the link to the article.
www.usgs.gov/center-news/large-underwater-experiment-monterey-canyon-shows-turbidity-currents-involve-seafloor
Also, could you make a video about marine sediments?
Thanks again

[@ThomasStevensontutor]

Hi there, thanks for getting in touch! I just finished reading the paper and yes, it's a reasonable conclusion. Amazing to think that researchers are just now getting to know real turbidity currents in the ocean. :)
I'm currently making a series of videos about sedimentary rocks and will try to make time for one specifically about marine sediments. There's a lot to talk about there, so thanks for the suggestion!

[@amacuro]

It depends what you call "large-scale", my guess is that this is a relatively subjective term.
But in my experience, the biggest turbidity currents (in average) are the so-called MTDs, or Mass Transport Deposits. These occur when "large" (or any size) sedimentary sections of the continental slope become unstable and a subsea landslide initiates.
There are different trigger mechanisms, one of them being earthquakes. Tectonic activity has the capacity to destabilize large amounts of sediment in the continental slope, especially if the fault is a long one.
This is a separate subject, but those MTDs are usually rich in mud and usually have little economic value for us petroleum geologists :D

[@paulbriggs3072]

Debris flows answer for much more of the earth's surface appearance than anyone suspects.

[@murph_mustela]

Well made video. Reminds me of the kind of stuff I used to watch on a Saturday morning as a kid. I'm watching this for my Earth Science course now.

[@dielauradie]

You're doing great job ! As a geology student, it helped me a lot. Pls keep going.

[@mightymoose1158]

Thank you! I worked at the Cambrian-Ordovician GSSP in Newfoundland. This helps me understand the site much better!

[@Voy2k23]

I would really appreciate a video done for sediments found on the three existing environments. And this was a helpful video by the way.

[@ThomasStevensontutor]

Thanks for your feedback! I have quite a lot happening right now, but I will try making a video on sediments when I am free again. :)

[@praveenks2882]

Thank you Mr.Thomas...interesting to learn this way...your voice, the visuals, back ground music keeps the brain engaged...

[@hibamichealnaouiri7858]

thank u so much it really helps me i have no idea why your channel has not much followers

[@abrarshaik8525]

Man Stevenson....what is that explanation....crazzzzyyy!!! One of best explanation I've seen.
Please make many more of this kind.
Can you help me in mastering Geography??

[@ThomasStevensontutor]

Maybe. What else would you like to learn about? I might be able to create a video about it soon.

[@gillesdeleuze6083]

Thanks man! Great job! Cheers from Brasil

[@florenciamilanese5256]

Hi Thomas. I understand that any flow deposits bigger clasts first if it looses energy with time. So I picture the sequence pebble-sand-mud in an horizontal dimension. I do not completely understand why you see this sequence represented in a vertical stack. I hope the question is clear enough. Very nice video. Thanks!

[@mayazahab4746]

This helped a lot. Thank you.

[@karlaarroyo6573]

Excellent video! Thanks!

[@abukhalilomani4664]

Thanks, very clear explanation!

[@sonalichakraborty4305]

thank you for the explanation.

[@akashnair9395]

Amazing video! I loved it.

[@ablamakhlouf9138]

Great video THANK YOU SO MUCH

[@romilotcheris5767]

This is a great video!

[@fahrizalamir1]

Great video!! Thank you

[@almahmudtaha7641]

Great video. Would love to see more like this

[@priyadas3046]

Your vedio is full of information❤

[@Sankavi143]

Wow!!! Explain Submarine Canyons??

[@tariqaziz8566]

very informative video. can you please make a lecture series on deep water seismic sedimentology/seismic sequence stratigraphy and deep water depositional system.

[@jaysipe9355]

so then why is this not just considered a debris flow?

[@ThomasStevensontutor]

Good question! The main difference is that in a turbidity current, sediment grains are supported and carried by turbulent water. In a debris flow, sediment grains are supported by contact with each other, or by a much lower proportion of water that isn't turbulent. Hope this helps. :)

[@amacuro]

@@ThomasStevensontutor great answer. Both debris flows and turbidity currents fall under the more general term Gravity Flows. As Thomas correctly said, a debris flow is usually coarser grained and it just flows along the bottom of the seafloor. Whereas turbidity currents have lighter grains that allow the column of water to mix inside of them as they advance downslope, creating turbulence within the flow and incorporating a % of the total sediment into the water column.
Additionally, a debris flow wouldn't exhibit a Bouma sequence texture like a turbidity current would. A debris flow texture would be more chaotic in general.