Thank you for this nice presentation, very educational.

I've come up with an entirely different theory to explain the shape of the greenstone belts. What if they reflect something like dunes, but on the interior side of the crust? When the earth was young and hot, perhaps there were dune-like deposits on the inner side of the crust that were shifted as dunes by wind. Eventually, the interior side of the crust would have been levelled and the combs of the dune pushed upward, creating mountains, between which the sea flowed in, allowing for the shallow sea materials to form.

A priori, in Archean times, we can't exclude internal mantle forces that would have simply pushed the oceanic crust upward. Also, is it really impossible that the Greenstone belts were pushed upward by enormous amounts of underplating?

As I understand it, the continental accretion works because mainly shallow waters are being eliminated.

One extension of the back arc model one could come up with is that the compression event is weakened by competing downward magma streams on the left in the picture, allowing the process to repeat itself on the right part of the islands. In case of an equal split of the original island arc, we would then see though that the overall volume of the stripes decreases exponentially in one direction.

Wouldn't the presence of sandstones, limestones and banded iron formations suggest that the greenstone (which formed at a deep sea environment) was later lifted by plate tectonics to shallow sea environments, where the sandstone etc. deposits formed?

I also wonder what clouds would have looked like in the early earth's atmosphere (if they even existed). Would they have also been white, or rather tainted like on Venus? That may also have affected the amount of radiation absorbed by the clouds.

I wonder: About the Titanium experiment, were the zircons all dated differently, or are we simply given some confidence interval? If the former option is true, it may be interesting to look at whether zircons from 4.1 Ga or younger show more signs of low temperature melting, which would favour the theory of Late Heavy Bombardment water addition.

Excellence in boring, therefore good #bedtimelistening

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Yo Mr. White! Yeah, science!

amazing

thank you

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Could you do this series with a focus on Gondwana too? This series is really good but its mainly focused on Laurasia..

Dr White has a very rare gift: the genius for explanation: for putting the right word in the right place, at the right time. Much appreciated by those of us who struggle, not just to apprehend, but to comprehend the complex web of relationships that must be established, between these “words”, so that the story can stick - take hold and take shape- in our memory.

Transgressing facies... Can't get away from politics anywhere

When do you get to south America?

A geologist going climate propagandist?

This guy has the best videos ever.

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Welcome back, Dr. White.

“Helloo everybody “

If BIF is predominantly shallow marine then tidal movement provides cyclic process alowing a shallow estuary to increase in disolved oxygen during day and low tide, also with river inflow to estuary also add disolved oxygen from atmosphere... Then tidal inflow of reduced sea water with high disolved iron mixing and precipitate the iron oxide hydroxide minerals. Disolved silicate could then precipitate as silica gel microspheres with the water chemistry cycling between 2 differing redox potentials?

Stromatolite survival in hypersaline lakes that didnt freeze due to high salinity?

Thanks again for an awesome lecture . Serpentinisation of olivine is exothermic and creates "white smokers" with lower temperature hydrothermal vents ... Providing similar less extreme and potentially longer lived vent chimneys - do these also represent life genesis targets?

Very understandable explanation thankyou. I'm currently trying to understand the yilgarn. Always I lots of questions Liquid water exists at base of very thick ice due to high pressure... Serpentinisation is exothermic as soon as Ocean crust, water and carbon dioxide interacted there should have been chemical heat sources. Serpentinisation also decreases density and creates hydrated minerals... Could serpentinisation created more buoyant Ocean crust? Phylosilicates are slippery and could penetrate deep faults priming with wet clay to facilitate subduction?

I have to say one big part of listening to your lectures is because I like your voice.

This guy knows all the orogenous zones.

The first comment...

Thank you for the video. It’s nice to feel like I’m back at university without midterms and finals.

Just finished the complete series. Thank you so much for uploading all of this. It has been a wonderful experience.

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Please share pdf / ppt or else the reference material .

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A dense carbon atmosphere from the smouldering volcanic ball the earth once was, the atmosphere was clearly created from the gas exited the cooling of the volcanic mass the earth began as. This negated the suns lower heat emissions over 4 billion years ago ✌️❤️🇬🇧

I really enjoy your lectures. Sadly many otherwise interesting lectures suffer from bad audio but your audio is perfect!

did i just stumble on free knowledge? fantastic, thank you!

Could it have been that Mars was an ice world, with volcanoes warming the bottom water?

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The first comment: I love the good Doctor but not sure why.

Doubling the atmospheric CO2 does not double the "greenhouse effect". Just like doubling the power in a stereo speaker system. If you are blasting out music at 100 watts (loud), and double the output to 200 watts, it does not get twice as loud. You only get a 3 decibel gain. Double it again to 400 watts, another 3 dB gain. Double it again to 800 watts, another 3 dB gain.

Yay more content

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History at its best! The narrative set forth with utmost clarity, the various components drawn together and put in order with a sense of line - and purpose - which is nigh unheard-of, in this discipline. And most needful. Thank you - thank you!!! - Dr White.

Thank you from a geology graduate from 1973 who changed careers a year later.