Messy enough to create a diverse range of chemical interactions between the different tectonic areas.

Chemical interactions that could have well created the right conditions for early life to start and develop.

Link to article www.isterre.fr/english/news...

Now, scientists have found that different tectonic regions were doing different things, contrary to the notion that there was tectonic uniformity globally. It was messy and varied from parts of the planet having a stable crust, to others with signs of early plate-like movement.

This is key to getting an understanding of early Earth. Given that no early rocks are available from Earth’s first billion years, zircons from the oldest rocks are the only of looking into that era.

Zircons are a geoscientist’s time capsule or a kind of black box. These tough minerals, although minuscule, have survived for billions of years and have locked in chemical signatures from when they formed.

#geology #geoscience #tectonics

A bit of humour maybe, the photo shows tle petit train jaune, which goes through a bit of the French Pyrenees. Nice photo,but why not a TGV, which does go between cities.

Any link to an article?

#Geology in urban settings

This post is on London's stone-clad buildings, I'm on a geological treasure hunt, focusing this time on wonderful granites hidden in plain sight.

Hint: there’s an app for #urbangeology - on the website: London pavement geology, but it is about facades as well.

#Londongeology

Thousands of people walk past, every day, without ever giving a thought of the urban geology that surrounds them.

Clues:

One survived a southerly meteorite impact
The other carries a "lone star"
Ages: 3.08 billion years and 1.1 billion years old

Context: adorning a city merely 2,000 years old.