Earth Science: Prelude to Geologic Age
For some 800 million years (4.6 billion years ago ~ 3.8 billion years ago) after the Earth 's birth, the Earth enters the age of geology called ‘Hadean Eon'.
What is Eon?
In the geology, it is used as the largest unit that distinguishes the geological era.
Both Eon and Aeon are used.
The geological age is divided into four eons.
In chronological order
- Hadean : 4.6 billion years ago ~ 3.8 billion years ago
- Archean : 3.8 billion years ago ~ 3.8 billion years ago
- Proterozoic : 2.5 billion years ago ~ 540 million years ago
- Phanerozoic : 540 million years ago ~ today
Image Credit : Wikimeda Commons
The Paleozoic, the Mesozoic, and the Cenozoic, which we have heard once, are all in the Phanerozoic.
Everything we learned was a Phanerozoic.
Paleozoic is divided into six again, Cambrian is the first beginning.
Cambrian, Ordovician, Silurian, Devonian, Carboniferous, Permian
It is called “Pre-cambrian period" by tying up the Hadean, Archean and Proterozoic.
It is similar to prehistoric times before the age of history.
It is hard to know what we want to know about Hadean. Because there is no evidence. There are few rocks and minerals that have remained to date.
As a matter of fact, I have never heard the name of ‘Hadean'.
However, this is what we expect.
- The earth was very hot,
- It was full of volcanic activity.
- There was no sea at the beginning.
It was a hellish environment.
So, when did the earth become like earth?
The earth, which was boiled after colliding with Taea, gradually cooled down with pouring heat into space. At 5500 degrees Celsius, the Earth's temperature gradually dropped. At about 1500 degrees Celsius, the magma solidified and rocks were formed.
Silicate minerals such as olivine and olive rock have been produced, which are the main component of the upper mantle.
The location of the upper mantle is roughly here, Image Credit : Wikimeda Commons
Most of them are the first words I've ever heard.
Yap. Just leave it at that.
Minerals are units that make up rocks. It is the 'minerals' that we are familiar with.
Mineral? This is familiar. There is mineral water.
Ya, Mineral water is water containing trace of minerals.
Geologists investigate minerals to find traces of Earth history. In order to know the old past, we have to find old minerals.
This is suitable minerals.
https://www.google.co.kr/search?q=Zircon&tbm=isch&source=lnt&tbs=sur:fmc&sa=X&ved=0ahUKEwjSqbjQqIbYAhUKfrwKHceiC_4QpwUIHA&biw=1244&bih=573&dpr=2#imgrc=5IZ5BpOvXkpRZM:
What’s this?
‘Zircon’
Please let me know if anything has to be corrected :)
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