What do the Archean and Proterozoic mean?

1. The Archean (English: Archean) is a universe in geological time. The Archean began at the end of the period of heavy bombardment in the late inner solar system (isotope to the moon rocks.

The date was determined to be 100 million years ago), the Earth's rocks began to exist steadily and can be preserved to the present. The Archean ended 2.5 billion years ago with a great oxidation event to methane.

The predominantly reducing Archean primordial atmosphere was transformed into oxygen-rich oxidation.

The Proterozoic atmosphere and led to the first ice age of the Earth that lasted 300 million years.

Huron Ice Age.

2. The Proterozoic is an important metallogenic period, and the main minerals are iron, gold, uranium, manganese, copper, boron, phosphorus, and magnesite.

Wait. The Proterozoic isotope age ranges from 25-6 million years or (100 million years, a total of 1.9 billion years. The Proterozoic is divided into 3 generations.

25-1.8 billion years is Paleoproterozoic, 18-1 billion years is Mesoproterozoic, and 10-6 years or (100 million years is Neoproterozoic. Among them, the second half of the Neoproterozoic period, that is, 8-6 or (100 million years alone is called the Sinian.

The geohistory of the Proterozoic has the following characteristics.

The proposal of 2500mA as the Archean-Proterozoic boundary was adopted by the 28th International Institute of Geology.

It will pass, but it does not mean that 2500mA is the best choice for eternity as the Archean-Proterozoic boundary. In fact, there is still a lot of debate about where the Archean-Proterozoic boundary is drawn, and the current basis for dividing the boundary is also the same.

Other important staging criteria are inconsistent. A large number of data show that there was a catastrophe in the global geological environment at 2300 mA, and the geological processes before and after the catastrophe (especially the epigenetic geological process) had obvious changes, resulting in Archean.

A series of differences between the Zoic and the Proterozoic. This cataclysm has many similarities with geological events at important boundaries such as the Proterozoic-Phanerozoic, Paleozoic-Mesozoic, and Mesozoic-Cenozoic. Cataclysmic event at 2300 mA with .

The global tectonic movement of around 2500 mA is a more suitable choice marker for the Archean-Proterozoic boundary. The record of the 2300mA cataclysm in China is very clear.

Archean means as follows:

Archean (Archean) is a geologic epoch.

The Archean began at the end of the period of heavy bombardment in the late Inner Solar System (the isotope of the lunar rocks was determined to be 100 million years ago), and the Earth's rocks began to exist steadily and can be preserved.

The Archean ended 2.5 billion years ago with a major oxidation event that transformed the primordial Archean atmosphere dominated by methane into an oxygen-rich oxidizing Proterozoic atmosphere, leading to the Huron Ice Age, the first ice age on Earth that lasted 300 million years.

During the Archean period, bacteria and lower cyanobacteria were present.

The previous epoch of the Archean was the Plutozoic and the next was the Proterozoic, and the three epochs were once called "Cryptozoic". Including the First Archean, Ancient Archean, Middle Archean, and Neo-Archean.

The Archean was the initial stage of the emergence of primitive life and the evolution of organisms.

The Archean is an ancient period of geohistory. From the biological world, this was the initial stage of the emergence of primitive life and biological evolution, when there were only a small number of prokaryotes, such as bacteria and lower cyanobacteria, who left only a very small fossil record.

From the perspective of the abiotic world, the Archean is a period of thin crust, steep geothermal gradients, strong and frequent volcanic-rock or slurry activities, widespread deformation and metamorphism of rock strata, lack of free oxygen in the atmosphere and hydrosphere, and the formation of a series of special sediments. It was also a period of formation and growth of a silicon-aluminum crust, and an important period of mineralization.

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What is the original universe, and the Yuan universe is the virtual universe? Real-world network projection.

Archean is a geologic epoch. The Archean began at the end of the heavy bombardment period in the late Inner Solar System (isotope dating of lunar rocks was determined to be 100 million years ago), and the Earth's rocks began to stabilize and can be preserved to the present.

The Archean ended 2.5 billion years ago with a great oxidation event, when the reducing Archean primordial atmosphere dominated by methane was transformed into the oxygen-rich oxidizing Proterozoic atmosphere, which led to the Huron Ice Age, the first ice age on Earth that lasted 300 million years. During the Archean period, bacteria and lower cyanobacteria were present. The Archean belongs to the Precambrian period, the last one is the Plutozoic and the next Tanjian is the Proterozoic.

The Archean includes Archean, Archean, Middle Archean, and Neo-Archean. The Archean was the initial stage of the emergence of primitive life and the evolution of organisms.