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Chapter 11: Problem 6

Why did magma rise from the mantle to Earth's surface at a higher rate during Archean time than it does today?

Short Answer

Expert verified
During the Archean time, the Earth was hotter and had higher levels of tectonic activity due to its early stage of development and the presence of radioactive isotopes. This resulted in the mantle being more fluid and partially molten, generating more magma. Additionally, the presence of smaller and more mobile plates increased volcanic and tectonic activity, facilitating the rise of magma from the mantle to the surface. As a consequence, magma rose to the Earth's surface at a higher rate during the Archean time than it does today.

Step by step solution

01

Understand the Archean time period

The Archean time period is geologically significant because it represents the early development of the Earth, around 4.0 to 2.5 billion years ago. During this time, the Earth's crust was still forming and the planet was much hotter than it is today. The high temperatures, combined with other factors, caused magma to rise from the mantle at a higher rate than it does today.
02

Examine the temperature of Earth during the Archean time

The Earth was much hotter during the Archean time than it is today. This was mainly due to the higher concentration of radioactive isotopes and the residual heat from the planet's formation. The higher temperature, along with other factors, caused the Earth's mantle to be partially molten, and as a result, magma was generated at a higher rate.
03

Investigate the tectonic activities during the Archean time

During the Archean time, the Earth's tectonic activity differed from today's plate tectonics. Instead of having large, stable plates, the Archean Earth had smaller and more mobile plates. This increased the occurrence of volcanic and tectonic activity, which facilitated the rise of magma from the mantle to the surface.
04

Understand the difference in the rise of magma rate

As a result of the higher temperatures and increased tectonic activities during the Archean time, the mantle was more fluid and easy to melt, leading to the production of more magma. The magma, being less dense than the surrounding solid mantle, rose to the surface at a higher rate compared to today.
05

Conclusion

During the Archean time, the Earth was hotter and had higher levels of tectonic activity due to its early stage of development and the presence of radioactive isotopes. These factors caused the mantle to generate more magma than it does today. Alongside the increased mobility of the smaller plates, magma was able to rise to the Earth's surface at a higher rate during the Archean time compared to the present day.

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