Norway’s oldest rock found
"From the analyses we see that this rock was formed from magma that solidified 3,002,000,000 years ago. This means that it is Norway's oldest known rock", explains Slagstad and Hansen. "We found the sample south of the Lakselv in Finnmark. The previous "record" of this type is just under 3 billion years. Researchers also found that sample in Finnmark, which supports the hypothesis that the region is home to Norway’s oldest rocks. Hopefully, we find even older rocks in this area in the future", they add.
Closer to the process that shaped the earth
The age of the planet Earth has been estimated to be ca. 4.6 billion years. Understanding more and more about old rocks gives us new knowledge about the evolution of Earth, from its formation to the present day. We want to know more about the natural processes that have shaped Earth and created the prerequisites for life.
"If we go back one or two billion years, the geological processes that dominated back then are quite like those that are operating today. However, we are more uncertain about the conditions before that time. We know that the Earth's interior was hotter, which led to vertical motion due to convection (hot geologic material rises and colder material sinks). On the other hand, horizontal movements of crustal plates dominate on Earth today. By identifying and studying even older rocks, we can look forward to a better understanding of the Earth’s early history, they concluded", without stifling their excitement or their smiles.
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