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Isua Greenstone Belt Banded Iron Nuuk Greenland
The Isua Greenstone Banded Iron Formation has been studied by scientists because the region contains evidence for the oldest, best-preserved ancient plate tectonic sequences on Earth. Within it are areas that have experienced relatively low deformation and alteration to the original rock sequences since the formation of our planet.
The Isua Greenstone Belt has preserved deformational events that are greater than 3.2 Ga., and is the oldest of all Greenstone Belts on Earth. The belt has an estimated age between 3.7 and 3.8 billion years and contains variably metamorphosed mafic volcanic and sedimentary rocks. With melting snow in the region, more is being revealed about the IGBF. Scientists think they had found what is biogenic material in the form of stromatolites, in 2016.
If this is ever agreed on and confirmed, this discovery of complex stromatolite structures at Isua so early in the history of the Earth would suggest that the earliest life on Earth could have evolved over 4 billion years ago. It is thought that the Hadean Earth’s surface conditions would make life difficult to evolve, due to early heavy asteroid bombardment. Scientists struggle with the “stromatolite evidence” as these features are open to interpretation and could be the result of geological deformation.
The geological evolution of the Isua Greenstone Belt remains controversial and the question of - does it hold evidence for the very earliest life remains for the time being, possible but unsolved.
Size: 35mm H X 23mm W X 22mm D, photos are of the front and side.
Ships with tag, tag stand and Certificate of Authenticity. Acrylic stand and photographic cube not included.
This specimen was obtained in a legal trade with a scientific institution.
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