Scientists have discovered something interesting in Greenland that provides evidence that a large portion of the Earth was once completely molten rock. Evidence came from eons old rocks found in southern Greenland. Researchers say little is known about Earth and conditions on this planet during the Hadean Eon. This period was marked by the initial formation of the Earth and the stability of the planet’s core and crust.
Earth’s early atmosphere also formed during the Hadian era. studying Published last week, it presents the results of work analyzing billions of years old rocks from the Isua supracrustal belt that contains the oldest known rocks on the planet. During their research in the rocks, scientists found chemical traces of ocean magma.
The samples whose chemical traces were discovered date back 3.7 billion years and showed high levels of heavy iron isotopes that were measured using chromatography and mass spectroscopy. The team also discovered isotopes of hafnium and neodymium along with rare isotopes of tungsten, which they say stem from the “ancient parent isotope” that was only present during the first 45 million years of Earth’s life.
The researchers said that hafnium and neodymium are the most interesting isotopes that have been discovered because they are extremely difficult to modify and require detailed investigations into their chemical composition. Ultimately, the researchers found that iron isotopes confirmed that Isua rocks formed from parts of Earth’s interior that formed 4.5 billion years before the ocean magma crystallized.
The crystal remnants melted and mixed with other molten rocks when they moved to Earth’s upper mantle, carrying isotopes along with rocks from both the lower and upper mantle. Scientists admit that how the material appeared on the surface is less clear. Some scientists believe that catastrophic impacts during the formation of the Earth and the Moon could generate enough energy to melt the Earth’s interior. This material would eventually have cooled and crystallized, forming rocks of the type that scientists discovered.