Isua greenstone belt, Geological formation in southwestern Greenland.
The Isua greenstone belt is a geological formation in southwestern Greenland made up of volcanic and sedimentary rocks that were transformed by heat and pressure deep underground. The rocks here display layers of basalt, granite, and banded iron formations that tell the story of how the earliest parts of Earth's crust formed.
These rocks formed between 3.7 and 3.8 billion years ago, making them among the oldest rock sequences on Earth. Their study has allowed researchers to piece together how the earliest continental crust came into being.
Geologists from numerous research institutions conduct field studies at this location to understand the formation of Earth's early continental crust.
Reaching this site requires careful planning and specialized equipment because of its remote location in Greenland's wilderness. Visitors should come prepared for extreme weather and rough terrain, and arrange transportation well in advance.
The rocks here include pillow basalts that formed when lava erupted underwater, leaving behind distinct rounded shapes that reveal ancient ocean conditions. These preserved structures give geologists a rare window into what Earth's oceans were like billions of years ago.
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