Unusual geochemical signature in Arctic ocean floor basalts
Earth’s tectonic plates are constantly moving. Over millions of years new plates form at oceanic ridges, while others form mountains or even sink back in the mantle and disappear from the surface. The unique geochemical signature of sunken plates can be preserved and reappear in newly formed crust.
From Antarctica to Australia: Mighty River’s Story Revealed
A group of researchers have traced a mighty Gondwana river back to its distant source - in the mountains of East Antarctica. They’ve been able to show that this colossal river flowed for over 200 million years, making it a candidate for one of the top ten longest-lived rivers in Earth’s history.