Research reveals that massive glaciers during global ice ages played a significant role in the rise of complex life. Geologists analyzed zircon crystals in ancient rocks to find evidence of glaciers carving deep into the crust, releasing key minerals, and altering ocean chemistry. These changes created conditions favorable for complex life.
The study focuses on Neoproterozoic Snowball Earth events, which occurred around 700-600 million years ago. After these global ice ages, single-celled organisms dominated the Earth until multicellular life evolved during the Ediacaran period. The researchers found that Australia’s Ediacara Hills provided critical evidence for both the glaciations and the rise of complex life.
The glaciers’ impact on geology and chemistry is a new finding. They actively shaped the land, influenced global geochemical cycles, and released minerals into the oceans. These minerals were rich in elements like uranium, which may have contributed to shifting geochemical cycles and creating conditions for complex life.
Geologists used zircon crystals, tiny time capsules of Earth’s history, to reconstruct how glaciers reshaped landscapes and influenced ocean chemistry. The study suggests that even after Snowball Earth melted, rivers and other processes further sorted and transported glacial debris, reshaping landscapes.
This research highlights the interconnectedness of Earth’s land, oceans, atmosphere, and climate. It provides context for understanding our future climate changes and their potential impacts on life on Earth.
Source: https://cosmosmagazine.com/earth/earth-sciences/ancient-glaciers-paved-way-for-life-on-earth