1,000 to 520 million years ago, Earth’s climate was undergoing dramatic changes. From icy extremes in what some have termed Snowball Earth, to warmer conditions as an increase in oxygen led to the Cambrian explosion of biodiversity, it’s a period of the planet’s climate history we knew little about – until now. Scientists recently created the first ever global map of plate tectonics during this time, shedding light on their influence on other Earth systems.
Tectonic plate movement helps researchers understand how life evolved and how Earth’s climate changed. But there was around a 500-million-year gap that a group of 12 researchers in Australia and Canada just filled in with their new map, which they describe as the “first whole-Earth plate tectonic map of half a billion years of Earth history.”
The researchers were able to draw up the map by studying rocks that formed near where tectonic plates meet or where they ripped apart. The rocks came from Brazil, Ethiopia, and Madagascar. The scientists said the work took them a few decades. Their map offers new details, further back in geological time, than we had before.
Two of the co-authors on a paper in press at the journal Gondwana Research wrote a piece for The Conversation detailing their map and the role of plate tectonics in our planet’s climate and the evolution of life. Andrew Merdith of the University of Sydney and Alan Collins of the University of Adelaide said the lack of ancient tectonic maps has made it difficult for researchers trying to unravel the mysteries of the past. They wrote, “Understand ancient plate tectonics and we go someway to understanding the ancient Earth system. And the Earth as it is today, and into the future.”
Via The Conversation
Images via Andrew S. Merdith, et al.