Researchers have made a groundbreaking discovery on a remote island in the Canadian Arctic – the remains of an ancient glacier that could be over a million years old. This discovery is significant as it may represent the oldest glacier ice ever found buried in permafrost in the Arctic. The findings, reported in the January 1 issue of Geology, have captured the attention of researchers who are eager to study this ancient glacier before it is lost to melting caused by human-induced climate change.
The ice layers of a glacier contain valuable information about past climates and atmospheres, with gas bubbles, compounds, and particulates trapped within offering insights into the Earth’s history. While there are few reports of glacier ice older than the last ice age, which occurred between 26,000 to 20,000 years ago, the newly discovered ice presents a rare opportunity to study the climate of the early Pleistocene epoch. This period was characterized by alternating ice ages and warm interglacial periods, providing researchers with valuable data to understand past climate shifts.
The discovery of the ancient glacier came unexpectedly in 2009, when researchers were studying a fossilized forest on Bylot Island in Canada’s Nunavut Territory. Landslides triggered by permafrost thaw exposed translucent ice layers buried just above the fossil forest. Radiocarbon dating revealed that the ice was over 60,000 years old, surprising the researchers with its age. Further analysis of magnetic minerals in sediment layers above the ice indicated that the glacier could be at least 770,000 years old, with a maximum possible age of around 2.8 to 2.4 million years based on the age of the fossil forest.
The discovery showcases the resilience of permafrost, as the glacier has survived through warmer interglacial periods in the past. Despite projections of permafrost thawing in many regions by the end of the century, this ancient glacier has endured changing climates. Geomorphologist Daniel Fortier of the University of Montreal believes that permafrost may be more resilient than previously thought, emphasizing the importance of studying and preserving these rare remnants of Earth’s history.
Overall, the discovery of this ancient glacier offers a unique opportunity for researchers to delve into the Earth’s past climate and learn valuable lessons for the future. As the effects of climate change continue to impact the Arctic, efforts to study and protect these ancient ice formations are crucial for understanding the planet’s history and informing future environmental conservation strategies.
