by Staff Writers
Boulder CO (SPX) Apr 20, 2017
Cretaceous climate warming led to a significant methane release from the seafloor, indicating potential for similar destabilization of gas hydrates under modern global warming. A field campaign on the remote Ellef Ringnes Island, Canadian High Arctic, discovered an astounding number of methane seep mounds in Cretaceous age sediments.
Seep mounds are carbonate deposits, often hosting unique fauna, which form at sites of methane leakage into the seafloor. Over 130 were found covering over 10,000 square kilometers of the Cretaceous sea floor. They occurred over a very short time interval immediately following onset of Cretaceous global warming, suggesting that the warming destabilized gas hydrates and released a large burb of methane. Given that methane has 20 times the impact of CO2 as a greenhouse gas, such a release could have accelerated global warming at that time. This discovery supports concerns of potential destabilization of modern methane hydrates.
A field campaign was run during 2009-2011 to map the geology of Ellef Ringnes Island. Around the same size as Jamaica, this is one of the most remote and difficult to access islands in the Canadian High Arctic, and as such not much was known about the geology.
A remote helicopter supported field camp was established in 2009, with a peak of 30 geoscientists working from the camp in 2010 as part of the Geological Survey of Canada's GEM Program. The island, and its neighbor Amund Ringnes Island, were named after brothers who founded Norway's Ringnes Brewery that funded the exploration of the region conducted by Otto Sverdrup in the early 1900s
As part of this work, Krista Williscroft, Stephen Grasby, and colleagues intended to reinvestigate strange spaghetti-like rock that was noticed, but the origin not understood, during the first geologic mapping of the island in the 1970s. Years later, a geologist saw a sample of this feature sitting on his colleague's desk and was intrigued by its spaghetti like nature. Chemical analyses revealed that this was a carbonate rock formed by the oxidation of methane, and the spaghetti texture was formed by fossil tube worms.
This was shortly after the first discovery of methane cold seeps in the modern oceans and became the first recognition of such features in the geologic record. In this case, it was known to have formed during the Cretaceous, the time of the dinosaurs roamed the earth, around 110 million years ago. Sadly, these original samples were lost, and given the remoteness of the location, it was not possible to gain more, limiting any further work.
Methane Cold Seeps
In the modern world, these sites are characterized by an unusual abundance of tube worms, bivalves (clams), molluscs, and other animals that survive on the microbial mats that grow there. In the rock record, they stand out as very unusual features that have this strange spaghetti-like appearance related to fossil tube worms and an abundance of other fossils. As they form in deep water they also stand out as resistant carbonate mounds in rock that is otherwise easily eroded shale.
Some hard walking through thick mud paid off when it was reached, revealing another fossil methane seep. From there a further mound could be seen, and on and on. This lead to more than four weeks of trudging from mound to mound through muddy tundra, and the discovery of over 130 methane seep mounds in the rock record. This is now one of the most extensive sites of these features known anywhere in the world, covering more than 10,000 square kilometers.
If correct, this has important implications for modern warming of the Arctic Ocean. Similar frozen methane hydrates occur throughout the same arctic region as they did in the past, and warming of the ocean and release of this methane is of key concern as methane is 20x the impact of CO2 as a greenhouse gas.
Release of methane hydrates has previously been suggested as a mechanism to drive runaway greenhouse events, as warming oceans releases trapped methane that causes further warming and releases more methane. The extensive methane seep mounds across the remote arctic island of Ellef Ringnes may be a caution from the past regarding potential impacts of modern warming of the Arctic Ocean.
Research paper: Extensive Cretaceous methane seepage, Ellef Ringnes Island, Canadian High Arctic Krista Williscroft, Stephen E. Grasby, Benoit Beauchamp, Crispin T.S. Little, Keith Dewing, Daniel Birgel, Terry Poulton, and Krzysztof Hryniewicz
Edmonton, Canada (SPX) Apr 20, 2017
Researchers at the University of Alberta have demystified the way that polar bears search for their typical prey of ringed seals. The answer, it turns out, is simple: they follow their nose using the power of wind. Using satellite telemetry data collected from 123 adult polar bears in Canada's Hudson Bay over 11 years, the researchers merged the movements of polar bears with wind patterns ... read more
Geological Society of America
Beyond the Ice Age
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