Sunday, August 28, 2011

Mysteries About Carbon, Possible Oil Formation And More Deep Inside Earth

How do diamonds the size of potatoes shoot up at 40 miles per hour from their birthplace 100 miles below Earth's surface? Does a secret realm of life exist inside the Earth? Is there more oil and natural gas than anyone dreams, with oil forming not from the remains of ancient fossilized plants and animals near the surface, but naturally deep, deep down there? Can the greenhouse gas, carbon dioxide, be transformed into a pure solid mineral?

Those are among the mysteries being tackled in a real-life version of the science fiction classic, A Journey to the Center of the Earth, that was among the topics of a presentation here today at the 242nd National Meeting & Exposition of the American Chemical Society (ACS). Russell Hemley, Ph.D., said that hundreds of scientists will work together on an international project, called the Deep Carbon Observatory (DCO), to probe the chemical element that's in the news more often than perhaps any other. That's carbon as in carbon dioxide.

"Concerns about climate change have made millions of people aware of carbon's role on the surface of the Earth, in the atmosphere and in the oceans," Hemley said. "The Deep Carbon Observatory will uncover critical information about the movement and fate of carbon hundreds and thousands of miles below Earth's surface. We call that the deep carbon cycle."

Hemley said this basic research could have practical implications in the future. Using laboratory equipment that reproduces pressures deep within the Earth, which are thousands to millions of times higher than on the surface, scientists in these labs have discovered a way to convert carbon dioxide into a rock-like material called polymeric carbon dioxide. With further refinements, scientists could enhance its stability closer to the Earth's surface.

The findings also may lead to new materials for commercial and industrial products. Hemley's laboratory, for instance, has developed a way to produce "super" diamonds, or high-quality diamonds that are bigger and better than existing ones. Natural diamonds form slowly under the high-pressure, high-temperature conditions that exist deep within the Earth, while today's synthetic diamonds form under similar conditions in the laboratory. Using a process called chemical vapor deposition, Hemley's research group made diamonds rapidly and at low pressure. The new diamonds have superior qualities, including extreme hardness, improved transparency and better electrical and temperature properties. The diamonds could lead to improved computer chips that run faster and generate less heat than existing silicon chips, Hemley said. They also show promise for use in advanced cutting-tools, more durable and heat-resistant windows for spacecraft and other applications, he noted.

The DCO project will probe the big mystery about the formation of natural diamonds, including their chemical composition and how they shoot up quickly from deep within the Earth. Scientists can't directly observe that process at present, as there's no practical way to travel down 100 miles beneath the surface of the planet. Observations are limited to laboratory simulations of this process for now, said Hemley, who is director of the Geophysical Laboratory at the Carnegie Institution of Washington in Washington, D.C. His laboratory specializes in the chemistry and physics of materials under extreme conditions. Hemley's presentation at the ACS meeting, entitled "Chemistry of Planetary Gases, Liquids, and Ices in Extreme Environments," focused on what happens to planetary material under conditions of extreme pressure and temperature, as well as other insights relevant to Earth.

Another area that the DCO will explore is energy. The extent to which hydrocarbons in the Earth form from inorganic processes deep within the Earth rather than only from the fossilized remains of plants and animals remains an important unanswered question. Exploring the nature of carbon deep within the Earth may provide clues on how and to what extent this abiotic process might contribute to energy reserves, Hemley said.

Finally, DCO research has implications in the search for other life forms on Earth and even outer space. Scientists have already identified microbes at about a mile or so deep within the Earth under high temperatures. They suspect that some forms may exist at even deeper levels.

Past studies suggest that bacteria and other life forms can't survive beyond several thousand atmospheres of pressure. But new studies by scientists in Hemley's lab show that some bacteria are capable of surviving pressures of up to 20,000 atmospheres. That supports the theory that life might exist in extreme extraterrestrial environments, Hemley noted.

Contacts and sources:
Michael Bernstein
American Chemical Society

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