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Evidence From Hawaiian Volcanoes Shows That Earth Recycles Its Crust

Date:
November 30, 2006
Source:
Rutgers, the State University of New Jersey
Summary:
Rutgers University geological sciences professor Claude Herzberg offers new evidence that parts of the Earth's crust that long ago dove hundreds or thousands of kilometers into the Earth's interior have resurfaced in the hot lava flow of Hawaiian volcanoes. Writing in Nature, Herzberg claims to have found telltale chemical evidence at Mauna Kea that pieces of this submerged crust have been forced up through plumes and now make up most of this volcano's lava flow.
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Snow caps the summits of Mauna Loa (center) and Mauna Kea (toward the top, center) volcanoes on the island of Hawaii. This true-color image was acquired by the Moderate-resolution Imaging Spectroradiometer (MODIS), flying aboard NASA's Terra satellite, on February 28, 2002.
Credit: Image courtesy Jacques Descloitres, MODIS Land Rapid Response Team at NASA GSFC

A geologist at Rutgers, The State University of New Jersey, has come up with evidence our planet practices recycling on a grand scale.

Writing in the prestigious British science journal Nature, geological sciences professor Claude Herzberg offers new evidence that parts of the Earth's crust that long ago dove hundreds or thousands of kilometers into the Earth's interior have resurfaced in the hot lava flow of Hawaiian volcanoes.

"This concept has been a big issue in the earth sciences," Herzberg said. While it had been proposed earlier by some geologists, the profession hasn't embraced it because evidence until now remained sketchy. "Many geologists felt that when Earth's crust was forced deep into the mantle, a process called subduction, it would simply stay there."

Herzberg claims to have found telltale chemical evidence at Mauna Kea that pieces of this submerged crust have been forced up through plumes and now make up most of this volcano's lava flow. "The low calcium in the Hawaiian magma pegs it as crust that had melted and been forced to the surface," he said. The calcium levels in traditional magma, which comes from melting the Earth's mantle layer below the crust, are much higher.

Herzberg said his research doesn't stop in Hawaii and that his chemical findings will be useful in understanding the makeup and action of other volcanoes around the world. These findings extend beyond calcium and include sulfur, along with isotopes of the heavier elements hafnium and lead that are tracers for clays and other materials that originated close to the surface prior to subduction.

"Chemical patterns we've found elsewhere used to be puzzles but are now starting to make sense," he said.

Still, the big island of Hawaii remains the prime site for uncovering the secrets of volcanic action, as it has the largest volcanoes on Earth and is the most productive in terms of lava outpouring. Herzberg believes the information he's uncovered about magma chemistry might one day help scientists predict eruptions, as different chemical abundances show up at different times in the volcanoes' eruption cycles.


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The above post is reprinted from materials provided by Rutgers, the State University of New Jersey. Note: Materials may be edited for content and length.


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Rutgers, the State University of New Jersey. "Evidence From Hawaiian Volcanoes Shows That Earth Recycles Its Crust." ScienceDaily. ScienceDaily, 30 November 2006. <www.sciencedaily.com/releases/2006/11/061129151446.htm>.
Rutgers, the State University of New Jersey. (2006, November 30). Evidence From Hawaiian Volcanoes Shows That Earth Recycles Its Crust. ScienceDaily. Retrieved July 3, 2015 from www.sciencedaily.com/releases/2006/11/061129151446.htm
Rutgers, the State University of New Jersey. "Evidence From Hawaiian Volcanoes Shows That Earth Recycles Its Crust." ScienceDaily. www.sciencedaily.com/releases/2006/11/061129151446.htm (accessed July 3, 2015).

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