SAN FRANCISCO — Scientists have discovered one of the world's weirdest volcanoes on the seafloor near the tip of Baja, Mexico.
The petite dome — about 165 feet tall (50 meters) and 4,000 feet long by 1,640 feet wide (1,200 m by 500 m) — lies along the Alarcón Rise, a seafloor-spreading center. Tectonic forces are tearing the Earth's crust apart at the spreading center, creating a long rift where magma oozes toward the surface, cools and forms new ocean crust.
Circling the planet like baseball seams, seafloor-spreading centers (also called midocean ridges) produce copious amounts of basalt, a low-silica content lava rock that makes up the ocean crust. (Silica, or silicon dioxide, is the main component of quartz, one of the most common minerals on Earth.)
But samples from the newly discovered volcano are strangely rhyolite lava, and have the highest silica content (up to 77 percent) of any rocks collected from a midocean ridge, said Brian Dreyer, a geochemist at the University of California, Santa Cruz. The results were presented last week at the annual meeting of the American Geophysical Union.
'A total surprise'
Researchers with the Monterey Bay Aquarium Research Institute (MBARI) discovered the volcano this spring, during a three-month expedition to the Gulf of California, the warm stretch of water that separates Baja from mainland Mexico. A remote-control vehicle explored the volcano, which is 7,800 feet (2,375 m) below the surface, and brought samples back to the ship.
"When we picked up the rocks and got them back on the ship, we immediately noticed that they were very low density, and they were very light, glassy and gray. They were not the usual dark, black, shiny basalts," Dreyer told OurAmazingPlanet. "So we immediately knew that something was unusual."
The volcano is primarily rhyolite and a silicic lava called dacite, said MBARI geologist Jennifer Paduan. "To find this along a midocean ridge is a total surprise," she told OurAmazingPlanet.
Boulders and blocks the size of cars and small houses littered the steep slopes of the dome, the robot's video camera showed. The gravelly debris is made of lava that resembles the ragged surface of a'a (rough, rubbly or blocky lava). The flows would have been deposited via large, avalanchelike deposits, Paduan wrote on the expedition's blog. A few ridges were composed of very strange, steeply dipping, lineated flows very different from the pillow-style appearance of deep-sea basalt, she wrote.
The researchers don't yet know how the age of the volcano because their samples haven't finished undergoing the necessary tests. The dome is probably several thousand years old, MBARI geologist David Clague said in an email.
Could it go boom?
Of more concern is the evidence for explosive volcanism, which is typical of rhyolite volcanoes, Paduan said.
"It's only 100 kilometers [60 miles] from land. When the sun is setting, you can see Cabo," she said. Both the Baja Peninsula and mainland Mexico near Alarcón Rise have cities and luxury resorts. The Gulf of California is also home to endangered sea life.
Rhyolite lava carries more gas and volatiles (things that are likely to cause explosions) than basalt, and when magma meets water, it vaporizes instantly, driving an even more explosive eruption.
"There's definitely explosive deposits there, and that is of extreme concern, given that the ridge is so close to land and the tsunami potential of a big explosion there," Paduan said. "We don't know how explosive, and that is something we are definitely trying to figure out."
The researchers also found Pele's seaweed, or limu o pele, at another location on the 30-mile-long (50 km) ridge. These are little fragments of lava formed from explosive magmatic gas bubbles that implode when they hit cold seawater. "We did find evidence of mildly explosive eruptions on the ridge," Paduan said.
Why is it there?
Rhyolites have been found on spreading centers, but only above hot spots, such as in Iceland and the Galapagos Islands, Dreyer said. Hot spots are plumes that bring magma to the surface from deep within Earth's mantle. There is no hot spot under the Alarcón Rise, he said.
Rhyolite lava typically occurs only on continents, such as in Mount St. Helen's growing dome in Washington. One possible explanation for the bizarre composition of the Alarcón dome is that continental crust snuck into the molten rock below — the spreading center is young, and continental crust lies close by. But tests of different isotopes (versions of elements with differing numbers of neutrons in the cores) in the lava samples revealed no evidence of contamination by continental crust, Dreyer said.
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