Cryovolcanism on dwarf planet Ceres: molten water instead of molten silicate rock

Volcanic dome Ahuna Mons rises above a foreground impact crater, as seen by Nasa's Dawn spacecraft with no vertical exaggeration. Eruptions of salty, muddy water built the mountain by repeated eruptions, flows, and freezing. Streaks from falls of rocks and debris run down its flanks, while overhead views show fracturing across its summit. Source: Science

The low-temperature volcanic activity created an ,iceberg’ with 5200 m height on the celestial body between Mars and Jupiter

Ahuna Mons is a volcano that rises roughly 5200 m (13,000 feet) high and spreads 20 km (11 miles) wide at its base. This would be impressive for a volcano on Earth. But Ahuna Mons stands on Ceres, a dwarf planet less than 330 km (600 miles) wide that orbits the Sun between Mars and Jupiter. Even stranger, Ahuna Mons isn’t built from lava the way terrestrial volcanoes are – it’s built from ice.

„Ahuna is the one true ,mountain’ on Ceres,” said David Williams, associate research professor in Arizona State University’s School of Earth and Space Exploration. „After studying it closely, we interpret it as a dome raised by cryovolcanism.“ An iceberg, so to say.

Cryovolcanism is a form of low-temperature volcanic activity, where molten ice – water, usually mixed with salts or ammonia – replaces the molten silicate rock erupted by terrestrial volcanoes. Giant mountain Ahuna is a volcanic dome built from repeated eruptions of freezing salty water.

Williams is part of a team of scientists working with NASA’s Dawn mission who have published papers in the journal Science. His specialty is volcanism, and that drew him to the puzzle of Ahuna Mons.

„Ahuna is truly unique, being the only mountain of its kind on Ceres,“ he said. „It shows nothing to indicate a tectonic formation, so that led us to consider cryovolcanism as a method for its origin.“

Dawn scientist Ottaviano Ruesch, of Nasa’s Goddard Space Flight Center, Greenbelt, Maryland, is the lead author on the Science paper about Ceres volcanism. He says, „This is the only known example of a cryovolcano that potentially formed from a salty mud mix, and which formed in the geologically recent past.“

Williams explained that „Ahuna has only a few craters on its surface, which points to an age of just couple hundred million years at most.“

Dawn's Framing Camera looks down on the fractured summit of Ahuna Mons, tallest mountain on dwarf planet Ceres. The cracks on top suggest Ahuna grew by inflation: icy freezing water pushed up inside the mountain, making a dome. Source: Science

According to the Dawn team, the implications of Ahuna Mons being volcanic in origin are enormous. It confirms that although Ceres’ surface temperature averages almost -40° (Celsius or Fahrenheit, the scales converge at this temperature), its interior has kept warm enough for liquid water or brines to exist for a relatively long period. And this has allowed volcanic activity at the surface in recent geological time.

Ahuna Mons is not the only place where icy volcanism happens on Ceres. Dawn’s instruments have spotted features that point to cryovolcanic activity that resurfaces areas rather than building tall structures. Numerous craters, for example, show floors that appear flatter than impacts by meteorites would leave them, so perhaps they have been flooded from below. In addition, such flat-floored craters often show cracks suggesting that icy „magma“ has pushed them upward, then subsided.

A few places on Ceres exhibit a geo-museum of features. „Occator Crater has several bright spots on its floor,“ said Williams. „The central spot contains what looks like a cryovolcanic dome, rich in sodium carbonates.“ Other bright spots, he says, occur over fractures that suggest venting of water vapor mixed with bright salts.

„As the vapor has boiled away,“ he explained, „it leaves the bright salts and carbonate minerals behind.“

Nasa plans for Dawn to continue orbiting Ceres and collecting data for another year or so. The dwarf planet is slowly moving toward its closest approach to the Sun, called perihelion, which will come in April 2018. Scientists expect that the growing solar warmth will produce some detectable changes in Ceres’ surface or maybe even trigger volcanic activity.
„We hope that by observing Ceres as it approaches perihelion, we might see some active venting. This would be an ideal way to end the mission,“ said Williams.



Arizona State University

(06.09.2016, USA: 09.06.2016)