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Found! The Largest Source of Dust on Mars – Sky & Telescope

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New outcomes present that the Medusae Fossae Formation, a set of broad and enigmatic plains, offers a lot of the high-quality mud discovered in every single place on the Martian floor.

Because the current planet-wide dust storm on Mars dramatically demonstrates, the Martian environment could be skinny (its floor strain is barely zero.6% that at sea degree on Earth), however its winds can shortly mobilize unimaginable quantities of high-quality particles. By one estimate, some three billion tons of mud cycles between the planet’s floor and environment every year.

But to change into airborne, these particles have to be extraordinarily small, microscopic motes not more than 50 to 100 microns throughout, and for many years researchers have struggled to search out geologic processes on Mars that function effectively sufficient, and for lengthy sufficient, to generate all that silty grit.

Now a quartet of researchers believes they’ve pinpointed the primary supply of Martian mud. It is known as the Medusae Fossae Formation (MFF), a patchwork of plains straddling the planet’s equator which have intrigued geologists for many years.

Map of Medusae Fossae Formation

The in depth Medusae Fossae Formation seems to contain a layer of high-quality mud, a whole lot of meters deep, emplaced by gas-driven volcanic eruptions about three billion years in the past.
Nature Communications / Lujendra Ojha et al

If this identify appears acquainted, it is as a result of a current research argues that MFF’s thick blanket of sediment seemingly resulted when a Martian supervolcano erupted about three billion years ago.

And ever since, say Lujendra Ojha (Johns Hopkins College) and his colleagues, the gradual however incessant erosion of the MFF has created a lot of the present-day mud on Mars.

The MFF covers an space that’s equal to about 20% of the continental U.S. Nevertheless, disconnected components of it may be discovered everywhere in the Pink Planet, and when created it might need lined 2½ occasions extra of the Martian panorama. “We do see remoted sections of MFF which are unfold out, and that is how we all know it was a a lot greater unit,” says Ojha. “A big a part of it has gotten eroded.”

Ojha’s workforce discover this chance in July 20th’s Nature Communications. You may learn a well-liked abstract of this geologic detective story in aJHU press release.

In contrast to on Earth, the place a lot of the mud is trapped by our bodies of water, Martian mud floats in environment or settles on the bottom. Knowledge collected by Mars rovers present that each one this mud, if unfold out evenly across the planet, would create a layer about Four meters thick.

So how a lot erosion has occurred in MFF? Ojha’s group finds that over time the area has misplaced, by way of wind-driven erosion, sufficient mud to mantle the entire planet to a depth of two to 12 meters, so the precise Four-meter thickness suits properly with this end result.

Medusae Fossae Formation HiRISE 480p

Streamlined options and remoted mesas that present the extent of wind erosion within the Medusae Fossae Formation. This picture was acquired by the Excessive Decision Imaging Science Experiment (HiRISE) digicam onboard the Mars Reconnaissance Orbiter.
NASA

As well as, earlier rover knowledge present that Martian mud is extraordinarily wealthy in sulfur and chlorine, and has a definite sulfur-to-chlorine ratio. When Ojha’s workforce used a gamma-ray spectrometer on NASA’s Mars Odyssey orbiter to infer the chemical composition of the MFF, they discovered that MFF can also be extraordinarily wealthy in sulfur and chlorine and has the identical sulfur-to-chlorine ratio as Martian mud. it seems that no different area on Mars has these similar chemical traits.

Ojha thinks that the Medusae Fossae Formation made a big contribution to the whole present quantity mud on Mars — maybe as a lot as half of it. Jim Zimbelman (Nationwide Air & Area Museum), who was not concerned within the research, agrees. “There is not a considerably massive deposit that modifications the [spectrometer] sign that comes from Medusae,” he says, which implies that different sources are unlikely to have produced as a lot mud because the MFF.


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