New Great Valley Found on Mercury

Scientists have discovered a new large valley on Mercury that may be the first evidence of buckling of the planet’s outer silicate shell in response to global contraction. The researchers discovered the valley using a new high-resolution topographic map of part of Mercury’s southern hemisphere created by stereo images from NASA’s MESSENGER spacecraft. The findings were reported in a new study published in Geophysical Research Letters, a journal of the American Geophysical Union

.Animation of a 3-D perspective view of Mercury’s great valley, as seen in an image mosaic obtained by NASA’s MESSENGER spacecraft, extending from Mercury’s Rembrandt basin. The image mosaic transforms into a colorized digital elevation model created from stereo images of the region.

Credits: NASA/JHUAPL/Carnegie Institution of Washington/DLR

The most likely explanation for Mercury’s Great Valley is buckling of the planet’s lithosphere—its crust and upper mantle—in response to global contraction, according to the study’s authors. Earth’s lithosphere is broken up into many tectonic plates, but Mercury’s lithosphere consists of just one plate. Cooling of Mercury’s interior caused the planet’s single plate to contract and bend. Where contractional forces are greatest, crustal rocks are thrust upward while an emerging valley floor sags downward.

A high-resolution digital elevation model derived from stereo images obtained by NASA’s MESSENGER spacecraft has revealed Mercury’s great valley shown here in this 3D perspective view.

Credit: NASA/Johns Hopkins University Applied Physics Laboratory/Carnegie Institution of Washington/DLR/Smithsonian Institution.

“There are examples of lithospheric buckling on Earth involving both oceanic and continental plates, but this may be the first evidence of lithospheric buckling on Mercury,” said Thomas R. Watters, senior scientist at the Center for Earth and Planetary Studies at the Smithsonian’s National Air and Space Museum in Washington, D.C., and lead author of the new study.

The valley is about 400 kilometers (250 miles) wide with its floor as much as 3 kilometers (2 miles) below the surrounding terrain. The valley is more than 1,000 kilometers (600 miles) long and extends into the Rembrandt basin, one of the largest and youngest impact basins on Mercury.

Credit: NASA/Johns Hopkins University Applied Physics Laboratory/Carnegie Institution of Washington – NASA/JPL.

The valley is bound by two large fault scarps—steps on the planet’s surface where one side of a fault has moved vertically with respect to the other. Mercury’s contraction caused the fault scarps bounding the Great Valley to become so large they essentially became cliffs. The elevation of the valley floor is far below the terrain surrounding the mountainous faults scarps, which suggests the valley floor was lowered by the same mechanism that formed the scarps themselves, according to the study authors.

 

Using colorized topography, Mercury’s “great valley” (dark blue) and Rembrandt impact basin (purple, upper right) are revealed in this high-resolution digital elevation model merged with an image mosaic obtained by NASA’s MESSENGER spacecraft.

Credits: NASA/JHUAPL/Carnegie Institution of Washington/DLR/Smithsonian Institution

“Unlike Earth’s Great Rift Valley in East Africa, Mercury’s Great Valley is not caused by the pulling apart of lithospheric plates due to plate tectonics; it is the result of the global contraction of a shrinking one-plate planet,” Watters said. “Even though you might expect lithospheric buckling on a one-plate planet that is contracting, it is still a surprise when you find that it’s formed a great valley that includes the largest fault scarp and one of the largest impact basins on Mercury.”

Contacts and sources:
Lauren Lipuma

The American Geophysical Union