The relatively well-preserved ancient crust of Mars provides a natural window into early planetary evolution not available on Earth. Mars has generally been considered a one-plate basaltic planet, though recent evidence suggests magmatic evolution resulting in felsic crust might have occurred sporadically. New research shows multiple lines of evidence for diverse volcanism and complex volcanotectonics in the southern highlands of Mars within and around the 3.5 to 4-billion-year-old Eridania basin.
Contrary to Earth, present-day Mars has little to no volcanic or tectonic activity.
Further, almost half of the planet’s surface is more than 3.5 billion years old, indicating that there has been no extensive crustal recycling — a phenomenon usually powered by tectonics such as those on Earth in which surface material is recycled into the mantle — since then.
Recent discoveries suggest that this was not always the case, but Mars’ geological activity in the first billion years after its formation is still unclear.
“Geological exploration of other rocky planets provides clues to early crustal evolution and volcanotectonic processes because other bodies exemplify comparable geosystems with variable mass, gravity and composition,” said Dr. Joseph Michalski from the University of Hong Kong and his colleagues.
“Observed through the lenses of different gravity fields, bulk planet compositions and heat flow, it is possible to test models for crustal resurfacing and so discover the steps that led to plate tectonics and other forms of crustal recycling.”
“The planet Mars represents a particularly valuable puzzle piece in this regard.”
The authors studied the morphology and mineralogy of the Eridania region in the southern hemisphere of Mars.
They analyzed remote sensing data from various orbiters, including NASA’s Mars Global Surveyor, Mars Odyssey, and Mars Reconnaissance Orbiter.
The Eridania region offers the strongest crustal remnants of Mars’…
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