Researchers have figured out how tridymite formed in Mars’ Gale Crater.
due to the likelihood that it once held liquid water and, indeed, the rover found evidence that confirmed it was actually a lake as recently as 1 billion years ago.
In their search for answers, the researchers reevaluated data from every reported find of tridymite on earth. They also reviewed volcanic materials from models of Mars volcanism and reexamined sedimentary evidence from the Gale Crater lake. “It’s actually a straightforward evolution of other volcanic rocks we found in the crater,” study co-author Kirsten Siebach said in a media statement. “We argue that because we only saw this mineral once, and it was highly concentrated in a single layer, the volcano probably erupted at the same time the lake was there. Although the specific sample we analyzed was not exclusively volcanic ash, it was ash that had been weathered and sorted by water.
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