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 , June 20 (Xinhua) --
Scientists have found diverse minerals on Mars, suggesting that conditions
changed on the planet over time.


This was unveiled after scientists examining initial samples collected by
NASA's Curiosity rover from rocks in the lowermost layers of a Martian mountain
dabbed Mount Sharp.


Curiosity landed near Mount Sharp in the Gale Crater in August 2012 and
reached the base of the mountain in 2014. It began to drive toward uphill
destinations on Mount Sharp since its second two-year mission extension
commenced on Oct. 1, 2016.


In a paper published recently in Earth and Planetary Science Letters,
scientists from the Astromaterials Research and Exploration Science (ARES)
Division at NASA's Johnson Space Center reported the first four samples
collected from the lower layers of Mount Sharp.


"We went to Gale Crater to investigate these lower layers of Mount Sharp that
have these minerals that precipitated from water and suggest different
environments Women's
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Elizabeth Rampe, lead author of the new study and a NASA exploration mission
scientist at Johnson Space Center, said in a press statement.


"These layers were deposited about 3.5 billion years ago, coinciding with a
time on Earth when life was beginning to take hold. We think early Mars may have
been similar to early Earth Women's
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 , and so these
environments might have been habitable," Rampe said.


The team said that the minerals found in the four samples drilled near the
base of Mount Sharp suggest several different environments were present in
ancient Gale Crater. There is evidence for waters with different pH levels and
other varying conditions.


Studying such rock layers can yield information about Mars' past
habitability, and determining minerals found in the layers of sedimentary rock
yields much data about the environment in which they formed.


According to the U.S. space agency, at the base are minerals from a primitive
magma source; they are rich in iron and magnesium Men's
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 , similar to basalts in Hawaii. Moving
higher in the section, scientists saw more silica-rich minerals. In the
"Telegraph Peak" sample, scientists found minerals similar to quartz.


In the "Buckskin" sample, scientists even found a mineral called
tridymite Women's
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 , which was somewhat
perplexing. Tridymite is found on Earth in rocks that formed from partial
melting of Earth's crust or in the continental crust -- a strange finding
because Mars never had plate tectonics.


That's not all. Scientists found clay minerals in the "Confidence Hills" and
"Mojave

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