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    carbonate tagged posts

    NASA’s Perseverance Rover Deciphers Ancient History of Martian Lake

    December 14, 2023, Categories  Astronomy/Space

    This image of Jezero Crater on Mars, the landing site for NASA's Mars 2020 mission, was taken by instruments on NASA's Mars Reconnaissance Orbiter.
    This image of Mars’ Jezero Crater is overlaid with mineral data detected from orbit. The green color represents carbonates – minerals that form in watery environments with conditions that might be favorable for preserving signs of ancient life. NASA’s Perseverance is currently exploring the green area above Jezero’s fan (center).
     Credit: NASA/JPL-Caltech/MSSS/JHU-APL 

    Marking its 1,000th Martian day on the Red Planet, NASA’s Perseverance rover recently completed its exploration of the ancient river delta that holds evidence of a lake that filled Jezero Crater billions of years ago. The six-wheeled scientist has to date collected a total of 23 samples, revealing the geologic history of this region of Mars in the process.

    One sample called “Lefroy Bay” contains a large quant...

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    4-Billion yr old Nitrogen-containing Organic molecules discovered in Martian Meteorites

    May 5, 2020, Categories  Astronomy/Space, Chemistry/Nanotechnology

    20200429_AKobayashi1
    A rock fragment of Martian meteorite ALH 84001 (left). An enlarged area (right) shows the orange-coloured carbonate grains on the host orthopyroxene rock. Credit: Koike et al. (2020) Nature Communications.

    Scientists exploring Mars and analysing Martian meteorite samples have found organic compounds essential for life: nitrogen-bearing organics in a 4-billion-year-old Martian meteorite. With a new high-spatial resolution in-situ N-chemical speciation technique, they found organic materials – either synthesized locally or delivered during the Noachian – preserved intact in carbonate minerals over a long geological period. Their presence requires abiotic or biotic N-fixation and ammonia storage, suggesting early Mars had a less oxidizing environment than today.

    Because carbonate miner...

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