Aqueous alteration processes in Jezero crater, Mars—implications for organic geochemistry

• The Perseverance rover landed in Jezero crater, Mars, in February 2021. We used the Scanning Habitable Environments with Raman and Luminescence for Organics and Chemicals (SHERLOC) instrument to perform deep-ultraviolet Raman and fluorescence spectroscopy of three rocks within the crater. We identify evidence for two distinct ancient aqueous environments at different times. Reactions with liquid water formed carbonates in an olivine-rich igneous rock. A sulfate-perchlorate mixture is present in the rocks, which probably formed by later modifications of the rocks by brine. Fluorescence signatures consistent with aromatic organic compounds occur throughout these rocks and are preserved in minerals related to both aqueous environments. 

Ämnesord

NATURVETENSKAP  -- Geovetenskap och miljövetenskap -- Geologi (hsv//swe)

NATURAL SCIENCES  -- Earth and Related Environmental Sciences -- Geology (hsv//eng)

Nyckelord

aromatic compound

carbonic acid

carbonic acid derivative

iron

magnesium

mineral

perchlorate

phosphate

sulfate

water

crater

fluorescence spectroscopy

igneous rock

instrumentation

Mars

organic geochemistry

Raman spectroscopy

aqueous solution

Article

astronomy

chemical composition

chemical modification

chemical reaction

concentration (parameter)

evidence based practice

fluorescence analysis

geochemistry

high temperature

hydration

low temperature

oxidation

precipitation

Raman spectrometry

rock

synthesis

Publikations- och innehållstyp

ref (ämneskategori)

art (ämneskategori)