Salar de Pajonales: A High-Altitude Salt Flat in Chile Serving as a Mars Analogue
Scientists are studying the Salar de Pajonales in Chile's Atacama Desert as a 'near-perfect analogue' for conditions on Mars. Located 3.5 km above sea level, it is extremely dry, freezing, and exposed to high ultraviolet radiation. Researchers found that microbes survive there by hiding beneath the surface of gypsum rocks. Gypsum is translucent, allowing sunlight for photosynthesis while blocking harmful radiation and trapping moisture. The discovery of fossils and chemical fingerprints of ancient life within these structures suggests that similar gypsum deposits on Mars could potentially harbor secrets of past Martian life, guiding future space exploration missions.
Key Points
- The Salar de Pajonales in the Atacama Desert mimics Martian conditions due to its extreme dryness and high UV radiation.
- Microbes in this environment inhabit layered rock structures called stromatolites made of gypsum (CaSO4.2H2O).
- Gypsum acts as a protective shield, filtering UV rays while allowing enough light for microbial survival.
- The study suggests that orbiters and satellites should target gypsum deposits on Mars to search for signs of ancient life.
- Fossils found deep within the Salar's stromatolites demonstrate how minerals can preserve biological signatures over long periods.
Exam Facts
- Salar de Pajonales is located in the Atacama Desert, Chile.
- Gypsum's chemical formula is CaSO4.2H2O.
- Stromatolites are layered sedimentary formations created by the activity of microorganisms.
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