Presentation on theme: "Terrestrial analogues to the Martian hematite deposits with special focus on the Utah occurrences Centro de Astrobiología, Madrid, 29 September 2003 Hematite."— Presentation transcript:
Terrestrial analogues to the Martian hematite deposits with special focus on the Utah occurrences Centro de Astrobiología, Madrid, 29 September 2003 Hematite occurrences associated with hydrothermal mineralization in different geotectonic settings Jesús Martínez-Frías
Ancient Egyptians weared hematite rings on the thumb due to the position of the lower Mars mount. “Hematite helps maintain balance between body, mind, and spirit”. The Ankh is the egyptian symbol of life Hematite Ankh pendant
Martian hydrothermal/groundwater systems would provide a suitable environment either for a martian origin of life or for its continued existence. Direct precipitation from standing, oxygenated, Fe-rich water Precipitation from Fe-rich hydrothermal fluids Low-temperature dissolution and precipitation through mobile groundwater leaching Surface weathering and coatings Thermal oxidation of magnetite-rich lavas Christensen et al. (2001)
x50 Iron oxide (hematite) Terra Meridiani Iron oxide (magnetite) Nakhla meteorite Rull, F., Martínez-Frias, J. & Edwards, H.G.M. (2001) Mineralogy and Spectroscopy 4th European Conference, Paris Christensen et al. (2000) JGR 105 (E4) Fig.4 9628
Hematite Rose is a circular arrangement of bladed crystals giving the appearance of the flower of a rose. Tiger Iron is a deposit of approximately 2.2 billion years old that consists of alternating layers of silver gray hematite and red jasper, chert or even tiger eye quartz. Kidney Ore is the massive botryoidal form and gives the appearance of lumpy kidney-like masses. Oolitic Hematite is a formation that has a reddish brown color and an earthy luster and is composed of small rounded grains. Specularite is a micaceous or flaky stone that is sparkling silver gray and sometimes used as an ornamental stone. Analyses of hematite 12 Fe 2 O 3 98.2098.14 FeO1.801.29 Mn 2 O 3 0.54 MnO 0.38 100.00100.35 Analyses of hematite
Magnetite Fe 3 O 4 Hematite, Fe 2 O 3 Bixbyite, (Mn, Fe) 2 O 3 Goethite, FeO(OH) Ferrihydrite Fe 5 O 7 OH · H 2 O Limonite
Planetary Geology Laboratory Research Lines CRYOMAGMATISM METEORITIC I MPACTS CRATERS/EVENTS GEOLOGICAL MODELS (HYDROTHERMAL SYSTEMS/ SUBMARINE VENTS) IDPs/ASTEROIDAL METEORITES PRISTINE MATERIAL PLANETARY METEORITES MARS METEORITES RADIATION ATMOSPHERES CLIMATE/ICE FORMATION
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Terrestrial analogues to the Martian hematite deposits with special focus on the Utah occurrences Centro de Astrobiología, CSIC-INTA Associated to NASA Astrobiology Institute, Madrid (Spain) 29 September 2003