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Global mapping of Martian hematite mineral deposits : Remnants of water-driven processes on early Mars
| Content Provider | Semantic Scholar |
|---|---|
| Copyright Year | 2001 |
| Abstract | Near-global (60 S to 60 N) thermal infrared mapping by the Thermal Emission Spectrometer (TES) on Mars Global Surveyor has revealed unique deposits of crystalline gray hematite ( -Fe2O3) exposed at the Martian surface in Sinus Meridiani, Aram Chaos, and in numerous scattered locations throughout Valles Marineris. The Sinus Meridiani material is an in-place, rock stratigraphic sedimentary unit characterized by smooth, friable layers composed primarily of basaltic sediments with 10–15% crystalline gray hematite. This unit has outliers to the north that appear to have formed by stripping and removal. The hematite within Aram Chaos occurs in a sedimentary layer within a closed basin that was likely formed during the basin infilling and predates the formation of nearby chaos and outflow terrains. This unit appears to be exposed by erosion and may be more extensive beneath the surface. The Valles Marineris occurrences are closely associated with the interior layered deposits and may be in place within the layers or eroded sediments. Overall, crystalline gray hematite is extremely uncommon at the surface, yet in all observed locations it is closely associated with layered, sedimentary units. Here we argue that these hematite deposits have formed by a process involving chemical precipitation from aqueous fluids, under either ambient or hydrothermal conditions. Thus the TES mineralogic data provide evidence that liquid water has been stable at or near the surface, probably for millions of years by analogy with terrestrial iron formations, in specific locations on early Mars. |
| File Format | PDF HTM / HTML |
| Alternate Webpage(s) | http://www.mars.asu.edu/christensen/docs/christensen_hematite2_jgr.pdf |
| Language | English |
| Access Restriction | Open |
| Subject Keyword | Abstraction layer Advanced Spaceborne Thermal Emission and Reflection Radiometer Chemical Precipitation Cytochrome P-450 CYP1A1 Erosion (morphology) In-place algorithm Liquid substance N-tris(hydroxymethyl)methyl-2-aminomethane sulfonate Nasal sinus Polyhedral terrain Spectrometers Symptom duration during occurrences or episodes:Time:Point in time:^Patient:Quantitative Terrestrial television Tomography, Emission-Computed Trigonometric tables anatomical layer hematite |
| Content Type | Text |
| Resource Type | Article |
