Phyllosilicate Diversity and Past Aqueous Activity Revealed at Mawrth Vallis, Mars

  title={Phyllosilicate Diversity and Past Aqueous Activity Revealed at Mawrth Vallis, Mars},
  author={J. Bishop and E. Dobrea and N. K. McKeown and M. Parente and B. Ehlmann and J. Michalski and R. Milliken and F. Poulet and G. Swayze and J. Mustard and S. Murchie and J. Bibring},
  pages={830 - 833}
Observations by the Mars Reconnaissance Orbiter/Compact Reconnaissance Imaging Spectrometer for Mars in the Mawrth Vallis region show several phyllosilicate species, indicating a wide range of past aqueous activity. Iron/magnesium (Fe/Mg)–smectite is observed in light-toned outcrops that probably formed via aqueous alteration of basalt of the ancient cratered terrain. This unit is overlain by rocks rich in hydrated silica, montmorillonite, and kaolinite that may have formed via subsequent… Expand
Phyllosilicate and hydrated silica detections in the knobby terrains of Acidalia Planitia, northern plains, Mars
Here we report detections of Fe/Mg phyllosilicates and hydrated silica in discrete stratigraphic units within the knobby terrains of Acidalia Planitia made using data acquired by CompactExpand
Phyllosilicates and sulfates at Endeavour Crater, Meridiani Planum, Mars
[1] Phyllosilicates have been identified on the Martian surface from orbit, and are hypothesized to have formed under wet, non-acidic conditions early in the planet's history. Exposures of theseExpand
What the ancient phyllosilicates at Mawrth Vallis can tell us about possible habitability on early Mars
Abstract Phyllosilicate deposits on Mars provide an opportunity to evaluate aqueous activity and the possibility that habitable environments may have existed during the Noachian period there.Expand
Mineralogical characterization of acid weathered phyllosilicates with implications for secondary martian deposits
Abstract The detection of phyllosilicates and sulfates on Mars has revealed a complex aqueous history which suggests distinct geochemical environments separated temporally and spatially. RecentExpand
Characterization of phyllosilicates observed in the central Mawrth Vallis region, Mars, their potential formational processes, and implications for past climate
Mawrth Vallis contains one of the largest exposures of phyllosilicates on Mars. Nontronite, montmorillonite, kaolinite, and hydrated silica have been identified throughout the region using data fromExpand
Evidence for a changing Martian climate from the mineralogy at Mawrth Vallis
Abstract Layered outcrops in the Mawrth Vallis region of Mars contain the greatest diversity of aqueous alteration products on the planet, and these materials are used to infer past aqueousExpand
Authigenic phyllosilicates in modern acid saline lake sediments and implications for Mars
[1] Aluminum- and Fe/Mg-phyllosilicates are considered important geochemical indicators in terrestrial and Martian sedimentary systems. Traditionally, Al-phyllosilicates are characterized as formingExpand
The Italian Solfatara as an analog for Mars fumarolic alteration
Abstract The first definitive evidence for continental vents on Mars is the in situ detection of amorphous silicarich outcrops by the Mars Exploration Rover Spirit. These outcrops have beenExpand
Characterization of hydrated silicate-bearing outcrops in Tyrrhena Terra, Mars: Implications to the alteration history of Mars
Abstract The Tyrrhena Terra region of Mars is studied with the imaging spectrometers OMEGA (Observatoire pour la Mineralogie, l’Eau, les Glaces et l’Activite) onboard Mars Express and CRISM (CompactExpand
Evidence for Low-Grade Metamorphism, Hydrothermal Alteration, and Diagenesis on Mars from Phyllosilicate Mineral Assemblages
The enhanced spatial and spectral resolution provided by the Compact Reconnaissance Imaging Spectrometer for Mars (CRISM) on the Mars Reconnaissance Orbiter (MRO) has led to the discovery of numerousExpand


Hydrated silicate minerals on Mars observed by the Mars Reconnaissance Orbiter CRISM instrument
The diversity of phyllosilicate mineralogy is expanded with the identification of kaolinite, chlorite and illite or muscovite, and a new class of hydrated silicate (hydrated silica). Expand
Phyllosilicates in the Mawrth Vallis region of Mars
[1] OMEGA/Mars Express has discovered large outcrops rich in phyllosilicates in the region of Mawrth Vallis, Mars (around 20°W, 25°N). The region is located in Noachian highly cratered terrains,Expand
Incipient hydrothermal alteration of basalts and the origin of martian soil
The martian soil is a fine-grained regolith that is chemically basaltic in character with evidence for both gains and losses of volatile and mobile elements compared to martian basalt compositions.Expand
Evidence for a sedimentary origin of clay minerals in the Mawrth Vallis region, Mars
Clay minerals detected spectroscopically in the Mawrth Vallis region of Mars correspond to a complex, layered, thick (>600 m) stratigraphic section of ancient bedrock. Because the light-toned,Expand
Characterization of alteration products in tephra from Haleakala, Maui: A visible-infrared spectroscopy, Mössbauer spectroscopy, XRD, EMPA and TEM study
Altered basaltic tephra from Haleakala, Maui, are characterized using multiple techniques in order to identify the minerals formed under a variety of conditions and to understand the soil formationExpand
Phyllosilicates on Mars and implications for early martian climate
It is inferred that the two main families of hydrated alteration products detected—phyllosilicates and sulphates—result from different formation processes, which occurred during two distinct climatic episodes: an early Noachian Mars, resulting in the formation of Hydrated silicates, followed by a more acidic environment, in which sulphates formed. Expand
Compositional stratigraphy of clay‐bearing layered deposits at Mawrth Vallis, Mars
Phyllosilicates have previously been detected in layered outcrops in and around the Martian outflow channel Mawrth Vallis. CRISM spectra of these outcrops exhibit features diagnostic of kaolinite,Expand
Mars Surface Diversity as Revealed by the OMEGA/Mars Express Observations
The OMEGA investigation, on board the European Space Agency Mars Express mission, has identified and mapped mafic iron-bearing silicates of both the northern and southern crust, localized concentrations of hydrated phyllosilicates and sulfates but no carbonates, and ices and frosts with a water-ice composition of the north polar perennial cap. Expand
Effects of Iron Oxidation State on the Texture and Structural Order of Na-Nontronite Gels
Aqueous gels of unaltered (oxidized) and chemically reduced ferruginous smectite (SWa-1 from the Source Clays Repository of The Clay Minerals Society) were characterized by transmission electronExpand
A Global View of Martian Surface Compositions from MGS-TES
Thermal Emission Spectrometer (TES) data from the Mars Global Surveyor (MGS) are used to determine compositions and distributions of martian low-albedo regions. Two surface spectral signatures areExpand