Browsing by Subject "Mars"
Now showing items 1-8 of 8
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Brine Driven Alteration of Phyllosilicates
(2024-04-16)The sedimentary structures and mineralogy of the Martian surface record a complex and inconsistently active hydrosphere throughout the planet’s history (Bibring et al., 2006; Elwood Madden et al., 2009). Phyllosilicates ... -
Characterizing Ferrihydrite Transformation Products in Near-Saturated Brine Environments
(2023-05)Ferrihydrite transformation pathways are critical in understanding iron cycling and mineral transformation processes in extraterrestrial systems such as those observed on Mars. While common throughout terrestrial near-surface ... -
Cyanobacterial weathering in warming periglacial sediments: implications for nutrient cycling and potential biosignatures
(2021-11)The cryosphere hosts a widespread microbial community, yet microbial influences on silicate weathering have been historically neglected in cold-arid deserts. Here we investigate bioweathering by a cold-tolerant cyanobacteria ... -
Effects of pH on the Raman Spectra of Brines
(2022-05-14)The use of Raman spectroscopy on Mars can help us understand the geochemistry of past or present brines on Mars which could help us assess the overall habitability of Mars. Raman can detect biosignatures from organic matter, ... -
Experimental production of dust by replicating aeolian and glacial abrasion
(2023-05-12)Dust is a highly mobile and influential class of sediment. Dust influences the climate, biosphere, and soils, and holds information about Earth’s paleoclimate when preserved in the rock record. In this work we define dust ... -
Observations of Mars analogous basalt in near saturated brines
(2020-05)The Mars 2020 rover and the ExoMars rover will include a Raman spectrometer as part of the suite of instruments onboard the rovers and will be the first times a Raman spectrometer will take direct measurements on the surface ... -
Raman Spectroscopy of High 1 Salinity Brines and Ices
(2022-01-01)Raman spectroscopy is an ideal tool to analyze the geochemistry and mineralogy of heterogenous mixtures of solids, liquid, and gases in situ, while maintaining planetary protection protocols. Here we characterize saturated ... -
Siderite Dissolution in Mars-analog Brines: Kinetics and Reaction Products
(2021-08-24)This study examines siderite (FeCO3) reactivity in MgCl2 and MgSO4 brines with varying salt concentrations (0.01M, 1M, and 3M) at both acidic (pH ∼ 2 and pH ≤ 2) and near-neutral (pH ∼ 7) conditions. We measured aqueous ...