More Like this

1. The fate of primary iron sulfides in the CM1 carbonaceous chondrites: Effects of advanced aqueous alteration on primary components

   https://doi.org/10.1111/maps.14132  

   Singerling, S. A.; Corrigan, C. M.; Brearley, A. J. (January 2024, Meteoritics & Planetary Science)

   Abstract We have carried out a SEM‐EPMA‐TEM study to determine the textures and compositions of relict primary iron sulfides and their alteration products in a suite of moderately to heavily altered CM1 carbonaceous chondrites. We observed four textural groups of altered primary iron sulfides: (1) pentlandite+phyllosilicate (2P) grains, characterized by pentlandite with submicron lenses of phyllosilicates; (2) pyrrhotite+pentlandite+magnetite (PPM) grains, characterized by pyrrhotite–pentlandite exsolution textures with magnetite veining and secondary pentlandite; (3) pentlandite+serpentine (PS) grains, characterized by relict pentlandite exsolution, serpentine, and secondary pentlandite; and (4) pyrrhotite+pentlandite+magnetite+serpentine (PPMS) grains, characterized by features of both the PPM and PS grains. We have determined that all four groups were initially primary iron sulfides, which formed from crystallization of immiscible sulfide melts within silicate chondrules in the solar nebula. The fact that such different alteration products could result from the same precursor sulfides within even the same meteorite sample further underscores the complexity of the aqueous alteration environment for the CM chondrites. The different alteration reactions for each textural group place constraints on the mechanisms and conditions of alteration with evidence for acidic environments, oxidizing environments, and changing fluid compositions (Ni‐bearing and Si‐Mg‐bearing). 

   more » « less
2. Characterization of aqueous alteration and formation of salty exposures at Ius Chasma, Mars (NOTE: First author Wilk was a SETI Institute REU 2020 student)

   https://doi.org/10.1016/j.icarus.2023.115800  

   Wilk, Kierra A.; Bishop, Janice L.; Weitz, Catherine M.; Parente, Mario; Saranathan, Arun M.; Itoh, Yuki; Gross, Christoph; Flahaut, Jessica; Seelos, Frank (January 2024, Icarus)
3. Resolution and alteration with ample exceptional divisor

   https://doi.org/10.1007/s11425-023-2249-3  

   Kollár, János; Witaszek, Jakub (January 2024, Science China Mathematics)
4. Overwriting of sedimentary magnetism by bacterially mediated mineral alteration

   https://doi.org/10.1130/g39706.1  

   Ebert, Yael; Shaar, Ron; Emmanuel, Simon; Nowaczyk, Norbert; Stein, Mordechai (February 2018, Geology)
5. Shocked titanite records Chicxulub hydrothermal alteration and impact age

   https://doi.org/10.1016/j.gca.2020.04.031  

   Timms, Nicholas E.; Kirkland, Christopher L.; Cavosie, Aaron J.; Rae, Auriol S.P.; Rickard, William D.A.; Evans, Noreen J.; Erickson, Timmons M.; Wittmann, Axel; Ferrière, Ludovic; Collins, Gareth S.; et al (July 2020, Geochimica et Cosmochimica Acta)