title: Mineralogy of a mudstone at Yellowknife Bay, Gale crater, Mars.
abstract: Sedimentary rocks at Yellowknife Bay (Gale crater) on Mars include mudstone sampled by the Curiosity rover. The samples, John Klein and Cumberland, contain detrital basaltic minerals, calcium sulfates, iron oxide or hydroxides, iron sulfides, amorphous material, and trioctahedral smectites. The John Klein smectite has basal spacing of ~10 angstroms, indicating little interlayer hydration. The Cumberland smectite has basal spacing at both ~13.2 and ~10 angstroms. The larger spacing suggests a partially chloritized interlayer or interlayer magnesium or calcium facilitating H2O retention. Basaltic minerals in the mudstone are similar to those in nearby eolian deposits. However, the mudstone has far less Fe-forsterite, possibly lost with formation of smectite plus magnetite. Late Noachian/Early Hesperian or younger age indicates that clay mineral formation on Mars extended beyond Noachian time.
authors: Planetary Science Institute, Tucson, AZ 85719, USA.
authors: D T
authors: DT
authors: Vaniman
authors: D L
authors: DL
authors: Bish
authors: D W
authors: DW
authors: Ming
authors: T F
authors: TF
authors: Bristow
authors: R V
authors: RV
authors: Morris
authors: D F
authors: DF
authors: Blake
authors: S J
authors: SJ
authors: Chipera
authors: S M
authors: SM
authors: Morrison
authors: A H
authors: AH
authors: Treiman
authors: E B
authors: EB
authors: Rampe
authors: M
authors: M
authors: Rice
authors: C N
authors: CN
authors: Achilles
authors: J P
authors: JP
authors: Grotzinger
authors: S M
authors: SM
authors: McLennan
authors: J
authors: J
authors: Williams
authors: J F
authors: JF
authors: Bell
authors: H E
authors: HE
authors: Newsom
authors: R T
authors: RT
authors: Downs
authors: S
authors: S
authors: Maurice
authors: P
authors: P
authors: Sarrazin
authors: A S
authors: AS
authors: Yen
authors: J M
authors: JM
authors: Morookian
authors: J D
authors: JD
authors: Farmer
authors: K
authors: K
authors: Stack
authors: R E
authors: RE
authors: Milliken
authors: B L
authors: BL
authors: Ehlmann
authors: D Y
authors: DY
authors: Sumner
authors: G
authors: G
authors: Berger
authors: J A
authors: JA
authors: Crisp
authors: J A
authors: JA
authors: Hurowitz
authors: R
authors: R
authors: Anderson
authors: D J
authors: DJ
authors: Des Marais
authors: E M
authors: EM
authors: Stolper
authors: K S
authors: KS
authors: Edgett
authors: S
authors: S
authors: Gupta
authors: N
authors: N
authors: Spanovich
mesh_terms: D005118:Extraterrestrial Environment / Q000737:chemistry*; D052203:Ferrosoferric Oxide / Q000032:analysis / Q000737:chemistry; D019015:Geologic Sediments / Q000032:analysis / Q000737:chemistry*; D018535:Mars; D008903:Minerals / Q000032:analysis / Q000737:chemistry*; D017640:Silicates / Q000032:analysis / Q000737:chemistry; D017655:Silicon Compounds / Q000032:analysis / Q000737:chemistry
chemical_list: D008903:Minerals; D017640:Silicates; D017655:Silicon Compounds; C060346:basalt; C503823:forsterite; C033214:Smectite; D052203:Ferrosoferric Oxide