Results 101 to 110 of about 39,957 (227)

Morphological, chemical and mineralogical characterization of some soils developed on hard carbonate rocks in Sardinia [PDF]

open access: yes, 1992
This preliminary note considers 19 profiles of Sardinian soils developed on hard limestone, dolomitic limestone and dolomite of different age and territorial condition, reporting on the description of the profiles and their physical, chemical and ...
Baldaccini, Paolo   +2 more
core  

Treading in Mortimer's footsteps: the geochemical cycling of iron and manganese in Esthwaite water [PDF]

open access: yes, 1984
A study of the geochemical cycling of iron and manganese in a seasonally stratified lake, Esthwaite water is described. This work is based on speculative ideas on environmental redox chemistry of iron which were proposed by C.H.
Davison, W., Tipping, E.
core  

Effects of Al substitution on goethite formation [PDF]

open access: yes, 1984
Goethites containing up to 32.7 mole % Al were synthesized and characterized through diffractometry, spectrometry, DSC and chemical techniques. Results indicate that crystal growth was favoured or hindered depending on the percentage of aluminum ...
Deiana, Salvatore Andrea   +3 more
core  

Estimating the concentration of aluminum-substituted hematite and goethite using diffuse reflectance spectrometry and rock magnetism: Feasibility and limitations

open access: yes, 2016
Hematite and goethite in soils are often aluminum(Al) substituted, which can dramatically change their and magnetic properties and bias abundance estimates using diffuse reflectance spectroscopy (DRS) and magnetic techniques. In this study, synthetic Al-
Barrón, Vidal   +6 more
core   +1 more source

Rock magnetic and geochemical evidence for authigenic magnetite formation via iron reduction in coal-bearing sediments offshore Shimokita Peninsula, Japan (IODP Site C0020) [PDF]

open access: yes, 2017
Sediments recovered at Integrated Ocean Drilling Program (IODP) Site C0020, in a fore‐arc basin offshore Shimokita Peninsula, Japan, include numerous coal beds (0.3–7 m thick) that are associated with a transition from a terrestrial to marine ...
Clyde, William C.   +6 more
core   +1 more source

Rational descriptive classification of duricrusts [PDF]

open access: yes, 1969
The term duricrust appears to be extending itself to include calcareous, gypseous, and saline crusts, in addition to crusts composed dominantly of silica and/or of sesquioxides of iron and aluminium, with or without significant contents of dioxides of ...
Dury, G.H.
core   +1 more source

Templating Iron(III) Oxides on DNA Molecules

open access: yesNanomaterials
Fe(III) oxides were prepared as free nanoparticles and on DNA templates via the precipitation of Fe(III) salts with NaOH in the presence/absence of DNA. Through control of the pH and temperature, FeOOH and Fe2O3 were synthesised.
Siyaka Mj Zubairu   +5 more
doaj   +1 more source

Goethite on Mars - A laboratory study of physically and chemically bound water in ferric oxides [PDF]

open access: yes
Thermogravimetric study of physically and chemically bound water in ferric oxides of limonite with application to goethite on ...
Khare, B. N.   +3 more
core   +1 more source

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