Results 91 to 100 of about 4,092 (217)

Feldspar crystallisation in felsic magmas: a review

, 1992
Understanding the controls on the evolution of natural feldspars is greatly assisted by coupling experimental determinations of feldspar/melt equilibria with thermodynamic modelling and the calculation of crystallisation paths.
Hanna Nekvasil
core   +1 more source

Evolution of chemically induced cracks in alkali feldspar: thermodynamic analysis. [PDF]

Phys Chem Miner, 2022
Abart R, Petrishcheva E, Habler G, Sutter C, Fischer FD, Predan J, Kegl M, Rammerstorfer FG.   +7 more
europepmc   +1 more source

(Table 4) Composition of major oxides of alkali feldspar crystals in tephra layers at ODP Site 121-758

, 1991
(Table 4) Composition of major oxides of alkali feldspar crystals in tephra layers at ODP Site 121 ...
Farrell, John W, Dehn, Jonathan, Schmincke, Hans-Ulrich, Jonathan Dehn (6981269), John W Farrell (6968075), Hans-Ulrich Schmincke (6959507)   +5 more
core   +1 more source

Diffusion vs. fluid alteration in alkali feldspar ⁴⁰Ar/³⁹Ar thermochronology: does cross-correlation of log(r/r₀) and age spectra validate thermal histories?

, 2020
For six decades geoscientists have been trying to quantitatively understand the nature of radiogenic Ar loss from alkali feldspar. Some researchers suggest that volume diffusion is the dominant mechanism, and they use conventional step-heating ⁴⁰Ar/³⁹Ar ...
Spikings, Richard Alan, Popov, Daniil
core   +1 more source

Petrogenesis and age of skarns associated with felsic and metamafic dykes from the Paraíba do Sul Complex, southern Espírito Santo State

Brazilian Journal of Geology
: This paper concerns the study of petrography, mineral chemistry and geochronology of skarns generated at the contact of marbles of the Paraíba do Sul Complex with felsic and metamafic dykes in the southern Espírito Santo State.
Raissa Beloti de Mesquita, Hanna Jordt-Evangelista, Gláucia Nascimento Queiroga, Edgar Batista de Medeiros Júnior, Ivo Antônio Dussin   +4 more
doaj   +1 more source

Microstructure and Dielectric Properties of Ceramic Bodies Containing Um Risha Syenite Doped with Coflux Oxides [PDF]

Delta Journal of Science
          This paper reported the effect of the addition of Um Risha quartz alkali feldspar syenite from Egypt, which containing a high amount of Fe2O3 and alkaline oxides mainly K2O and Na2O used as a flux material, on the densification properties ...
Basant Salim, Osama Hemeda, Mobarak Aly, Mohamed Abo Anbar, Doaa Abdel Aziz, Ibrahim Salem, Salah Abead   +6 more
doaj   +1 more source

Oxygen isotope fractionation study of quartz - alkali feldspar pairs

, 1973
Oxygen isotope exchange experiments with quartz, alkali feldspar, and various aqueous solutions have been performed at 600°C at a water pressure of 2 kilobars.
Hutchison, Murray Noel
core  

Egyptian feldspar for multidimensional performance boosts in alkali-activated slag concrete

Journal of Engineering and Applied Science
The environmental impact of conventional concrete underscores the urgent need for sustainable alternatives. Alkali-activated slag (AAS) concrete offers a lower-carbon solution, Yet its performance remains open to optimization.
Alaa M. Rashad, Youssef A. Mosleh, Ghada M. F. Essa   +2 more
doaj   +1 more source

Investigation of the hydrothermally altered K-feldspar use in slag-based alkali-activated binders

Case Studies in Construction Materials
Alkali-activated materials (AAMs) are considered a low-carbon binder and a promising alternative to Portland cement, with both performance and environmental benefits.
Ivo C. Carvalho, Bruna Rosa, Caroline Krauczuk, Maria E. Dembogurski, Gabrielli T. de Oliveira, Ana P. Kirchheim   +5 more
doaj   +1 more source

The Cananeia Alkaline Body in the South Coast of São Paulo State: Mineral Chemistry [PDF]

Geologia USP. Série Científica, 2009
The Cananeia alkaline occurrence of Late Cretaceous age (Ar-Ar, 83.6 Ma) lies in the Ribeira Valley and it is representedby two small bodies: Morro de São João (1.8 km2) in Cananeia Island, and Morrete (0.4 km2), in the neighboringComprida Island.
Celso de Barros Gomes, Fernando Pelegrini Spinelli   +1 more
doaj