Appraisal of the Ferguson method and the linear model using Δ(bc), Δ(b*c*), Δ(αγ), Δ(α*γ*) to estimate tetrahedral Al-contents in alkali feldspar
| Autor: | Achille Blasi |
|---|---|
| Rok vydání: | 1982 |
| Předmět: |
010504 meteorology & atmospheric sciences
Chemistry Analytical chemistry Linear model Mineralogy 010502 geochemistry & geophysics Alkali metal Feldspar 01 natural sciences Lattice constant Geochemistry and Petrology visual_art Tetrahedron visual_art.visual_art_medium Alkali feldspar 0105 earth and related environmental sciences |
| Zdroj: | Mineralogical Magazine. 46:465-468 |
| ISSN: | 1471-8022 0026-461X |
| DOI: | 10.1180/minmag.1982.046.341.10 |
| Popis: | The new method proposed by Ferguson (1980, 1981) for estimating the T-site occupancies in K-rich feldspars from lattice constants is discussed and compared with the linear model using the structural indicators Δ(bc), Δ(b*c*), Δ(αγ), Δ(α*γ*). The latter method appears to be considerably more effective in view of its wider application to alkali feldspars of different compositions and structural states. Ferguson's (1980, 1981) method has been conceived for K-rich feldspars alone and may produce results that tend to be more erroneous the further a K-rich feldspar lies from the two-step ordering paths involved in the formulation of the determinative procedure itself. |
| Databáze: | OpenAIRE |
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