Assessment of feldspar solubility constants in water in the range of 0 degrees to 350 degrees C at vapor saturation pressures

Clicks: 2
ID: 293950
1999
Free PDF
Article Quality & Performance Metrics
Overall Quality
Not rated
Combines reader engagement with the AI quality analysis. This article has not been analysed, so there is no overall score — reader engagement is measured and shown alongside.
AI Quality Assessment
Not analyzed
Readership in this journal
Emerging

Ranked #3,210 of 8,486 articles by views in american journal of science

Most read Least read

Bar heights use a square-root scale. Only the 120 most-read articles are drawn; the journal has 8,486 in total.

Mint this article as an NFT
Not yet minted

Create a permanent, verifiable on-chain record of this article on the Scimatic Network. The NFT is held in your Journament account, and you can withdraw it to your own wallet at any time.

5 SUSD one-off · no wallet required
Sign in to mint
Abstract
The equilibrium constants for endmember feldspar hydrolysis for the following reactions NaAlSi 3 O 8 ؉ 8H 2 O ‫؍‬ Na ؉ ؉ Al(OH) 4 ؊ ؉ 3H 4 SiO 4 0 KAlSi 3 O 8 ؉ 8H 2 O ‫؍‬ K ؉ ؉ Al(OH) 4 ؊ ؉ 3H 4 SiO 4 0 CaAl 2 Si 2 O 8 ؉ 8H 2 O ‫؍‬ Ca ؉2 ؉ 2Al(OH) 4 ؊ ؉ 2H 4 SiO 4 0 are accurately described by log K low-albite ؊96.267؉305,542/T 2 ؊3985.50/T؊28.588• 10 ؊6 • T 2 ؉35.790 • log T log K high-albite ؊97.275؉306,065/T 2 ؊3313.51/T؊28.622• 10 ؊6 • T 2 ؉35.851 • log T log K microcline ؊78.594؉311,970/T 2 ؊6068.38/T؊27.776• 10 ؊6 • T 2 ؉30.308 • log T log K sanidine ؊77.837؉316,431/T 2 ؊5719.10/T؊27.712• 10 ؊6 • T 2 ؉29.738 • log T log K anorthite ؊88.591؉326,546/T 2 ؊2720.61/T؊40.100• 10 ؊6 • T 2 ؉31.168 • log Twhere T is in K.They are valid in the range 0°to 350°C, at 1 bar below 100°C and at vapor saturation pressures (P sat ) at higher temperatures.The equations for low-albite and microcline are valid for Amelia albite and for microcline with the same degree of Al-Si order (Z ‫؍‬ 0.95), respectively.The same kind of log Ktemperature equations have also been retrieved for alkali-feldspar and plagioclase solid solutions (tables 4 and 6).The calculated feldspar equilibrium constants of this study indicate much higher solubility under weathering conditions than generally accepted to date, the difference being more than one and a half orders of magnitude at 0°C for both high-and low-albite, but somewhat less for microcline, sanidine, and anorthite.This higher solubility is largely a consequence of new data for the thermodynamic properties of H 4 SiO 4 0 .The present results have a particularly important bearing on the stability of feldspars under weathering conditions and the study of interaction between water and rock/soil in this environment.They are, however, also important for the study of equilibrium/dis-equilibrium conditions in active geothermal systems.
Reference Key
openalex_W2281641682 Use this key to autocite in the manuscript while using SciMatic Manuscript Manager or Thesis Manager
Authors Stefán Arnórsson
Journal american journal of science
Year 1999
DOI
10.2475/ajs.299.3.173
URL
https://ajs.scholasticahq.com/article/60808.pdf
Keywords Keywords not found

Citations

No citations found. To add a citation, contact the admin at info@scimatic.org

Comments

No comments yet. Be the first to comment on this article.