Rate control in dissolution of alkali feldspars--I. Study of residual feldspar grains by X-ray photoelectron spectroscopy

Details Rate control in dissolution of alkali feldspars--I. Study of residual feldspar grains by X-ray photoelectron spectroscopy Rate control in dissolution of alkali feldspars--I. Study of residual feldspar grains by X-ray photoelectron spectroscopy

May 1976

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1976gecoa..40..537p&link_type=abstract

Geochimica et Cosmochimica Acta, vol. 40, Issue 5, pp.537-548

Computer Science

11

Scientific paper

Sanidine grains (100-600 m in diameter) were subjected to dissolution at 82°C in aqueous electrolyte solutions of pH ranging from 4 to 8 for 293 or 377 hr. Dissolution equivalent to the removal of silica from the outer 300-900 A of these grains was accomplished. The shallow subsurfaces of feldspar grains were then analyzed for K, Al, and Si by X-ray photoelectron spectroscopy. The results rule out any continuous precipitate layer; if an alkali-depleted subsurface zone (leached layer) was present in the feldspar, the thickness of such a zone approximated by linear increase of alkali concentration with depth was not more than about 17 Å. It is concluded that in the absence of a compact precipitate layer, dissolution of feldspars in the temperature range corresponding to deep diagenesis is controlled by the processes at the feldspar-solution interface and a leached layer more than one feldspar unit cell thick does not form. Whether the same applies at the temperatures of shallow diagenesis and weathering cannot be judged with certainty, but parallels with leached layers on alkali silicate glasses suggest that it does.

Affiliated with

Also associated with

No associations

Rating

Rate control in dissolution of alkali feldspars--I. Study of residual feldspar grains by X-ray photoelectron spectroscopy does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.

If you have personal experience with Rate control in dissolution of alkali feldspars--I. Study of residual feldspar grains by X-ray photoelectron spectroscopy, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Rate control in dissolution of alkali feldspars--I. Study of residual feldspar grains by X-ray photoelectron spectroscopy will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-1796099