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Feldspars sanidine

As Sr is highly compatible in alkali feldspar under all conditions, it is likely that so too is Pb, whatever the validity of the Sr-Pb proxy relationship. Leeman (1979) determines Z)pb of 0.84-1.37 for separated sanidine phenocrysts (Or- so) from various acid volcanic rocks, in broad agreement with Equation (37). [Pg.108]

Leeman WP (1979) Partitioning of Pb between volcanic glass and coexisting sanidine and plagioclase feldspars. Geochim Cosmochim Acta 43 171-175... [Pg.122]

Table 5.62 Chemical analyses of some natural feldspars (Deer et al., 1983). (1) orthoclase (Mogok, Burma) (2) Adularia (St. Gottard, Switzerland) (3) anorthoclase inclusion in augite (Euganean Hills NE Italy) (4) sanidine from a nepheline-leucitite (5) albite from a pegmatite (6) anorthite from a calc-silicatic rock. ... Table 5.62 Chemical analyses of some natural feldspars (Deer et al., 1983). (1) orthoclase (Mogok, Burma) (2) Adularia (St. Gottard, Switzerland) (3) anorthoclase inclusion in augite (Euganean Hills NE Italy) (4) sanidine from a nepheline-leucitite (5) albite from a pegmatite (6) anorthite from a calc-silicatic rock. ...
Table 10.2 Upper concentration limits for Henry s law behavior in silicates and oxides. Abbreviations Ab = albite Sa = sanidine PI = plagioclase Pel = alkaline feldspar Rb-fel = Rb-feldspar Ne = nepheline Mu = muscovite 01 = olivine Di = diopside Cpx = clinopyroxene Oxp = orthyporoxene Amph = amphibole Par = pargasite Gr = garnet Ilm = ilmenite ... Table 10.2 Upper concentration limits for Henry s law behavior in silicates and oxides. Abbreviations Ab = albite Sa = sanidine PI = plagioclase Pel = alkaline feldspar Rb-fel = Rb-feldspar Ne = nepheline Mu = muscovite 01 = olivine Di = diopside Cpx = clinopyroxene Oxp = orthyporoxene Amph = amphibole Par = pargasite Gr = garnet Ilm = ilmenite ...
Blasi A., Brajkovic A., and De Pol Blasi (1983). Dry-heating conversions of low microcline to high sanidine via a one-step disordering process. Abstr. NATO Advanced Study Inst, on Feldspars and Feldspatoids, Rennes, France. [Pg.820]

Haselton H. T, Hovis G. L., Hemingway B. S., and Robie R. A. (1983). Calorimetric investigation of the excess entropy of mixing in analbite-sanidine solid solutions Lack of evidence for Na, K short range order and implications for two feldspar thermometry. Amer. Mineral, 68 398-413. [Pg.834]

Merkel G. A. and Blencoe J. G. (1982). Thermodynamic procedures for treating the mono-clinic/triclinic inversions as a high-order phase transition in equations of state for binary analbite-sanidine feldspars. In Advances in Physical Geochemistry, vol. 2, S. K. Saxena (series ed.). New York Springer-Verlag. [Pg.844]

Cherniak D.J. (1996) Strontium diffusion in sanidine and albite, and general comments on strontium diffusion in alkali feldspars. Geochim. Cosmochim. Acta 60, 5037-5043. [Pg.597]

FIGURE 3.3 X-ray diffractograms of the B-I.b. bentonite sample (sedimentary) (upper) and B-II.b. upper bentonite sample (bentonitized tuff) (lower), mm = montmorillonite, ab = albite (plagioclase), q = quartz, i = illite, s = sanidine (feldspar). (Reprinted from Nagy and Konya 2005, with permission from Elsevier.)... [Pg.173]

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See also in sourсe #XX -- [ Pg.226 ]



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Feldspars

Sanidine

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