Hostname: page-component-7479d7b7d-k7p5g Total loading time: 0 Render date: 2024-07-15T07:21:17.386Z Has data issue: false hasContentIssue false
  • English
  • Français

Partition coefficients of alkali and alkaline-earth elements between alkali feldspar phenocrysts and their lava matrix

Published online by Cambridge University Press:  05 July 2018

Renzo De Pieri  and
Sergio Quareni
Renzo De Pieri
Affiliation:
Istituto di Mineralogia e Petrologia dell'Università, Corso Garibaldi 37 35100 Padova, Italy
Sergio Quareni
Affiliation:
Istituto di Mineralogia e Petrologia dell'Università, Corso Garibaldi 37 35100 Padova, Italy
Get access Rights & Permissions [Opens in a new window]

Summary

Plots of partition coefficients (mineral/ matrix) against ionic radius of the alkali and alkaline earth elements in forty-four alkali feldspars from rhyolites and trachytes show two kinds of diagram, one for homogeneous alkali feldspars with a single peak, and the other for cryptoperthites with a wide spread of points, which cannot represent a single peak, but may probably be explicable in terms of two peaks. The difference in behaviour does not seem to be due to the chemical composition, but is apparently related to the crystallo-graphic features of the alkali feldspar structures. In particular the presence of two peaks in the diagrams of the cryptoperthites seems to be due to the existence of lattice positions suited to receive bigger ions (K, Ba, Rb) and smaller ions (Na, Ca, Sr) in the potassic and sodic domains.

Type
Research Article
Information
Mineralogical Magazine , Volume 42 , Issue 321 , March 1978 , pp. 63 - 67
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 1978

Access options

Get access to the full version of this content by using one of the access options below. (Log in options will check for institutional or personal access. Content may require purchase if you do not have access.)

References

De Pieri, (R.), De Vecchi, (Gp.), Gregnanin, (A.), and Piccirillo, (E. M.), 1977. Mere. Sci. Geol. 32, 1-22.Google Scholar
De Pieri, (R.), De Vecchi, (Gp.) and Quareni, (S.), 1973. Acta Crystallogr. B29, 1483-7.CrossRefGoogle Scholar
De Pieri, (R.), De Vecchi, (Gp.) and Quareni, (S.), 1974. C.N.R. Padova, I-23.Google Scholar
Higuchi, (H.) and Nagasawa, (H.), 1969. Earth Planet. Sci. Letters, 7, 281-7.CrossRefGoogle Scholar
Jensen, (B. B.), 1973. Geochim. Cosmochim. Acta, 37, 2227-42.CrossRefGoogle Scholar
Onuma, (N.), Higuchi, (H.), Wakita, (H.), and Nagasawa, (H.), 1968. Earth Planet. Sci. Letters, 5, 47-51.CrossRefGoogle Scholar
Phillips, (M. W.) and Ribbe, (P. H.), 1973. Am. Mineral. 58, 263-70.Google Scholar
Philpotts, (J. A.) and Schnetzler, (C. C.), 1970. Geochim. Cosmochim. Acta, 34, 307-22.CrossRefGoogle Scholar
Piccirillo, (E. M.), Gregnanin, (A.), and De Pieri, (R.), 1975. Atti Mere. Acc. Pad. Sci. Lett. Arti, 87, 51-90.Google Scholar
Ribbe, (P. H.), Megaw, (H. D.), Taylor, (W. H.), Ferguson, (R. B.), and Traill, (R. J.), 1969. Acta Crystallogr. B25, 1503-18.CrossRefGoogle Scholar
Whittaker, (E. J. W.) and Muntus, (R.), 1970. Geochim. Cosmochim. Acta, 34, 945-56.CrossRefGoogle Scholar