Open AccessChemistry of feldspars in the Ilímaussaq augite syenite with additional data on some other minerals
Author(s) -
Lotte Melchior Larsen
Publication year - 1981
Publication title -
rapport
Language(s) - English
Resource type - Journals
eISSN - 2597-2944
pISSN - 0418-6559
DOI - 10.34194/rapggu.v103.7728
Subject(s) - augite , microprobe , feldspar , geochemistry , plagioclase , mafic , geology , mineralogy , euros , albite , chemistry , humanities , quartz , paleontology , philosophy
The feldspars af the augite sycnitc have been described by Ussing (1912, p. 188), Hamilton (1964) and Ferguson (1964, 1970, pp. 49-51). These allthors used optical and X-ray methods giving only crude clues to chemistry. However, Hamilton (1964, pp. 28-29) noted the scarce occurrence ef corroded oligoclase cores, and Ferguson (1970) nored that the Ab/Or ratio is higher in feldspar from the augite syenite than in feldspar from the agpaitic rocks. Belaw are reported the results af a microprobe reconnaissance study ef feldspars from the augitc syenite, together witil microprobe data on some other minerals. Thc two samples selected are the same as used in a previous investigation of the mafic minerals (Larsen, 1976).