Keywords and Phrases
Potassium oxide; Sodium oxide
"Flame photometric analyses for K₂O and Na₂O were run on 31 samples of the Precambrian igneous rocks of Missouri. Samples were collected from the field, physically prepared and dissolved by a standard method and a modified standard method of rapid silicate analyses. The K₂O, Na₂O values obtained are averages between two methods of analyses. The modified method reduces by 80% the time required to chemically digest a rock sample. The results for both methods are not significantly different. Curtin and Company Advanced Flame Photometer was used.
Results have been plotted on graphs and a chronological sequence for the named Precambrian igneous rock units of Missouri is indicated. It is suggested that the Middlebrook Group belongs to a separate magmatic cycle; that the Van East, Musco, and Bevos Groups belong to the same magmatic cycle; and that the basic intrusive rocks belong to a separate magmatic cycle"--Abstract, page ii.
Kennedy, Richard R. (Richard Ray)
Sutherland, Richard Orlin
Proctor, Paul Dean, 1918-1999
Webb, William H.
Geosciences and Geological and Petroleum Engineering
M.S. in Geology
Missouri School of Mines and Metallurgy
v, 51 pages
© 1962 Erwin Joseph Mantei, All rights reserved.
Thesis - Open Access
Geology, Stratigraphic -- Precambrian
Geology -- Missouri
Print OCLC #
Electronic OCLC #
Link to Catalog Record
Mantei, Erwin Joseph, "K₂O/Na₂O content as a possible index to the chronological sequence of some Precambrian igneous rocks of Missouri" (1962). Masters Theses. 7623.