Computer Science
Scientific paper
Jul 1964
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1964gecoa..28.1187r&link_type=abstract
Geochimica et Cosmochimica Acta, vol. 28, Issue 7, pp.1187-1197
Computer Science
1
Scientific paper
Frequency distribution diagrams are presented for Ga, La, Mn, Pb, Rb, Sr, Y and Zr in 130 acid igneous rocks from Africa, and major constituents are shown for 92 of the samples. Specimens from (a) younger non-orogenic complexes and (b) older basement plus older orogenic occurrences are present in approximately equal numbers; their respective contributions are compared and contrasted. Differences exist which suggest two distinct populations, and regional enrichments also affect the patterns. Calcium in a mixed group of rocks has a lognormal type distribution, but the older population within the group is near-normal and does not require logarithmic transformation. It is suggested that it would be unwise to adopt lognormality as a routine basis for comparison of data in a geochemical province investigation, since positively-skewed joint distributions have component populations which follow the normal law in some cases.
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