Lognormal-type distributions in igneous rocks--V

Details Lognormal-type distributions in igneous rocks--V Lognormal-type distributions in igneous rocks--V

Aug 1963

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1963gecoa..27..877a&link_type=abstract

Geochimica et Cosmochimica Acta, vol. 27, Issue 8, pp.877-890

Computer Science

2

Scientific paper

The statistical nature of the distribution of Mg, Fe (total), Co, Ca and Sr in basaltic rocks and in granitic rocks has been examined. The numbers of samples for each element are: Mg, Fe, Co--basaltic rocks--130 specimens (analytical data of and , 1961); Ca, Sr--basaltic rocks--250 specimens (analytical data of and , 1956); Mg, Co--granitic rocks--32 specimens (analytical data of and , 1961); Ca, Sr--granitic rocks--141 specimens (analytical data of and , 1956). In addition, the distributions of Al 2 O 3 , Mg, FeO and Fe 2 O 3 in 343 Japanese granitic rocks has been re-examined. With the exception of Sr in granites, all distributions are either lognormal or closely approach lognormality. The distribution of Sr in granites might be unique and appears to be caused by the relationship between Sr 2+ and singly charged K + . The constituents under consideration show a wide range of dispersion. Mg and Co (both in granites) have the largest dispersion and Al 2 O 3 , also in granites, the smallest. The dispersion of Fe (total) in basaltic rocks is comparatively small and approximately equal to that of Ca but decidedly smaller than that of Mg. The dispersion of Co in basaltic rocks is between that of Mg and Fe (total). Certain relationships between the magnitude of dispersion and element abundance are discussed.

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