Lognormal-type distributions in igneous rocks--IV

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

Apr 1963

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1963gecoa..27..333a&link_type=abstract

Geochimica et Cosmochimica Acta, vol. 27, Issue 4, pp.333-343

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The general statistical nature of the distribution of the oxides of the abundant elements (Si, Al, Na, K, Mg, Ca, Fe II , Fe III , Mn, Ti and P) in 343 granitic rocks from Japan has been considered. The distribution of the most abundant constituent, SiO 2 , shows decided negative skewness; K 2 O might also be negatively skewed. With the exception of Na 2 O which appears to approach normality, all other constituents are positively skewed in varying degrees and in this respect apparently have the same tendency as many trace elements. The negative skewness of SiO 2 bears out the comment by Aubrey that it is not possible for every abundant constituent of a specific material to have a positively skewed distribution. All published examples of element distributions in specific igneous rocks are summarized and classified into four categories: 1. (i) positive skew lognormal-type--by far the most common distribution (34 examples), 2. (ii) negative skew (one and possibly two examples) 3. (iii) normal or near normal (one example) and 4. (iv) uncertain assignment (five examples).

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