Silica standardization: a discriminant technique applied to a volcanic arc system

Details Silica standardization: a discriminant technique applied to a volcanic arc system Silica standardization: a discriminant technique applied to a volcanic arc system

Sep 1983

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1983e%26psl..64..387r&link_type=abstract

Earth and Planetary Science Letters, Volume 64, Issue 3, p. 387-395.

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A classic tholeiitic, calc-alkaline, and shoshonitic island-arc sequence has developed in western Luzon, the Philippines, as a result of subduction defined by an eastward-dipping Benioff zone. A simple technique of standardizing the data allows chemical concentrations to be recast to ``andesite equivalent'' compositions. Based on the excellent linear correlations that exist between SiO2 and other elements, individual analyses were standardized to 55% SiO2 by projecting parallel to least-squares regression lines. Raw and SiO2-standardized data were then treated by an univariate one-factor analysis of variance and a multivariate discriminant function analysis.
Results of the analysis of variance indicate that at the 99% confidence level; 20 of the 27 chemical variates discriminate between at least two of the three geographically distinct magma series; SiO2-standardized data generally discriminate better than do raw data; and K2O, Ba, Rb, Sr, and Zr provide the best discrimination. Better classification of samples into the appropriate series is obtained from results of the discriminant function analysis using the SiO2-standardized data rather than results using the raw data. With this standardizing technique it was possible to detect offsets of SiO2-standardized K2O isopleths along the Manila Bay fracture zone that correspond to offsets in contours of depths for earthquake foci.

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