Computer Science
Scientific paper
May 1966
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1966gecoa..30..545r&link_type=abstract
Geochimica et Cosmochimica Acta, vol. 30, Issue 5, pp.545-551
Computer Science
4
Scientific paper
An equation is derived to test the compatibility of an analysis of a mineral with that of its host-rock. It reveals incompatibility in 19 garnet/host-rock pairs of analyses out of 50 pairs published by 8 authors. There are three possible explanations, 1. (1) analytical or printing errors, 2. (2) "garnet" in statements of chemical and/or volume distribution analyses was "garnet plus inclusions", 3. (3) analysed material was not representative of the average garnet. A second equation, derived from the compatibility test, determines the maximum purity of the analysed material compatible with (1) and (2). With two exceptions, purity values range from 34 to 90%. For greater accuracy in major element analyses when mineral homogeneity has not been proven, and particularly when mineral heterogeneity has been demonstrated by means of the electron micro-probe, it may be wiser to analyse high recovery concentrates rather than selectively prepared inclusion-free concentrates.
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