Computer Science
Scientific paper
Nov 1968
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1968gecoa..32.1149g&link_type=abstract
Geochimica et Cosmochimica Acta, vol. 32, Issue 11, pp.1149-1163
Computer Science
2
Scientific paper
The distribution of manganese between coexisting biotite and hornblende for 80 mineral pairs from igneous rocks of diverse provenance (including Southern California, Sierra Nevada, Boulder, and Boulder Creek batholiths and the Jemez Mountains volcanics) has been determined by neutron activation analysis. Data on the distribution ratio ( K d = Mn hornblende / Mn biotite ) indicate that an equilibrium distribution of Mn is closely approached, though not completely attained, in most samples from plutonic environments. Comparison of K d values of mineral pairs with bulk chemical composition of host rocks reveals no correlation. Because initial crystallization temperatures vary with rock composition, the lack of correlation of composition with K d suggests that the equilibrium distribution of Mn between biotite and hornblende reflects exchange at subsolidus temperatures rather than initial crystallization temperatures. The highest K d values are for volcanic rocks, in which rapid quenching prevents subsolidus redistribution of Mn. For sample pairs from the Southern California and Sierra Nevada batholiths there is a positive correlation of K d with TiO 2 content of biotite. Though the evidence is not compelling, K d may also correlate with the rate of cooling and/or the presence or absence of sphene in the rock.
Gottfried David
Greenland Paul L.
Tilling Robert I.
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