Geochemistry of actinolitic hornblendes from tonalitic rocks, Northern Portugal

Details Geochemistry of actinolitic hornblendes from tonalitic rocks, Northern Portugal Geochemistry of actinolitic hornblendes from tonalitic rocks, Northern Portugal

May 1974

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1974gecoa..38..789d&link_type=abstract

Geochimica et Cosmochimica Acta, vol. 38, Issue 5, pp.789-803

Physics

3

Scientific paper

Chemical analyses are given for actinolitic hornblendes of tonalitic rocks from the Hercynian belt of Northern Portugal. The distribution of elements between amphibole and co-existing biotite is studied. The composition of the amphiboles is analysed in the light of experimental data on amphiboles and the physical conditions of crystallization inferred from the study of the biotite and rock series. The data on the biotites lead to the definition of a temperature of 800°C for the crystallization of actinolitic hornblendes with Mg/(Mg + Fe) ratios of 0·72-0·61 at pressures of about 3 Kb and fO 2 defined by FMQ.

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