Phase equilibria of a fluorine-rich leucogranite from the St. Austell pluton, Cornwall

Details Phase equilibria of a fluorine-rich leucogranite from the St. Austell pluton, Cornwall Phase equilibria of a fluorine-rich leucogranite from the St. Austell pluton, Cornwall

Jun 1987

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987gecoa..51.1591w&link_type=abstract

Geochimica et Cosmochimica Acta, vol. 51, Issue 6, pp.1591-1597

Computer Science

3

Scientific paper

Highly evolved leucogranitic rocks in the St. Austell pluton, Cornwall, of Hercynian age, contain accessory muscovite, topaz and fluorite. We have studied the H 2 O-saturated melting behavior of one representative sample. Its solidus and liquidus pass through the points 663 and 725°C, respectively, at 1 kbar, 640 and 665°C at 2 kbar, 610 and 717°C at 4 kbar and 608 and 700+°C at 8 kbar. Plagioclase is on the liquidus at low pressure and topaz is on the liquidus at 4 kbar: The fluorite is consumed in the formation of the first-formed liquid. Calcium can partition into an evolved granitic melt if complexed by fluorine. The fluorite appears to be largely primary in fresh fluorite granite at St. Austell and not to reflect the albitization of oligoclase in the surrounding biotite granite. Such fluorine-rich leucogranites can be expected to be of subsolvus character.

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