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Biotites and associated minerals as markers of magmatic fractionation and deuteric equilibration in granites

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Abstract

Analyses of 80 biotite, alkali feldspar, oligoclase, hornblende, Fe-Ti oxide separates from the coarse-grained granites of a late-hercynian epizonal diapir, the Ploumanac'h complex, Brittany, show that these minerals display a regular concentric cryptic layering related to fractional crystallization. The Ca, Mg, Ba, Sr, Cr, V content of minerals decreases as the Na, Fe, and Rb content increases. Biotites become more dioctahedral towards the outer residual syenogranite, with a correlative K deficiency. Trioctahedral biotites from the inner accumulative monzogranite are secondarily oxidized with a gain of Fe3+ and a loss of OH. This alteration id due to the percolation of exsolved fluids rich in H2O and containing a small amount of CO2, F, S, Cl. During this autometamorphic stage, trace elements like Rb, Sr are completely redistributed on the scale of hand specimens, with a restricted range of partition coefficients between biotite, perthite and oligoclase. This equilibration occurred at a temperature about 550 ° C and a fluid pressure about 1,000 bars, with f H2O probably less than 500 bars. A later stage of fluid circulation along fractures brings up a slight Li metasomatism. Biotites are a sensitive marker of both magmatic and postmagmatic stages of subsolvus or ‘wet’ plutonites.

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  1. Laboratoire de Pétrologie, Université de Bretagne Occidentale, F-29283, Brest Cedex, France

    Michel Barrière & Joseph Cotten

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  1. Michel Barrière
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  2. Joseph Cotten
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Barrière, M., Cotten, J. Biotites and associated minerals as markers of magmatic fractionation and deuteric equilibration in granites. Contr. Mineral. and Petrol. 70, 183–192 (1979). https://doi.org/10.1007/BF00374447

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