Integrated petrological and Fe-Zn isotopic modelling of plutonic differentiation
نویسندگان
چکیده
The upper continental crust is formed from chemically diverse granitic plutons. Active debate surrounds the range of physical conditions (P-T-X- f O 2 ) and differentiation processes which occur in mush bodies that solidify to form Transition metal stable isotopes are increasingly employed trace magmatic both extrusive lavas intrusive plutonic suites, with a focus on analysis whole rock powders. However, studies suites often overlook complex textures represented within coarse grained samples, how these will influence isotopic compositions. Here we examine calc-alkaline Boggy Plain Zoned Pluton, SE Australia, closely approximates closed system behaviour during differentiation. We combine petrological examination Fe Zn biotite, hornblende magnetite mineral separates Whole composition (as ? 56 Fe) increases 0.038‰ 0.171‰ decreasing MgO content, while display heavy isotope enrichment order > biotite = pyroxene. A lack correlation between compositions suggests variation predominantly driven by fractional crystallisation: specifically balance crystallisation isotopically magnetite, light silicates. To demonstrate this quantitatively, temperature dependent mineral-melt fractionation factors were derived separate data (? mag-melt 0.17 × 10 6 /T ? bt/hbd-melt ?0.12 used construct models successfully reproduce observed crystallisation. These compared theoretical empirical estimates previous studies. highlight accurate determinations modal mineralogy critical when modelling variations suites. Successful interpretation equilibrium relatively simple suite like Pluton paves way for be investigate more bodies.
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ژورنال
عنوان ژورنال: Geochimica et Cosmochimica Acta
سال: 2022
ISSN: ['1872-9533', '0016-7037']
DOI: https://doi.org/10.1016/j.gca.2021.12.018