Abstract
Bulk chemical compositions of a series of gabbroic rocks and their recrystallized equivalents have been compared with their specific gravities, using the equation of Gresens (1967). By careful control of parent-daughter rock matching the volume increase of the gabbroic rock-amphibolite transition has been established at 2 ± 0.5%. On that basis the metasomatic effect accompanying the transition has been calculated.
For SiO2, TiO2, Al2O3, FeO*, MgO, P2O5, Sr, Y and Zr no mass transfer could be shown by statistical testing (α = 0.05). The following components were added to the basic rocks during amphibolite formation: Cl (+ c. 230%), L.O.I, mainly H2O (+ c. 50%), Th (+ c. 25%), K2O (+ c. 55%), Rb (+ c. 80%), Pb (+ c. 100%), Zn (+ c. 15%), MnO (+ c. 6%) and Na2O (+ c. 5%). The following components were removed: S (- c. 60%) and CaO (c. 5%). Iron transfer could not be shown, but the increase in Fe2O3/(FeO + Fe2O3) ratio from c. 0.’8 to c. 0.22 is statistically highly significant.
The element migration pattern is suggested to be characteristic for the present type of setting: tholeiitic gabbroic sills/dykes intruded into amphibolite facies gneisses and subsequently metamorphosed in (lower) amphibolite facies.
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Zeck, H.P., Toft, J. (1989). Mass Balance of a Gabbroic Rock-Amphibolite Transition. In: Bridgwater, D. (eds) Fluid Movements — Element Transport and the Composition of the Deep Crust. NATO ASI Series, vol 281. Springer, Dordrecht. https://doi.org/10.1007/978-94-009-0991-5_18
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DOI: https://doi.org/10.1007/978-94-009-0991-5_18
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