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- W2017455317 abstract "Several reaction-zones occur in the contact between impure calcite marble and corundum-bearing high-grade metapelite in the basement, Alboran Sea (site 976, ODP Leg 161, western Mediterranean). From the metapelite (corundum + biotite + anorthite + K-feldspar ± garnet ± sillimanite) to the marble (calcite + anorthite + biotite + amphibole + clinopyroxene), the sequence of mineral assemblages in these reaction zones is: corundum + hercynite + biotite + anorthite + K-feldspar (Zone I), hercynite + biotite + anorthite + K-feldspar (Zone II), biotite + garnet (Grs 15‐30) + anorthite (Zone III), amphibole + biotite + garnet (Grs 25‐ 33) + anorthite + K-feldspar (Zone IV), anorthite + clinopyroxene (Zone V), and clinopyroxene + garnet (Grs 49‐65) + anorthite (Zone VI). These reaction zones are interpreted as having developed by diffusion metasomatism of Al 2O3, CaO, and SiO2 between the marble and metapelite at 705 650 °C and P < 5 kbar. Phase-relation analysis with chemical potential projections ( Al2O3 ‐ SiO2 ‐ CaO) is consistent with the observed sequence of reaction zones, the mineral assemblages, and the observed variation in the chemical composition of garnet, hercynite, and biotite among the different zones. The behavior of the three diffusing component s is characterized by a slight mean variation in SiO2 and a strong variation in Al2O3 and CaO between the metapelite and the calcite marble. In spite of this, strong gradients in chemical potential are deduced for SiO 2 and Al2O3 through Zone III. In our opinion, this zone was formed under non-ideal conditions of diffusion owing to the heterogeneous character of the protolith, derived partly from a corundum metapelite and partly from a quartz-bearing metapelite." @default.
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- W2017455317 date "2002-02-01" @default.
- W2017455317 modified "2023-09-26" @default.
- W2017455317 title "REACTION ZONES DEVELOPED BETWEEN CORUNDUM METAPELITE AND MARBLE, ALBORAN SEA BASEMENT, WESTERN MEDITERRANEAN: ORIGIN AND PHASE RELATIONS" @default.
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- W2017455317 doi "https://doi.org/10.2113/gscanmin.40.1.85" @default.
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