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Datasets with PANGAEA technical keyword @spp1144Petrol

Mostrando recursos 1 - 20 de 41

  1. Chemical composition of mineral phases of serpentinized and steatized peridotite from the Mid Atlantic Ridge (15°20'N Fracture Zone, ODP Leg209)

    Klein, Frieder; Bach, Wolfgang
    Serpentinization of abyssal peridotites is known to produce extremely reducing conditions as a result of dihydrogen (H2,aq) release upon oxidation of ferrous iron in primary phases to ferric iron in secondary minerals by H2O.We have compiled and evaluated thermodynamic data for Fe-Ni-Co-O-S phases and computed phase relations in fO2,g-fS2,g and aH2,aq-aH2S,aq diagrams for temperatures between 150 and 400°C at 50MPa.We use the relations and compositions of Fe-Ni-Co-O-S phases to trace changes in oxygen and sulfur fugacities during progressive serpentinization and steatitization of peridotites from the Mid-Atlantic Ridge in the 15°20'N Fracture Zone area (Ocean Drilling Program Leg 209). Petrographic observations...

  2. Geochemical composition and crystallization conditions of melts from the Mid Atlantic Ridge near Ascension Island (7-11°S)

    Almeev, Renat; Holtz, François; Koepke, Jürgen; Haase, Karsten M; Devey, Colin W
    Phase equilibria simulations were performed on naturally quenched basaltic glasses to determine crystallization conditions prior to eruption of magmas at the Mid-Atlantic Ridge (MAR) east of Ascension Island (7°11°S).The results indicate that midocean ridge basalt (MORB) magmas beneath different segments of the MAR have crystallized over a wide range of pressures (100-900MPa). However, each segment seems to have a specific crystallization history. Nearly isobaric crystallization conditions (100-300MPa) were obtained for the geochemically enriched MORB magmas of the central segments, whereas normal (N)-MORB magmas of the bounding segments are characterized by polybaric crystallization conditions (200-900MPa). In addition, our results demonstrate close to...

  3. Crystallization conditions obtained after inverse and forward calculations and pressures of partial crystallization of melts from the Mid Atlantic Ridge near Ascension Island

    Almeev, Renat; Holtz, François; Koepke, Jürgen; Haase, Karsten M; Devey, Colin W

  4. Crystallization conditions and compositions of residual melts from the Mid Atlantic Ridge near Ascension Island

    Almeev, Renat; Holtz, François; Koepke, Jürgen; Haase, Karsten M; Devey, Colin W

  5. Geochemical composition of basaltic glasses and glass inclusions from the Mid Atlantic Ridge near Ascension Island

    Almeev, Renat; Holtz, François; Koepke, Jürgen; Haase, Karsten M; Devey, Colin W

  6. Main and trace element composition of rocks from the Mid Atlantic Ridge at MARSUED-IV stations (Inside Corner High)

    Koepke, Jürgen

  7. Trace element and REE element composition of rocks at Station M60/3-53-ROV-2 (Table4)

    Augustin, Nico

  8. Trace element and REE element composition of clay minerals at station M64/2-250-GTV (Table5)

    Augustin, Nico

  9. Trace element and REE element composition of clay minerals at station M64/2-239-GTV (Table5)

    Augustin, Nico

  10. Trace element and REE element composition of clay minerals at station M60/3-78-GTV (Table5)

    Augustin, Nico

  11. Trace element and REE element composition of clay minerals at station M60/3-74-GTV (Table5)

    Augustin, Nico

  12. Trace element and REE element composition of clay minerals at station M60/3-67-GTV (Table5)

    Augustin, Nico

  13. Trace element and REE element composition of clay minerals at station M60/3-62-GTV (Table5)

    Augustin, Nico

  14. Trace element and REE element composition of clay minerals at station M60/3-57-GTV (Table5)

    Augustin, Nico

  15. Trace element and REE element composition of clay minerals at station M60/3-49-GTV (Table5)

    Augustin, Nico

  16. Trace element and REE element composition of clay minerals at station M60/3-35-GTV (Table5)

    Augustin, Nico

  17. Trace element and REE element composition of clay minerals at station M60/3-33-GTV (Table5)

    Augustin, Nico

  18. Trace element and REE element composition of rocks at station M64/2-250-GTV (Table4)

    Augustin, Nico

  19. Trace element and REE element composition of rocks at station M60/3-78-GTV (Table4)

    Augustin, Nico

  20. Trace element and REE element composition of rocks at station M60/3-77-GTV (Table4)

    Augustin, Nico

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