Hydration, 18 O enrichment and oxidation during ocean floor hydrothermal metamorphism of ophiolitic metabasic rocks from E. Liguria, Italy

Details Hydration, 18 O enrichment and oxidation during ocean floor hydrothermal metamorphism of ophiolitic metabasic rocks from E. Liguria, Italy Hydration, 18 O enrichment and oxidation during ocean floor hydrothermal metamorphism of ophiolitic metabasic rocks from E. Liguria, Italy

Jul 1977

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1977gecoa..41..857s&link_type=abstract

Geochimica et Cosmochimica Acta, vol. 41, Issue 7, pp.857-859

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Scientific paper

During ocean-floor hydrothermal metamorphism of a 225 m thick allochthonous Jurassic sequence of ophiolitic pillow lavas and underlying material in E. Liguria, Italy, the rocks were hydrated, enriched in 18 O and oxidised. H 2 O + contents increased from ~0.3 to 3.8 wt.%, 18 O values increased from ~ +6 to values as high as +13.2 , and ( Fe 2 O 3 / FeO *) increased from 0.18 to ratios as high as 1.0. Both 18 O values and oxidation ratios decrease in the original direction of increasing depth. Pillow margins are consistently more enriched in 18 O and are more oxidised than cores. These observations are qualitatively interpreted in terms of a non-isothermal, heterogeneous reaction model of interaction of basalt with oxygen-bearing sea water during flow through the packed bed of pillows. Fluid flow approximated undirectional downward motion, and occurred in the recharge part of a cycle of single pass convection. Mass transfer through the pile was by flow (infiltration metasomatism), whereas intra-pillow mass transfer was diffusional. Oxygen isotope exchange and oxidation did not occur under conditions of perfect incremental equilibrium. An integrated bulk volumetric water/rock ratio of ~2 × 10 3 :1 is estimated from the oxidation profile.

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