The Magmatic–Hydrothermal Transition and Origin of Brine in the Oceanic Core Complex of the Mid-Atlantic Ridge at 13° Nстатья

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Дата последнего поиска статьи во внешних источниках: 10 августа 2018 г.

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[1] The magmatic–hydrothermal transition and origin of brine in the oceanic core complex of the mid-atlantic ridge at 13o n / A. N. Pertsev, N. S. Bortnikov, V. Y. Prokofiev et al. // Doklady Earth Sciences. — 2018. — Vol. 480, no. 1. — P. 661–665. New data on local mineral associations and the microheterogeneity of minerals and fluid inclusions in gabbro were obtained for the gabbro–peridotite oceanic core complex with a long-lived detachment fault controlling the hydrothermal activity. It is assumed that the hydrothermal hydrogen-bearing fluid with a NaCl content of >30 wt % is formed in the seawater/harzburgite (∼1/5) reaction of serpentinization. The brine residual after serpentinization interacted with gabbro at the final stages of crystallization of an intrusion and assimilated some components (K, REEs, and Ba) from the residual melt. The interaction was resulted in metamorphic transformations of gabbro at decreasing temperature below 500oC. The reaction of the decomposition of magmatic titanomagnetite with the transition of iron reduced to Fe2+ into newly formed chlorinebearing amphibole at 540–450oC and logf(O2) from –20 to –24 is shown. [ DOI ]

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