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    Thin crust and exposed mantle control sulfide differentiation in slow-spreading ridge magmas

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    G39287_R1.pdf (1.488Mb)
    Date
    2017-07
    Author
    Ciazela, Jakub  Concept link
    Dick, Henry J. B.  Concept link
    Koepke, Juergen  Concept link
    Pieterek, Bartosz  Concept link
    Muszynski, Andrzej  Concept link
    Botcharnikov, Roman  Concept link
    Kuhn, Thomas  Concept link
    Metadata
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    Citable URI
    https://hdl.handle.net/1912/9313
    As published
    https://doi.org/10.1130/G39287.1
    Keyword
     MORB; Sulfides; Chalcophile elements; Mantle-melt reaction; Slow-spreading ridges 
    Abstract
    Gabbroic veins enclosed in mantle peridotite from ocean core complexes next to oceanic transform faults demonstrate sub-crustal crystallization of silicate minerals from a MORB-like melt. Cooler lithosphere there may also affect sulfide crystallization and the metal budget of the lower and upper crust but the related sulfide behavior is poorly understood. Here, we use chalcophile elements to trace sulfide crystallization in a suite of MORB's erupted at the Kane Megamullion south of the Kane Fracture Zone along the Mid-Atlantic Ridge. Cool lithosphere there is inferred from a low magma supply, and lithostratigraphic evidence for thin crust with abundant mantle rock exposed to the seafloor (Dick et al., 2008). We show that the concentrations of Cu, Zn, As, Ga, Pb, Sb and Tl in the Kane Megamullion MORB's rise linearly with melt differentiation expressed by decreasing MgO and Ni content. The low-pressure fractional crystallization within the crust thus occurs at sulfur-undersaturated conditions. Sulfur-undersaturated MORB's are unusual. At the Kane Megamullion, however, the thin crust allows melt to more extensively interact with the shallow and serpentinized mantle. We argue that sulfur and chalcophile elements have been lost from the melt due to sulfide crystallization during melt-rock reaction in the shallow mantle.
    Description
    Author Posting. © The Author(s), 2017. This is the author's version of the work. It is posted here under a nonexclusive, irrevocable, paid-up, worldwide license granted to WHOI. It is made available for personal use, not for redistribution. The definitive version was published in Geology 45 (2017): 935-938, doi:10.1130/G39287.1.
    Collections
    • Geology and Geophysics (G&G)
    Suggested Citation
    Preprint: Ciazela, Jakub, Dick, Henry J. B., Koepke, Juergen, Pieterek, Bartosz, Muszynski, Andrzej, Botcharnikov, Roman, Kuhn, Thomas, "Thin crust and exposed mantle control sulfide differentiation in slow-spreading ridge magmas", 2017-07, https://doi.org/10.1130/G39287.1, https://hdl.handle.net/1912/9313
     

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