%0 Journal Article
%A Romeo Briones, Ignacio
%A Tejero López, Rosa
%A Capote del Villar, Ramón
%A Lunar Hernández, Rosario
%T 3D gravity modelling of the Aguablanca Stock, tectonic controland emplacement of a Variscan gabbronorite bearing aNi–Cu–PGE ore, SW Iberia
%D 2008
%@ 0016-7568
%U https://hdl.handle.net/20.500.14352/49578
%X The Aguablanca stock is a Variscan mafic pluton located in the Ossa-Morena zone,southern Iberian Massif, hosting an unusual Ni–Cu–PGE mineralization associated with magmaticbreccia pipes which intruded its northern part. The emplacement of the Aguablanca stock and themineralized breccia pipes are related to the activity of the Cherneca ductile shear zone, a Variscansinistral shear zone that favoured magma ascent through the upper crust. A detailed gravity study hasbeen carried out in order to investigate the 3D geometry of the Aguablanca intrusion and to get insightsabout the emplacement mechanism and tectonic controls of the mineralization. The three-dimensionalgravity modelling shows that the stock has an inverted drop geometry with a feeder zone in contactwith the Cherneca ductile shear zone. The inferred orientation of the feeder zone suggests that theemplacement probably took place along an open tensional crack formed within the strain field of theadjacent Cherneca ductile shear zone. The modelling of the breccia pipes hosting the Ni–Cu–PGE oreshows that they are included inside the feeder zone, thus their emplacement is probably controlled bysuccessive opening events of this tensional crack.
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