RT Journal Article
T1 Origin and emplacement of the Aguablanca magmaticNi-Cu-(PGE) sulfi de deposit, SW Iberia: A multidisciplinary approach
A1 Piña García, Rubén
A1 Romeo Briones, Ignacio
A1 Ortega Menor, Lorena
A1 Lunar Hernández, Rosario
A1 Capote del Villar, Ramón
A1 Gervilla, Fernando
A1 Tejero López, Rosa
A1 Quesada Ochoa, Cecilio
AB A model is proposed for the origin and emplacement of the ca. 341 Ma Aguablanca magmatic Ni-Cu-(platinum group element [PGE]) sulfi de deposit (SW Iberia) integrating petrological, geochemical, structural, and geophysical data. The Aguablanca deposit occurs in an unusual geodynamic context for this ore type (an active plate margin) as an exotic , magmatic subvertical breccia located at the northern part of the coeval gabbronorite Aguablanca stock (341 ± 1.5 Ma). Structural and gravity data show that mineralized breccia occurs inside the inferred feeder zone for the stock adjacent to the Cherneca ductile shear zone, a Variscan sinistral transpressional structure. The orientation of the feeder zone corresponds to that expected for tensional fractures formed within the strain fi eld of the adjacent Cherneca ductile shear. Two distinctive stages are established for the origin and emplacement of the deposit: (1) initially, the ore-forming processes are attributed to magma emplacement in the crust, assimilation of crustal S, and segregation and gravitational settling of sulfi de melt (a scenario similar to most plutonic Ni-Cu sulfi de ores), and (2) fi nal emplacement of the Ni-Cu sulfi de-bearing rocks by multiple melt injections controlled by successive opening events of tensional fractures related to the Cherneca ductile shear zone.
PB Geological Society of America
SN 0016-7606,  ISSN 1943-2674 (On line)
YR 2010
FD 2010-05
LK https://hdl.handle.net/20.500.14352/42692
UL https://hdl.handle.net/20.500.14352/42692
LA eng
NO Ministerio de Educación y Ciencia (MEC)
DS Docta Complutense
RD 30 abr 2024