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Origin and emplacement of the Aguablanca magmatic Ni-Cu-(PGE) sulfi de deposit, SW Iberia: A multidisciplinary approach

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Piña García, Rubén and Romeo Briones, Ignacio and Ortega Menor, Lorena and Lunar Hernández, Rosario and Capote del Villar, Ramón and Gervilla, Fernando and Tejero López, Rosa and Quesada Ochoa, Cecilio (2010) Origin and emplacement of the Aguablanca magmatic Ni-Cu-(PGE) sulfi de deposit, SW Iberia: A multidisciplinary approach. Geological Society of America Bulletin, 122 (5/6). pp. 915-925. ISSN 0016-7606, ISSN 1943-2674 (On line)

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Official URL: https://doi.org/10.1130/B30046.1


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Abstract

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.


Item Type:Article
Subjects:Sciences > Geology
Sciences > Geology > Petrology
ID Code:43542
Deposited On:05 Jul 2017 08:43
Last Modified:11 Dec 2018 08:46

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