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Título del libro: Mineral Resources To Discover, Vols 1-4
Título del capítulo: New insights on the formation of magnetite-apatite deposits: the Artillero magnetite prospect (Mexico)

Autores UNAM:
GILLES PIERRE RENE LEVRESSE; RODOLFO JOSE DE JESUS CORONA ESQUIVEL;
Autores externos:

Idioma:

Año de publicación:
2017
Resumen:

The Artillero magnetite prospect is a satellite Fe deposit within the world-class Pena Colorada Iron district. We present a new field observation of the Artillero mineralization styles, Sr-Nd isotopes from Fe mineralization apatite and U/Pb ages from host sequence and Fe-mineralization. The Artillero Fe-prospect shows features that strongly suggest that it formed by the emplacement of an iron-rich melt in a shallow subaqueous environment and capping a zone of abundant breccias and feeder dykes, dated at ca. 80 Ma. The deposition of magnetite was synchronous with the deposition of welded volcanic rocks, dated at ca. 80 Ma. The welded volcanic rocks are slightly younger than the host sequence (ca. 85 Ma). The likely source of melts was mantle derived material with low crustal contamination. Fluid- and iron-rich melt ascended through strike-slip structures related to the compression/extension caused by the post-Laramide inversion. The shallow emplacement of the magmatic chamber favored the separation of large amounts of low density aqueous fluids, increasing the wetting properties and the explosivity of the ascending iron-rich magma. The Fe mineralization is syn-eruptive, sourced from an an explosive eruption at a subaerial or fluviatil to deltaic environment.


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