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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)
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.
Entidades citadas de la UNAM:
Fuente:
ISBN: 9782981689801 Editorial: SOC GEOLOGY APPLIED MINERAL DEPOSITS-SGA