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Geology and mineralization of the main mineral zone of the Santa Eulalia District, Chihuahua, Mexico



Geology and mineralization of the main mineral zone of the Santa Eulalia District, Chihuahua, Mexico



Transactions of the Society of Mining Engineers of American Institute of Mining, Metallurgical and Petroleum Engineers, Incorporated (AIME) 241(2): 228-260



The main mineral zone occurs in a gently warped dome with simple associated structures and contains orebodies distributed through a vertical range of over 900 m. Middle Cretaceous limestones form the bulk of the Cerro de Santa Eulalia and are unconformably overlain by Tertiary tuffs and flows intercalated with continental sediments. Abrupt shrinkage in the volume of limestones associated with large replacement orebodies occurred during mineralization. Contacts of limestone with igneous sills and fossiliferous limestone beds have been important localizers of orebodies. Thrust zones displacing diabase sills are intruded by rhyolite porphyry sills, to which mineralizers are related. Fields of unreleased strain may have influenced orebody locations, the zoning pattern may be a reflection of the filtering effects of large volumes of limestone, and metal-rich brines mobilized or incorporated in the porphyry might be the source of mineralizers.

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Accession: 019042817

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