Abstract
In the mining district of Santa Eulalia, Chihuahua, northern Mexico, the mineralization (consisting of simple massive concentrations of lead-zinc-iron sulphides and oxides confined in largely unaltered Cretaceous limestones) has traditionally been related to several intrusive emplacement events that occurred during the Tertiary. However, the relative age relationships of the intrusives, volcanics and mineralization have proved difficult to establish. In this work we report palaeomagnetic results which permit definition of the mean relative age relationships for the igneous units and their correlation with the mineralizing event. The mean directions and pole positions for the intrusives, mineralization and volcano-sedimentary cover (capping series) indicate a Tertiary age (Eocene-Miocene). The intrusives show normal, intermediate and reverse polarities, suggesting several emplacement events or a long period of intrusion. The direction and polarity of the remanent magnetization for the mineralization correlates with those for the felsites, which occur as a complex set of sills and dykes, and they are therefore penecontemporaneous with the mineralization.
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