Volcanic reconstruction of the Early Cretaceous El Largo and Naranjo VMS deposits, Campo Morado District, Guerrero Terrane, Mexico

The Campo Morado volcanogenic massive sulphide (VMS) deposits are located in an Upper Jurassic - Lower Cretaceous sedimentary dominated, calc-alkaline felsic volcanic sequence within the north trending Teloloapan subterrane of the Guerrero Terrane, southern Mexico. Four of the nine known deposits and occurrences have a combined resource of 29Mt to date. Over 13Mt of this resource is contained within the El Largo and Naranjo deposits.; The VMS hosting Campo Morado formation (fm) represents a thin (generally <400m) volcanic and volcaniclastic sequence dominated by coherent rhyolite, rhyolite breccia, heterolithic volcaniclastic breccia, massive to semi-massive sulphide, and both volcanic-derived and hemi-pelagic sedimentary rocks. Detailed facies analysis of the Campo Morado fm at El Largo and Naranjo has resulted in a reconstruction of the paleo-volcanic environment.; Felsic volcanism at Naranjo was dominantly extrusive as indicated by the occurrence of flow top breccia facies along stratigraphic tops of laterally continuous coherent rhyolite units. (Abstract shortened by UMI.)*; *This dissertation is compound (contains both a paper copy and a CD as part of the dissertation). The accompanying CD requires the following system requirements: Adobe Acrobat.