The Mississippi Valley-type Zn-Pb deposit of San Vicente, Central Peru: an Andean syntectonic deposit

Germanium- and gallium-rich sphalerite in Mississippi Valley–type deposits: the San Vicente district and the Shalipayco deposit, Peru

“…Reactivation of pre-Andean, steeply dipping NW -SE and NE -SW striking fractures resulted in the formation of horsts and grabens that controlled the facies of the Pucará Group sediments and could also act as feeders during mineralization. MVT mineralization along the belt was most probably synchronous with first overthrusting in the Sub-Andean region (Dávila et al 2000;Badoux et al 2001), which occurred as early as in Upper Cretaceous -Paleocene times according to Baby et al (2019), during the Peruvian episode of the Andean orogeny (see Benavides-Cáceres 1999). This time constraint of the mineralization based on structural features in the San Vicente deposit accords well with Rb-Sr dates on sphalerite from the Florida Canyon MVT deposit at ca.…”

“…Fontboté 1993;Leach et al 2005;Merino and Canals 2011;Kelka et al 2017), breccia, and vein textures and structures. Zebra, vein, and breccia fabrics occur also abundantly in barren parts of the ore-bearing units with similar textures (Fontboté and Gorzawski 1990;Fontboté et al 1995;Spangenberg 1995;Badoux et al 2001). Volumetrically minor Fe-poor orange and yellow sphalerite is found in steep veins that cross-cut the main mineralization and belongs to a minor second mineralization step in the San Vicente deposit that, as explained below, has a particular geochemical signature.…”