Fig. 2. Simplified geological map of Río San Juan complex modified from Draper and Nagle (1991) and Escuder-Viruete et al., (2013a, b), showing major lithological units, neogene brittle structures, and representative structural attitudes of rocks. The late Jobito basal detachment (JBD) juxtaposes the upper Jobito and lower Guaconejo structural subunits. The Morrito fault zone (MFZ) emplaced the blueschist nappe on top of the Jagua Clara high-P mélange. Locations of serpentinized peridotite lenses (s) are indicated. Peridotite massifs: GH, Gaspar Hernández; LC, Loma Catey; LM, Loma El Morrito; EH, Helechal.