Replies to post #15232 on USA Graphite Inc fka USGT

[DITRstocks]

USGT Migmatitic networks of Late Cretaceous to Oligocene granite form more than half of the rock volume within the Ruby Mountains in the quadrangle, and intimately inject a framework of relics or rafts of the metamorphosed strata (Howard and others, 1979; Wright and Snoke, 1993; MacCready and others, 1997). Remarkably, these relics outline ghost stratigraphy that traces out large coherent structures even where granitic rocks greatly predominate. Pegmatitic granite intrusions assigned a Cretaceous age are the most abundant, and consist of sills, dikes, and irregular bodies as thick as 100 m. Overprint patterns on the mapped metasedimentary units indicate the proportion of pegmatitic granite in the resulting migmatite. The pegmatite granite becomes proportionally more voluminous toward structurally deep levels, and is mapped separately in canyon bottoms where metasedimentary relics are lacking.