THE NYF PEGMATITES OF THE POTRERILLOS GRANITE, SAN LUIS RANGE, ARGENTINA

ROQUET M. B.; BERNARD, F.; LIRA, R.; GALLISKI M. A.

Mendoza

Simposio; 5th International Symposium on Granitic Pegmatites; 2011

The intragranitic pegmatites of Potrerillos have been less studied than the comparatively more widespread LCT pegmatites typically hosted in metamorphic rocks of the San Luis range. Theywere considered as possible examples of NYF or Hybrid pegmatites by Galliski (1994 a,b). Thisinterpretation was supported by preliminary trace element geochemistry of K-feldspar and muscovite, which evidenced some primitive patterns typical of barren or poorly evolved granitic pegmatites (Galliski et al. 1997). In this communication, we address their geological setting, mineralogy and geochemistry, based on recent detailed studies carried out by Bernard (2009) and Roquet (2010), whose data classify the studied Potrerillos units as rare-element pegmatites of the RELREEsubclass and allanite-monazite type.