Google analytics Link

Sierra de Copacabana, Magma Mixing, Argentina

 

Roberto Weinberg
Monash University, Australia

 

 

Mingling and hybridization at the Sierra de Copacabana in Catamarca, Argentina. The most interesting aspect here is the beautiful quartz ocelli and zoned plagioclase. Coordinates: S28 23' 45.9" W67 36' 50.1" (CC12)
Magma Mingling, mafic pillows Magma Mingling, mafic pillows
Figure 1A: Mafic pillow in granite matrix. Figure 1B: Detail of 1A.
mafic pillow hybrid rocks
Figure 1C: Mafic pillow in granite matrix. Figure 1D: This is very close to Figs. 1A-C (metres away) but here it is an intermediate and heterogeneous rock with gabrroic enclave.
hybrid rock hybrid rock
Figure 1E: Hybrid rock with small mafic enclaves and an irregular patch of coarse granite, and an euhedral plagioclase ocelli (surrounded by a fine layer of hornblende. Figure 1F: Hybrid rock with euhedral zoned plagioclase and irregular, embayed large quartz ocelli.
hybrid rock
Figure 1G: Hybrid rock with euhedral zoned plagioclase and irregular, embayed large quartz ocelli.