Gabbro(Габбро)

 

Petrography of gabbro samples. A) Sample SBST19 olivine-hornblende gabbro containing highly altered plagioclase. B) SBST05 leucogabbro sample from which zircons were extracted showing heavily altered plagioclase, hornblende and free quartz. C) SBST17 leucogabbro (plane polarized) containing kaersutite. D) SBST16 gabbro (plane polarized light) containing several thin lenses of felsic melt. E) SBST16 gabbro (plane polarized light) containing thin lenses of felsic melt. F) SBST16 gabbro (cross polars) showing plagioclase and quartz crystallized in the stringers of melt with actinolite needles growing from the surrounding hornblende into the melt patch. G) SBST20 pegmatitic gabbro containing resorbed plagioclase, hornblende, kaersutite H) SBST20 pegmatitic gabbro (cross polars) showing the cross-hatch twinning of microcline that has crystallized with quartz in the melt veins.