Outcrop of Gabbro Xenoliths in G3-Granite
by Metwally Hamza, Research Assistant in the field of geology with international published research papers. Academically interested in cosmic geology & planetary sciences. Geology fiend who likes to take photos of nature & geological features, Egypt
- Gabbro is a mafic, basic, dark igneous rock. Contains from 45% to 55% silica (SiO2). The main essential minerals are olivine, pyroxene, amphibole, muscovite, and biotite. The accessory minerals are ilmenite, sphene, spinel, and sulfide.
- G3-Granite "generally Granite" is a felsic, acidic, light igneous rock. Contains more than 66% silica (SiO2). The main essential minerals are muscovite, quartz, plagioclase, alkali-feldspars. The accessory minerals are spinel. Generally, G3-Granite is alkali to per-alkaline granite, includes riebeckite.
- There are two main terms in petrological studies; xenolith and off-shot. Xenoliths "Enclaves" are old rocks in other containing new rocks, which cannot be metamorphosed by these new ones. Off-shots are new rocks in other containing old rocks, which are stable in very extreme conditions.
Metwally Hamza (distributed via imaggeo.egu.eu)