Contact between Ortho-gneiss and Para-gneiss
by Metwally Hamza, Full Geologist, Egypt
- para-gneiss is derived from sedimentary rocks.
- ortho-gneiss is derived from igneous rocks.
- the difference in the field outcropping between para-gneiss and ortho-gneiss is that para-gneiss is leucocratic to mesocratic "light-colored", but ortho-gneiss is melanocratic to hyper-melanic "dark-colored".
Taken and Itemized by Metwally Hamza.
Taken on 30
Submitted on 26 March 2021
Credit: Metwally Hamza (distributed via imaggeo.egu.eu)
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