hi there every body .
i have some problem with these two terms "Foliation" and "Lineation" in metamorphic rocks. please any body can explain these two terms comprehensively so that i may say tnank you to him???
Foliation is banding caused by minerals. The banding may be highlighted by structure (mineral cleavage), texture (mineral shapes) or composition. So a gneiss will be compositionally foliated. A schist is foliated with the mineral texture (and possibly structure).
As for linneation, I think that means any straight (linear) feature in a rock. So foliation could be a linneation if the foliation was linear in nature. Make sense?
Do people agree with these definitions?
Geologists are gneiss!!
I'd agree with that Jon.
I'd sort of agree.
A foliation is a 2D (planar) fabric made by platy minerals such as mica in schists.
A lineation is a 1D (linear) fabric made by rod like minerals such as hornblende in a garbenschiefer or quartz in slickenside lineations.
Geologists like a nappe between thrusts