EAE1011 Lecture Notes - Lecture 12: Continental Crust, Polymerization, Equant

• School: Monash University
• Department: Science - Atmospheric Science
• Course: EAE1011
• Professor: Marion Anderson

Document Summary

Eae1011 lecture 12 - earth, atmosphere and environment. When rocks are subjected to changes in pressure and temperature, the minerals within (cid:272)ha(cid:374)ge . When anything is subjected to changes in pressure and temperature, the chemical structure change. P and t vary depe(cid:374)di(cid:374)g o(cid:374) lo(cid:272)atio(cid:374) i(cid:374) the (cid:272)rust . At the earth"s surfa(cid:272)e p a(cid:374)d t are lo(cid:449), as (cid:455)ou go deeper (cid:271)oth i(cid:374)(cid:272)rease. P = gh (cid:894) = de(cid:374)sit(cid:455), g= gra(cid:448)it(cid:455), h= height(cid:895) Density of continental crust rock is ~ 2. 7 g/cm3 = 2700 kg/m3. So, at a depth of 10km (10,000m) beneath the surface (density = 2700) (gravity = 9. 8) (height = 10,000) P= 2700x 9. 8x 10000 = 264. 6 mpa(megapascals), or 2. 65 kbar(kilobars) Whereas at the surface p= 0. 1 mpa. Note: the density of rock increases with depth, so p does not increase linearly. Long thin minerals or flat minerals align along axis of least pressure i. e, at right angles to direction of pressure (90 degrees)