GEO 1111 Lecture Notes - Lecture 12: Magma Chamber, Ore, Chromite

• School: University of Ottawa
• Department: Geology
• Course: GEO 1111
• Professor: Robert Jack Cornett

Document Summary

Minerals deposits are found in a variety of plate tectonic settings depending on where thre procesese operate - slide 32. Hydrothermal ore deposits == associated with igneous activity - 2) disseminated. Dissolved metals precipitate from the fluids as they rise and cool. These fluids are corrosive and can leach metals from the rocks. Sedimentary hosted deposits: placer deposits formed when heavy metals are mechanically concentrated by currents in rivers. More than half of the gold recovered historically came from placers ex klondike. Sedimentary hosted deposits: outh af(cid:396)i(cid:272)a(cid:859)s fossil pla(cid:272)e(cid:396) deposits, the la(cid:396)gest (cid:272)o(cid:374)(cid:272)e(cid:374)t(cid:396)atio(cid:374) of gold o(cid:374) ea(cid:396)th is i(cid:374) the a(cid:374)(cid:272)ie(cid:374)t pla(cid:272)e(cid:396) deposits of the wit(cid:449)ate(cid:396)s(cid:396)a(cid:374)d basin, co(cid:374)glo(cid:373)e(cid:396)ates deposited a(cid:271)out (cid:1006). 7 (cid:271)illio(cid:374) (cid:455)ea(cid:396)s ago. Diamonds: most diamonds are found in rare ultramafic igneous rocks called kimberlites, ki(cid:373)(cid:271)e(cid:396)lite (cid:373)ag(cid:373)a o(cid:396)igi(cid:374)ates at g(cid:396)eat depth (cid:894)>(cid:1005)5(cid:1004) k(cid:373)(cid:895) a(cid:374)d (cid:396)ises (cid:395)uickly to the surface, picking up diamonds from the upper mantle.