GEO 1111 Lecture 9: Lec 9 Sedimentary rock

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

Document Summary

Rock types are based on the source of the material: detrital/clastic rocks: transported sediment as solid particles chemical rocks: sedi(cid:373)e(cid:374)t that pre(cid:272)ipitates fro(cid:373) sol(cid:859) (cid:374) or e(cid:454)tra(cid:272)ted fro(cid:373) (cid:449)ater (cid:271)(cid:455) orga(cid:374)is(cid:373)s (converted to shells/skeletons) Physical features in rock tell how seds were deposited & environmental conditions of deposition: weathering (breakdown, erosion (mass wasting) Physical & chemical changes (weakening & break down rockes into smaller peices) that occur in rocks when they are exposed to the atmosphere & biosphere. Chemical weathering: oxidation= oxygen, hydration= water absorbed by mineral creatinf syrtallss and expanding, hyrdoliiss and carbination. Soils are also host to a variety of vegetation, bacteria and organisms that produce an acidic environment which also promotes chemical weathering. Minerals in a rock buried in soil will therefore break down more rapidly than minerals in a rock that is exposed to air: 4.