EARTHSC 1G03 Chapter Notes - Chapter 7: Metamorphic Rock, Till, Clastic Rock
5 Apr 2017
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Sedimentary rock: is a rock that forms at or near the surface of the earth in several ways: Cementing together of loose clasts (fragments or grains) thats been produced by physical or chemical weathering of pre-existing rock. By the growth of mounds of shells. By the cementing together of shells and shell fragments. By the accumulation and subsequent alteration of organic matter derived from living organisms. Precipitation of minerals directly from the surface-water solutions. Sedimentary rocks occur only in the upper part of the crust, form a cover that buries underlying basement of igneous/ and or metamorphic rock. Geologists can divide sedimentary rocks into four major classes based on their origin: Clastic sedimentary rock: forms from cemented-together clasts, solid fragments and grains broken off of pre-existing rocks. Organic sedimentary rock: consists of carbon-rich relicts of plants or other organisms. Chemical sedimentary rock: made up of minerals that precipitated directly from water solutions. Clastic rocks are formed in the following steps.
