A9R18EC.tmp 19 - The sedimentary rocks (2) The sedimentary...

Info iconThis preview shows page 1. Sign up to view the full content.

View Full Document Right Arrow Icon
This is the end of the preview. Sign up to access the rest of the document.

Unformatted text preview: The sedimentary rocks (2) The sedimentary rocks (3) These rocks are formed by the process of deposition of disintegrated rock particles that may or may not include remains of plants and animals. The sedimentary rocks There 2 major groups: Sedimentary rocks of detrital origin (e.g. sandstone). Sedimentary sandstone). Sedimentary rocks of organic or chemical origin Sedimentary (form from chemical reactions, e.g. limestone, silex) silex) Common examples of sedimentary rocks include sandstone, shale, limestone, dolomite and coral. Source: S. Vanapalli The sedimentary rocks (4) •Sedimentary rocks of detrital origin (e.g. sandstone). sandstone). Sandstone is one of the most common sedimentary rocks. It is made from sand grains eroded from older rocks, cemented together and then hardened into new rock. Sandstone The sedimentary rocks (5) Sedimentary rocks of chemical origin (e.g. sandstone). sandstone). Limestones Limestones are predominantly crystalline calcium carbonate (calcite) formed under water (i.e., chemicals precipitating from solution, and from the remains of marine organisms and action of plant life) (c) 2001 Andrew Alden, licensed to About.com, Inc •Source: University of Texas •Source: Mineralogical Society of America The metamorphic rocks (2) The metamorphic rocks (1) Sedimentary and igneous rocks may be altered due to the metamorphic action of heat, pressure and permeation of chemicals and fluids to form metamorphic rocks. These processes always occur in solid state. The word "Metamorphism" comes from the Greek: meta = change, morph = form, so metamorphism means to change form. The main types of metamorphism are: The Local metamorphism The local metamorphisme can be divided local in 3 sub-groups: subA) Contact metamorphism (action of temperature) temperature) B) Dynamic metamorphism (friction in the fault) fault) C) Impact metamorphism (fall of meteorites) meteorites) Example of metamorphic rocks: schist, gniess. •Source: Ariel Ferland-Roy Ferland- A) Local metamorphism B) Regional metamorphism (changes in great masses of rock over a wide area) The metamorphic action may significantly change (positively or negatively) the physical properties of rocks. •Source: Ariel Ferland-Roy Ferland- Prof. M. Fall - University of Ottawa 19 ...
View Full Document

Ask a homework question - tutors are online