Engineering Geology and Seismology. Geological Identification of Rocks
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1 Lecture # 6 Engineering Geology and Seismology Geological Identification of Rocks Instructor: Prof. Dr. Attaullah Shah Department of Civil Engineering City University of Science and IT Peshawar 1
2 Characterizing Rocks As already discussed, there are 3 major types of rocks IGNEOUS formed from molten magma SEDIMENTARY formed from sediment (soil, sand, etc,) METAMORPHIC formed by applying heat and pressure to other existing rocks
3 The Rock Cycle a representation of the interrelationship between different types of rocks.
4 Characterizing Rocks The three major characterizing features of rocks are: Color Composition (Mineralogy/Chemistry) Texture Note: Even the most sophisticated geological classification schemes are based on these features
5 Characterizing Rocks Classification by Color Color Index (used mainly for igneous rocks) Leucocratic light color Mesocratic intermediate color Melanocratic dark color and/or Felsic rich in light colored minerals Mafic rich in dark colored minerals
6 Igneous Rocks Textures of Igneous Rocks Aphanitic fine-grained. Individual grains seen with naked eye can t be Phaneritic - grains easily seen with the naked eye Porphyritic larger grains in finer grains Inclusions > Xenoliths > Xenocrysts
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10 Vesicular & Glassy Textures
11 Xenoliths
12 Xenocryst
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15 Sedimentary Rocks Detrital & Chemical Rock Classification Detrital Rocks Conglomerate Sandstones Siltstone Chemical Rocks Limestone Chert (Flint) Salt (Evaporite) Shale
16 Detrital Sedimentary Rocks Detrital rocks are classified based on particle size and grain shape
17 Detrital Sedimentary Rocks Conglomerates Poorly Sorted particle sizes Well-rounded particles Usually particles are gravel sized
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21 Detrital Sedimentary Rocks Breccia Poorly sorted grains Angular grains Gravel sized grains
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24 Detrital Sedimentary Rocks Sandstone Well sorted particles Particles can be angular to rounded Sand-sized Particles
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27 Detrital Sedimentary Rocks Shale Microscopic grain size Consist of silt and clay size grains Cannot see grains with naked eye Occur in quiet depositional environments
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30 Chemical Sedimentary Rocks Classification Inorganic - Not produced by living things. Biochemical - Are produced by or are remnants of living things (e.g. shell fragments, coral reefs, etc)
31 Chemical Sedimentary Rocks Limestone Most abundant chemical rock Inorganic (oolitic limestone, Travertine) or Biochemical (Chalk, Coquina)
32 Limestone (Chemical Rocks) Travertine Common in caves Happen when calcium carbonate is precipitated out of groundwater
33 Limestone (Chemical Rocks) Coquina Consists of loosely cemented shell fragments
34 Fossiliferous limestone Limestone
35 Fine-grained limestone
36 Chemical Sedimentary Rocks Chert (Flint) Consists of Microcrystalline Silica Two major occurrences of chert Irregular shaped nodules in limestone layers of rock Most likely Biochemical
37 Cross-section through a geoid showing silica layering
38 Flint
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40 Metamorphic Rocks Classified into two main groups Foliated Rocks Non-foliated Rocks
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42 Metamorphic Rocks Foliated Rocks Progression of Shale to Gneiss Slate Low Metamorphic Grade Phyllite Schist Gneiss High Metamorphic Grade
43 Metamorphic Rocks Foliated Textures Slaty - very fine-grained, fissile Phyllitic - fine-grained, foliated, shinny Schistose - foliated, large grains visible Gneissic - light and dark bands
44 Slate Parent Rock Shale Slaty Cleavage
45 Phyllite Parent Rock Slate Characteristic sheen/shine Phyllitic Texture
46 Schist Parent Rock Phyllite Characteristic scaly appearance Schistosity
47 Gneiss Parent Rock Schist Characteristic of light and dark banding Gneissic Texture
48 Metamorphic Rocks Non-foliated Rocks Rocks that show no Foliation Crystalline Rocks Marble Quartzite Anthracite (coal)
49 Marble Parent Rock Limestone or Dolostone Reacts to Acid
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51 Parent Rock Sandstone Moderate to high metamorphism Very Hard Quartzite
52 Parent material Plant matter High metamorphism Shinny and hard Anthracite (coal)
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COMPOSITIONAL TERMS: FELSIC : light colored INTERMEDIATE : medium shades MAFIC : dark colored ULTRAMAFIC : rare (composition of the mantle)
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