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Georgia Institute Of Technology *

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Geology

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Jun 21, 2024

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Abenezer Bekele Sedimentary Rocks (Lab 4) Answer Sheet 1. Which of the following are terrigenous sedimentary rocks? Highlight them or delete the ones that are not terrigenous. Black shale Arkose Intraclastic limestone Diatomite Rock gypsum Quartz conglomerate Oolitic limestone Red sandstone Lignite Graywacke Chert Bituminous coal 2. Describe each of the following: Chalk: reacts with HCL________________________________________ Kaolin form of clay mineral _______________________________________ Diatomite _Does not Fizz Coming in Contact ____________________________________ 3. Compare Shale vs. Claystone: Cleavage refers to the way a rock breaks. Shale has fissile cleavage, meaning it splits easily into thin layers, whereas claystone does not have this property and breaks into more blocky pieces. 4. Rock Type Mineral Name Chemical Formula Reaction to HCl Limestone Calcite and aragonite CaCo3 Yes Dolostone Dolomite CaMg(CO3)2 Yes Rock gypsum Gypsum CaSO4. 2H2O No Rock salt Halite NaCl No Chert Quartz SiO2 No Travertine Calcite CaCo3 Yes 5. (a) rudites , (b) arenites , or (c) argillites . Put the letter in the blank . ___B___ 1. Lithic sandstone ___A___ 2. Conglomerate with quartz clasts ___B__ 3. Arkose what are each of these made of and how can you tell them apart? only when powdered
Abenezer Bekele ___C__ 4. Gray silty shale ___A__ 5. Breccia with iron oxide cement ___C___ 6. Kaolinite 6. (a) calcirudites , (b) calcarenites , or (c) calcilutites . Put the letter in the blank. __A____ 1. Intraclastic limestone __C____ 2. Chalk __B____ 3. Oolitic limestone __A____ 4. Coquina __C____ 5. Micrite 7. Put the letter in the blank. __H____ micrite a. rounded gravel __G____ shale b. plant fragments __F____ graywacke c. microscopic skeletons of silica __C____ chalk d. feldspar grains __J____ diatomite e. angular gravel __B____ lignite f. sand-sized rock fragments __I____ coquina g. clay __D____arkose h. lime mud __A____conglomerate i. broken shells __E____breccia j. coccoliths 8. Allochems ___ Oöids ___________________________ ___ Peloids ___________________________ ___ Extraclasts ___________________________ Rock sample example for the chart below.
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