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Georgia Institute Of Technology *
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Course
1122
Subject
Geology
Date
Jun 21, 2024
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4
Uploaded by ProfElementCrow39
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.
Abenezer Bekele Laboratory Exercise –
Sedimentary Rock Identification Sample # Grain Size Minerals or grain type Fizz in acid? Describe Sedimentary Rock Name Example See the sample above Gravel Rock Fragments No Rounded fragments Conglomerate 1. 0.06-2mm grain type Yes Coarse grained Arkose 2. 2-6mm grain type No Fine grained Diatomite 3. >2mm Grain type No Subangular Conglomerate
4. 1-3mm Grain type No Coarse grained Proxenities 5. 0.004mm Grain type No Fine Grained Shale your grain size choices are gravel, sand, silt, clay, or N/A
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Abenezer Bekele 6. <10mm Mineral No Fine Grained Anthracite 7. <0.05mm Grain Yes Fine Grained Gypsum 8. 2mm Grain Yes Coarse grained Coquina 9. 0.5mm Grain Yes Visible Grained Quartz Sandstone 10. 1mm Grain Yes Fine Grained Basalt 11. <5cm Grain No Fine Grained Granite 12. 0.063-
2mm Grain No Fine grained Greywacke 13. ?>2mm Grain No Round grained Beccia 14. 0.02-
0.22mm Mineral No Fine Grained Coal 15. <0.01mm Grained No Crystal Grained Granite