Homework #3 Rocks and Geologic Process of the Front Range, CO

Homework #3 Rocks and Geologic Process of the Front Range, CO

Homework #3 Rocks and Geologic Process of the Front Range, CO

Homework #3 Rocks and Geologic Process of the Front Range, COOn the syllabus, one of the goals stated for this course is for you to be able to interpret how arock or outcrop (rock exposure) that you observe around Boulder, CO may have formed.This homework is a review of many of the ideas and concepts covered through the semesterthat we covered that are necessary in order to achieve that goal and a practice to apply this skillon six rock samples from about Boulder, CO.Tip #1: Compile all of your mastery quizzes, mineral homework and notes in order to completethis homework. You will be referring back to the rock cycle, characteristics of minerals(homework#2), igneous rocks, in addition to the current topics of weathering and clasticsedimentary rocks.Tip #2: This homework is review a large number of concepts from the past four weeks. DO NOTwait until the last minute to look at the homework (this homework is a great review for the examon Sept 28-29th)Tip #3: The homework does need to be completed in order. In fact answering what you can firstmay be beneficial to work through ideas.Pre homework questions (1 pt):Below are statements that reflect some of what you should be getting out of this assignment.1. Before you complete the assignment, rate how true each of the following statements is foryou using a scale of 1-5, where.These answers for the pre-question are graded only for being complete (1 pt all or nothing)and not what your answers are.Your rating(1 through 5)1. I can identify the common rock forming silicate minerals basedon their physical appearance and provided diagnosticproperties2. I am comfortable identifying is a rock is igneous, sedimentary ormetamorphic based on appearance and description.3. I can identify which of the nine common igneous rocks a sample isbased on mineralogy composition and texture.4. Based on the rock type (e.g. sedimentary, igneous, or metamorphic)and its appearance, I can infer the conditions under how that rockformed.Location #1: Flagstaff RoadAnswer the questions to identify each of the rocks that can be seen on Flagstaff Road inBoulder, and provide a short answer about what were the geologic conditions that createdthat rock.After identifying the rock and it minerals, you are asked to write a sentence describing howit formed. See below for the information that you will need to include the followingIgneous rocks:What was the magma composition involved to create the rock?What the most likely source to create that magma (e.g continental crust/oceaniccrust/mantle)?Where did the magma cool, at the surface or at depth?What was the cooling rate, quickly or slowly?Example: Basalt – A mafic magma was created by partially melting the mantle. This magmathen cooled quickly at the surface to create a basalt.Sedimentary Rocks:What are the shape of the sediment?What is sorting of the sediment?What is name of the rock?Based on the grain characteristics, did the sediments experience a long weatheringperiod or a short weathering period?Example: A well sorted, well rounded sandstone that implies that the sediments were weathereda long time before being deposited.Rock Sample #1This is a picture of a rock commonly seen upBoulder Canyon, just west of the city. It asinterlocking, visible crystals of the mineralMineral A: Black, shiny, and breaksinto sheetMineral B: Pink in color and hard.Mineral C: Clear in color and very hard,does not have a cleavage.5. Mineral A described in the rock is:6. Mineral B described in the rock is:7. Mineral C described in the rock is:8. What is the rock type of this sample? (Sedimentary, Igneous, or Metamorphic):9. What is the rock name for this sample?10. How did rock sample #1, which is commonly found in Boulder Canyon, form? Be sure torefer to the direction to ensure you include all of the information for a complete answerRock Sample #2This is a picture of a rock that makes up the Flatirons.Loose pieces of varying sizes that touch each other,but do not interlock.Most of the grain size rangefrom fine sand to course sand, with some gravelpieces.The visible crystals that can be seen are of mainlytwo mineral typesMineral A: Clear, whitish in color. Hard to break butwhen it does, it fractures.Mineral B: Pink in color. Well-formed crystals have arectangular11. What is Mineral A in this rock?12. What is Mineral B in this rock?13. What rock type is this sample? Igneous, Sedimentary, or Metamorphic.14. Based on the picture and the description, how would describe the sorting of the grains in thissample? Well sorted or poorly sorted?15. Based on the picture and the description, what is the name of the rock pictured here?16. How long were the grains that make up Rock Sample #2 exposed to the surface andweathered? Be sure to refer to the directions to ensure that you include all information for acomplete answer.Location #2: Lefthand CanyonAnswer the questions to identify each of the rocks that can be seen on Lefthand Canyon,North of Boulder, and provide a short answer about what were the geologic conditions thatcreated that rock.After identifying the rock and it minerals, you are asked to write a sentence describing how itformed. See below for the information that you will need to include the followingIgneous rocks:What was the magma composition involved to create the rock?What the most likely source to create that magma (e.g continental crust/oceaniccrust/mantle)?Where did the magma cool, at the surface or at depth?What was the cooling rate, quickly or slowly?Example: Basalt – A mafic magma was created by partially melting the mantle. This magmathen cooled quickly at the surface to create a basalt.Sedimentary Rocks:What are the shape of the sediment?What is sorting of the sediment?What is name of the rock?Based on the grain characteristics, did the sediments experience a long weatheringperiod or a short weathering period?Example: A well sorted, well rounded sandstone that implies that the sediments were weathereda long time before being deposited.Rock Sample #3Scattered larger crystals in a fine crystalline gray matrix(also known as groundmass). Contains way more Na-richplagioclase feldspar than potassium feldspars for otherrocks typically from thisMineral A: Clear in color, no fractureMineral B: White and light colored, with two planes ofcleavageMineral C: Black in color, shiny, layered in fine sheets17. What is mineral A in this sample?18. What is mineral B in this sample?19. What is mineral C in this sample?20. Based on the three mineral identifications and descriptions of the rock, what is theclassification of the chemical composition?21. What was the rate or crystallization/rate of cooling for this sample?22. How did Rock Sample #3, a dacite found in Lefthand Canyon, form? Be sure to refer to thedirections to ensure that all information is included for a complete answer.Rock Sample #4This sample is found close Highway 36 onLefthand Canyon Road and is also seen whilehiking Mt. Sanitas. It contain clasts of only onemineral and feels sandy when touched. Themineral is light to clear in color, with a glassyappearance, very hard, and no cleavage planes.23. What rock type is this sample? Igneous, Sedimentary, or metamorphic?24. What is the mineral present in this sample?25. What is the sorting present in this rock? Well sorted or poorly sorted?26. What is the level of rounding in this rock sample? Angular or well rounded?27. What is the name of this rock?28. How long were the grains that make up Rock sample #4 exposed to the surface andweathered? Be sure to refer to the directions to ensure that you include all information for acomplete answer.Location #3 Valmont ButteAnswer the questions for the rock that makes up the Valmont Butte, in East Boulder, andprovide a short answer about what were the geologic conditions that created that rock.After identifying the rock and it minerals, you are asked to write a sentence describing how itformed. See below for the information that you will need to include the followingIgneous rocks:What was the magma composition involved to create the rock?What the most likely source to create that magma (e.g continental crust/oceaniccrust/mantle)?Where did the magma cool, at the surface or at depth?What was the cooling rate, quick or slow? Slow than quick?Example: Basalt – A mafic magma was created by partially melting the mantle. This magmathen cooled quickly at the surface to create a basalt.Sedimentary Rocks:What are the shape of the sediment?What is sorting of the sediment?What is name of the rock?Based on the grain characteristics, did the sediments experience a long weatheringperiod or a short weathering period?Example: A well sorted, well rounded sandstone that implies that the sediments were weathereda long time before being deposited.Rock Sample #5Dark colored rock, finely crystalline but no visible crystals.Igneous cuts through pre-existing continental sedimentaryrock as a dike intrusion.29. What is the rock type of this sample? Igneous,Sedimentary, or metamorphic?30. Based on crystal size, what is the name of the type oftexture for this sample?31. What is the rate of crystallization/rate of cooling for this rock?32. What is the likely chemical composition of this rock sample?33. What is the name of this rock sample?34. How did sample #5 from Valmont Butte form? Be sure to refer to the directions to ensurethat all information is present for a complete answer.Post homework questionsBelow are statements that reflect some of what you should be getting out of this assignment.After you completed the assignment, rate how true each of the following statements is for youusing a scale of 1for the post-question are graded only for being complete (2 pts) and not what your answers are.Your rating(1 through 5)35. I can identify the common rock forming silicate minerals based ontheir physical appearance and provided diagnostic properties36. I am comfortable identifying if a rock is igneous, sedimentary, ormetamorphic based on appearance and description.37. I can identify which of the nine common igneous rocks a sample isbased on mineralogy composition and texture..38. Based on the rock type (e.g. sedimentary, igneous, or metamorphic)and its appearance, I can infer the conditions under how that rockformed.39. In the space down below, write a sentence on what skills or knowledge you are feeling moreconfident on now after completing this exercise OR what questions you may still have aftercompleting this exercise.Tip#4: Use your answers to the pre and post homework questions to help determine (a) theideas/concepts you know and are comfortable with and (b) which ones you feel you need tostudy more before the final.

 

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