Liam Murphy - GEOL200 - Lab Assignment 09 [MARKED]

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Geology

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Oct 30, 2023

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Liam Murphy 8 e ’.O 3540040 : o GEOL 200 - Introductory to Physlcal Geology ;* s g Lab Assignment #9 September 7™, 2021 S 1. Refer to the vertical cross sections in Geologic Cross Sections 3 and 4 on page 224 of the Laboratory Manual (Activity 8.2), and determine the relative ages of the rock bodies and other lettered features. Indicate the relative age relationships by placing the letters on the blanks below, from oldest (at the bottom) to youngest (at the top). Indicate the presence of unconformities in your sequences for,each cross section. For example, in Geologic Cross Section 3, an unconformity occurs after unit A and before unit E. (Hint: When interpreting geologic cross sections, always start with the question: What was there first? That is, the interpretation of cross sections is usually easier if you proceed from the oldest event to the youngest.) Note the types of unconformities (disconformity, nonconformity, etc.) and the age of the unconformity in relation to the rock strata. Geologic Cross Section 3 Strata Types and ages of unconformities Infill Erosional Surface, Non Conformity v Surface Erosional Surface, Non—Conformity,g/ Fault Line f" g - X¢ J4 Conformable Contacts [ Conformable Contacts Conformable Contacts Youngest Erosional Surface, Non-Conformity / Conformable Contacts i Conformable Contacts Igneous Dike, Intrusive lgnegus‘Contact 1y Conformable Contacts, » ' o 3 A Conformable Contacts . * Angular Unconformity |,/ ¢ Fault Line iyt Intrusive Igneous Body Country Rock TTTTTEETITTITIT Oldest Geologic Cross Section 4 Strata Types and ages of unconformities Youngest House Infill Infill Erosional Surface, Non-Conformity v _Z Surface Erosional Surface, Non-Conformity v ? Fault Line Intrusive Igheous Contact Conformable Contacts Conformable Contacts Erosional Surface, Non-Conformity / Liam Murphy Unit 11: Waves, Beaches, and Coasts GEOL 200 Lab Assignment #9 Athabasca University Page 1 of 4 September 7th, 2021 8 2t TITTTTTER

' Liam Murphy Intrusive Igneous Dike Conformable Contacts Conformable Contacts Erosional Surface, Non-Conformity v Infill Erosional Surface, Non-Conformity v Conformable Contacts Erosional Surface, Non-Conformity \/ Intrusive Igneous Dike Fault Line Conformable Contacts Conformable Contacts Conformable Contacts Erosional Surface, Non—Conformlty.,/ Fault Line Country Rock [TTTTTTTTT PRrER- Oldest Examine Figures 9.1 and 9.2 that you have just completed above, and identify all of the zones where you would expect to find contact metamorphism (distinguish the layer causing the metamorphism from the layer being metamorphosed). Keep in mind the mode of origin of the various rock types and the principles for determining relative ages. Remember that contact metamorphism only occurs at the contact where hot igneous rocks have intruded older rocks. A layer of rock deposited after an intrusion and an unconformity does not undergo contact metamorphism. For example, on Figure 8.8, unit D is not metamorphosed at its contact with unit B. Geologic Cross Section 3 e PandF A\so E @ X e RandM ; e HandM = . e AandM R R Geologic Cross Section 3 AandV Aand L Also 11dey AandF ] SandV . Sand O Sand M Sand X SandB E and X Answer Activity 8.4 questions A-C (page 226), and Activity 8.5 questions A (1-3) (page 227) and B (page 228) in the Laboratory Manual. Activity 8.4 b 14 ks * A. A solidified lava flow containing zircon mmeral crystals is present in a sequence of rock layers that are eXposed ina hillside. A mass spéctrometer analysis was used to count the atoms of uranium-235 and lead-207 lsotopes in zircon samples from the lava flow. The analysis revealed that 71% of the atoms were uranium-235, and 29% of the atoms were lead-207. Refer to Fig 8.14 to help you answer the following questions. e Unit 11: Waves, Beaches, and Coasts GEOL 200 ; Lab Assignment #9 Athabasca University . Page 2 of 4 September 7', 2021

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