Lab_GEOL111_Rocks1 Ig and Sed

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Binghamton University *

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GEOL-111

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Geology

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Apr 3, 2024

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Geology 111: Lab: Rocks Part 1. Name: _______Anya Donders____________________ Lab Partner(s): ______________________ Lab Instructor: ______________________ Lab Day (Circle One): M T W R F M

Fig. 1. Estimating mafic and felsic minerals.

Figure 2. Igneous rock identification. Igneous Rock Identification Part 1. Determining mafic/felsic. Look at the four rocks at Station 1 and using the chart above, estimate the percentages of mafic and felsic materials for the below samples and then give them a label as to whether they are felsic, intermediate, mafic, or ultramafic. Finally, using your knowledge of these concepts, identify a possible geologic environment for each of these materials (e.g., spreading ridge, continental mountains, etc.) Sampl e % Mafic mineral % Felsic mineral Label (felsic, Possible geologic

s s mafic, etc.) environmen t A 30 70 intermediat e Oceanic and continental B 10 90 felsic Continental C 10 90 felsic Continental D 85 15 felsic Continental Part 2. Differences between the same type of rocks. Here, we are going to look at three samples of granite. You’ll note many of these rocks are polished- these are countertop samples that stores discard and allow folks to come pick up for free. You can think of this as a geologists’ Christmas. We use these for teaching, decoration, just about everything- for example, all of my kitchen trivets are just discarded countertop pieces. The polished samples help us see the minerals a bit better when we’re first learning, so that’s why they make great teaching tools! First, list the minerals in each and describe them- how did you identify them and are the general percentages of each? Then, use your understanding of Bowen’s reaction series to discuss how their formation differed from one another! Use specific minerals and (relatively specific) temperatures, as well as specific discussion of crystal sizes. Smaller sample (“golden brown granite”) is A, Larger sample (“Kim Meyers’ kitchen”) is B. Non-countertop sample is C. B: 15% (mostly felsic) light mineral, igneous rocks. C: 50% intermediate the cooling rate was quick and there was 2 cooling cycles because crystals aren’t that large and there are different grain sizes filing the cracks A: 30% (felsic) There is a lot of potassium vs sample B because it Is pink. Part2. Identifying rocks by features.

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