Homework%201_weathering

Homework%201_weathering - GEOL 3430 Homework#1 Weathering...

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GEOL 3430 Homework #1 Weathering Rates Purpose: To examine factors that influence the rate of chemical weathering of rocks. Learning goals : By the end of this exercise, students should be able to: 1. Distinguish the dependent and independent variables in a study 2. Given a dataset, construct scatter plots [and analyze for simple linear correlation] between two variables in a spreadsheet program; be able to explain relatively strong and weak correlations and the pattern you would see for each in a scatter plot. 3. Describe the results of your simple linear correlation analysis between key climate variables and rate of chemical weathering. 4. Describe the results of your simple linear correlation analysis between rate of chemical weathering and rate of erosion. 5. Given a source rock and information on climate variables, predict the residual particles and secondary minerals likely to form as products of weathering. Introduction As you have seen in class and your textbook, the rate of chemical weathering is influenced by several factors, including climate and the nature of the source rock. This exercise is taken from a 2004 research study that examined how climate specifically mean annual precipitation (MAP) and mean annual temperature (MAT) influences the rate of chemical weathering. The study by Riebe et al. (2004), referenced below, looked at weathering in different study sites with different climatic regimes for which they had known values of MAP and MAT. The rock type in all study areas was granitic. Chemical weathering rates were determined by measuring chemical depletion of elemental Na, Ca, and Si, which are key components of granitic rocks. If you are interested in how this was accomplished, take a look at the publication by Riebe.

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