402-lab7 - Lab 7 GY 402 Sedimentary Petrology (2012)...

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Lab 7 GY 402 Sedimentary Petrology (2012) Volcaniclastic Sedimentary Rock Thin-sections Tuffs in thin section (field of view for each approximately 2 mm). From Williams, H., Turner, F.J and Gilbert, C.M., 1954. Petrography. W.H. Freeman & Co., 406pp. Introduction: Rocks containing grains dominantly produced by volcanic eruptions are a problematic class in sedimentary petrology. Are they volcanic or are they sedimentary? Well, they're really both. The specimens that you will see today include crystal tuffs (some flow banded; Group A), vitric tuffs, lithic tuffs (both Group B), and “reworked” pumice rich-sandstones, some of which contain carbonate cements (Group C). Identifying the various components comprising these rocks should be a snap for you (you’re almost experts in sedimentary petrography). Lab exercise (do in your note books, not re-doable): The list of volcaniclastic thin-sections that will be available in the lab is shown on the bottom of this page. All specimens have accompanying hand
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This note was uploaded on 02/05/2012 for the course GLY 402 taught by Professor Staff during the Fall '11 term at S. Alabama.

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402-lab7 - Lab 7 GY 402 Sedimentary Petrology (2012)...

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