402-lab11 - Lab 11 GY 402 Sedimentary Petrology (2012)...

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Lab 11 GY 402 Sedimentary Petrology (2012) Carbonate Thin-sections 4: The Good, the Bad, and the Ugly Sides of Carbonate Diagenesis Diagenetically modified limestones 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: This is the last lab that you will be responsible for in GY 402, but it is in many ways the toughest. It deals with carbonate diagenesis. You need to concentrate on the post depositional attributes of the thin-sections. These include cementation, dissolution, grain alteration and dolomitization/silicification. As you know, carbonates would be pretty boring-thin sections were it not for chemical staining. The stain not only distinguishes between the major carbonate minerals (i.e. aragonite\calcite; CaCO 3 ) and dolomite; CaMg(CO 3 ) 2 ) but also resolves subtle differences in the Fe 2+ content of the carbonate minerals. Don't forget this! Most Recent and modern carbonate-
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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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