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Unformatted text preview: EAS 1700 Worksheet, Exercise Set 6 Y OUR N AME ……………………………………… 4 March 2011 T HE R OCK C YCLE AND ITS E VOLUTION : T HE W ORKSHEET The following questions presume familiarity with the accompanying document, “The Rock Cycle and Its Evolution,” and with earlier exercise sets concerned with the rock cycle. E XERCISE 1 : Limestone is more abundant than dolostone in sedimentary rocks of the last 100 Myr, but the reverse is true in older rocks. Bearing in mind that the calcite [CaCO 3 ] in limestone dissolves in dilute solutions of carbonic acid, such as ordinary rainwater and groundwater, and that the dolomite [CaMg(CO 3 ) 2 ] does not, how could one explain the time- trend in the relative abundances of these carbonates? (10 points) E XERCISE 2: C ONTINENTAL S ILICICLASTICS What type of plate-tectonic environment is most abundantly represented by the first billion years of sedimentary rock laid down on continents? (2 points) What type of plate-tectonic environment is most abundantly represented by the last billion years...
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- Spring '11
- Rock Cycle, Limestone, Archean, OCEAN Eh