4 (harder): Samples with % abundances of each of the components. Follow the clas

Question

4 (harder): Samples with % abundances of each of the components. Follow the classification Consider polycrystalline foliated quartz as a rock fragment (12 points) 1BUG83 38UG201 4BUG9 scheme of Folk (1980 SBUG201 52.29 | 29.79 44.44 18.99 1.82 0.00 3.23 4.65 0.81 50.10 15.36 0.38 0.19 1.34 1.73 1.54 77.88 18.36 Quartz-Monocrystalline Quartz- Rhyolite Silicic Glass Siltstone Chert Schist Felsic Intrusive (Undif.) Phyllite Amphibole Group (Undif.) Sillimanite 0.16 3.76 1.77 0.00 0.00 0.38 0.00 0.00 13.24 0.00 0.96 0.58 3.03 0.22 0.22 0.00 2.63 0.00 1.21 1.21 1.62 1.01 0.20 0.00 1.15 0.00 0.33 0.16 Feldspar Group (Undif.) Anorthite Granite Muscovite Plagioclase Alkali Feldspars Biotite 0.22 0.44 0.22 0.22 0.00 0.00 0.00 0.16 0.00 3.76 0.33 0.00 0.00 0.00 1.15 0.16 1.55 LI Gneiss 0.00 0.00 Clay Minerals Quartz- Polycrystalline, Foliated Claystone Orthoclase 2.22 0.00 0.77 0.38 0.00 0.00 0.00 0.00 1.01 0.61 0.61 L Slate Cordierite L I volcanoclastic Rock Fragment LI Mylonitic Rock Fragment L Extrusive Rock Fragment (Undif.) 0.00 1.82 0.00 0.00 0.58 0.00 NAME

Explanation / Answer

flok proposed a classification for sandstones based on relative abundances of quartz feldspars and rock fragments.these are main poles of classification diagram.to define the clan name one must normalize the sum of abundance of quartz feldspars and rock fragments to 100%.this means that other constituents that dont fit in these categories are disregrarded after this the relative percentage of quartz feldspares and rock fragments are used to plot the appropriate point on a QFR triangle and obtain the clan designation. there are some expertations when summing the abundance due to difficult in distinguishing quartz from metaquartzite rock fragments metaquartzite is always plotted on Qpole QFR diagram

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