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In these Lecture Slides, the Lecturer has tried to illustrate he following points : Linking Chemistry, Manual Calculations, Mineralogy, Norms, Compositions, Bulk Analysis, Proportion Area, Weight, Normative Minerals, Mineralogy Consistent
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Using the attached procedure and table, calculate CIPW norms for the following two samples:
Sample 1 Sample 2 SiO 2 61.52 51. TiO 2 0.73 0. Al 2 O 3 16.48 19. Fe 2 O 3 1.83 1. FeO 3.82 4. MnO 0.08 0. MgO 2.80 1. CaO 5.42 4. Na 2 O 3.63 8. K 2 O 2.07 4. P 2 O 5 0.25 0.
Explain why it is not possible to have both quartz and olivine, or quartz and feldspathoids, in the same rock.
Use now the excel file available to you, either on the computer in the prac. room or on webCT (cipw-simple.xls). This file allows you to calculate norms for reasonable compositions (don’t expect it to work perfectly for “weird” compositions, though). Enter the major elements composition at the top (“bulk analysis”, yellow) and read the results in the weight proportion area (green).
(based on a problem by J.D. Winter, p.152)
Basalt SiO 2 49. TiO 2 0.
Al 2 O 3 15. Fe 2 O 3 3. FeO 7. MnO 0. MgO 6. CaO 9. Na 2 O 2. K 2 O 1. P 2 O 5 0.
On the basis of their normative composition, rocks can be regarded as silica oversaturated (normative quartz) or silica undersaturated (normative olivine and/or foids).
Series A A1 A2 A3 A SiO 2 41.60 44.30 54.99 56. TiO 2 2.66 2.51 0.60 0. Al 2 O 3 14.33 14.70 20.96 19. Fe 2 O 3 5.48 3.94 2.25 2. FeO 6.17 7.50 2.05 2. MnO (^) 0.26 0.16 0.15 0. MgO (^) 6.39 8.54 0.77 1. CaO (^) 11.89 10.19 2.31 2. Na 2 O (^) 4.79 3.55 8.23 7. K 2 O (^) 3.46 1.96 5.58 5. P 2 O 5 1.07 0.74 0.13 0.