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Major elements data

Major elements data. Differenciation Magmatic series. 22. 10. Al. O. MgO. 2. 3. 17. 5. 0. 12. 15. 10. FeO*. 10. CaO. 5. 5. 0. 0. 4. 6. 3. Na. O. 2. K. O. 4. 2. 2. 2. 1. 0. 0. 45. 50. 55. 60. 65. 70. 75. 45. 50. 55. 60. 65. 70. 75. SiO. SiO. 2.

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Major elements data

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  1. Major elements data • Differenciation • Magmatic series

  2. 22 10 Al O MgO 2 3 17 5 0 12 15 10 FeO* 10 CaO 5 5 0 0 4 6 3 Na O 2 K O 4 2 2 2 1 0 0 45 50 55 60 65 70 75 45 50 55 60 65 70 75 SiO SiO 2 2 Bivariate (x-y) diagrams Harker diagram for Crater Lake

  3. 12 10 Alkaline 8 %Na2O + K2O 6 4 2 Subalkaline 55 65 40 60 35 45 50 %SiO2 Alkali vs. Silica diagram for Hawaiian volcanics: Seems to be two distinct groupings: alkaline and subalkaline

  4. F o l h e T i i t i c Calc-alkaline M A AFM diagram: can further subdivide the subalkaline magma series into a tholeiitic and a calc-alkaline series Figure 8-14. AFM diagram showing the distinction between selected tholeiitic rocks from Iceland, the Mid-Atlantic Ridge, the Columbia River Basalts, and Hawaii (solid circles) plus the calc-alkaline rocks of the Cascade volcanics (open circles). From Irving and Baragar (1971). After Irvine and Baragar (1971). Can. J. Earth Sci., 8, 523-548.

  5. F Tholeiitic Ferro-Basalt B-A Basalt A D Basalt Andesite Basaltic Andesite R Dacite Rhyolite Calc-alkaline M A

  6. Figure 18-2. Alumina saturation classes based on the molar proportions of Al2O3/(CaO+Na2O+K2O) (“A/CNK”) after Shand (1927). Common non-quartzo-feldspathic minerals for each type are included. After Clarke (1992). Granitoid Rocks. Chapman Hall.

  7. Alkaline Calc-alkaline Tholeitic

  8. A world-wide survey suggests that there may be some important differences between the three series After Wilson (1989). Igneous Petrogenesis. Unwin Hyman - Kluwer

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