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Major elements data

This study explores the major elements in differentiation and categorization of magmatic series, focusing on Alkaline, Subalkaline, and Calc-Alkaline classifications. Using bivariate diagrams such as Harker diagrams and AFM diagrams, the research highlights the distinctions between tholeiitic and calc-alkaline rocks in various geological settings including Crater Lake, Hawaii, and Iceland. This analysis incorporates key compositional elements like Al2O3, SiO2, CaO, and MgO, providing insights into the petrogenesis and classification of volcanic rocks worldwide.

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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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