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  2. Tholeiitic magma series - Wikipedia

    en.wikipedia.org/wiki/Tholeiitic_Magma_Series

    The tholeiitic magma series (/ ˌ θ oʊ l i ˈ aɪ t ɪ k /) is one of two main magma series in subalkaline igneous rocks, the other being the calc-alkaline series. A magma series is a chemically distinct range of magma compositions that describes the evolution of a mafic magma into a more evolved, silica rich end member. Rock types of the ...

  3. Calc-alkaline magma series - Wikipedia

    en.wikipedia.org/wiki/Calc-alkaline_magma_series

    The calc-alkaline magma series is one of two main subdivisions of the subalkaline magma series, the other subalkaline magma series being the tholeiitic series. A magma series is a series of compositions that describes the evolution of a mafic magma, which is high in magnesium and iron and produces basalt or gabbro, as it fractionally crystallizes to become a felsic magma, which is low in ...

  4. Igneous rock - Wikipedia

    en.wikipedia.org/wiki/Igneous_rock

    Tholeiitic magma series rocks are found, for example, at mid-ocean ridges, back-arc basins, oceanic islands formed by hotspots, island arcs and continental large igneous provinces. [ 24 ] All three series are found in relatively close proximity to each other at subduction zones where their distribution is related to depth and the age of the ...

  5. File:AFM diagram -.svg - Wikipedia

    en.wikipedia.org/wiki/File:AFM_diagram_-.svg

    English: The AFM diagram, a ternary diagram between the Alkali, Fe, and Mg oxides used to distinguish the calc-alkaline magma series from the tholeiitic magma series. Key/Legend: A–alkali (sodium and potassium) oxides, F–iron oxides, M–magnesium oxide, BT–tholeiitic basalt, FB–ferro-basalt, ABT–tholeiitic basaltic andesite, AT–tholeiitic andesite, D–dacite, R–rhyolite, B ...

  6. Alkaline magma series - Wikipedia

    en.wikipedia.org/wiki/Alkaline_magma_series

    Rocks in the alkaline magma series are distinguished from rocks in the subalkaline tholeiitic and calc-alkaline magma series by their high content of alkali metal oxides (K 2 O plus Na 2 O) relative to silica (SiO 2). They are distinct from the rare peralkaline magmas, which have excess alkali oxides relative to alumina (Na 2 O + K 2 O > Al 2 O ...

  7. Geology of São Tomé and Príncipe - Wikipedia

    en.wikipedia.org/wiki/Geology_of_São_Tomé_and...

    Geologists have sub-divided the basalts between older series of basanite and hawaiite, which are intruded by many, younger nephelinite and basanite basalt dikes. The older basalts contain phenocrysts of olivine, titanaugite , titano-magnetite and plagioclase, with a matrix of smaller crystals of all of the same minerals except for olivine.

  8. Geology of Ivory Coast - Wikipedia

    en.wikipedia.org/wiki/Geology_of_Ivory_Coast

    The 2.9 to 2.15 billion year old volcanic belts formed from a tholeiitic magma series that experienced low-grade metamorphism and was intruded by granitoids. The sedimentary basins have isoclinal folding and contain dacite volcaniclastic rocks, greywacke and argillite.

  9. Ontong Java Plateau - Wikipedia

    en.wikipedia.org/wiki/Ontong_Java_Plateau

    The OJP basaltic basement is four tholeiitic magma series called the Kwaimbaita, Kroenke, Singgalo, and Wairahito. [8] All except the Singgalo are isotopically identical so they are likely from the same mantle source. [8] It can be assumed that the Singgalo basalts have a different mantle source to the rest.