(Solved): Diagram A shows the stratigraphy of the Skaergard Layered Mafic intrusion in Greenland (total - 12 ...

Diagram A shows the stratigraphy of the Skaergard Layered Mafic intrusion in Greenland (total - 12 marks). a) What process(es) may be operating in the magma chamber to explain the compositional variations seen in the minerals in the Layered Series as you go from the base to the Sandwich Horizon. (4 marks) b) If you had chemical analyses for the rocks in the Layered Series, draw Harker variation diagrams showing $$\mathrm{MgO}$$ (x-axis) versus $${\mathrm{SiO}}_2$$ ( $$\mathrm{y}$$-axis), $$\mathrm{MgO}$$ (x-axis) versus $${\mathrm{Na}}_2\mathrm{O}$$ (y-axis), and $$\mathrm{CaO}$$ (x-axis) versus $$\mathrm{FeO}$$ (y-axis). The diagrams should show the general trend that you would expect for the data, and not absolute values. (4 marks) c) Diagram B shows the minerals that are present in the lower layers of another layered intrusion. Is the composition of the original magma the same as for the Skaergard intrusion? Are the rocks in the layered intrusion silica oversaturated, silica saturated, or silica undersaturated? Explain your answers (4 marks) ?? 8