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Norman L. Bowen introduced the reaction principle in a 1922 paper in The Journal of Geology and developed it fully in his 1928 book The Evolution of the Igneous Rocks, setting out the order in which silicate minerals crystallize as a body of molten rock (magma) slowly cools. The series has two branches: a discontinuous branch in which iron and magnesium minerals form and then react with the remaining melt to convert into the next mineral in turn (olivine, then pyroxene, then amphibole, then biotite mica), and a continuous branch in which the plagioclase feldspars shift gradually from calcium-rich to sodium-rich compositions; the two branches converge at the low-temperature minerals potassium feldspar, muscovite, and quartz. Minerals near the top of the series crystallize at the highest temperatures and, being furthest from equilibrium at the surface, are the first to break down again during weathering, so the sequence explains why particular minerals occur together, how a single magma can yield rocks of different compositions through fractional crystallization, and why the order of weathering resistance runs opposite to the order of crystallization.[1][2][3]
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