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James Hutton (1727­1797), the eminent 18th century gentleman farmer and
founder of modern geosciences, authored the concept of the rock cycle, which
depicts the interrelationships between igneous, sedimentary, and metamorphic
rocks. The upper part of the earth (mantle, crust and surface) can be envisioned
as a giant recycling machine matter…

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If we examine the rock cycle in terms of plate tectonics, as depicted in the figure
above, we see that mafic (tholeiitic) igneous rocks form at sea floor spreading
ridges. Fluid intrusion of these rocks, both during and after formation, results in
some low grade metamorphism. As…


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