progressive metamorphism

progressive metamorphism

[prə′gres·iv ‚med·ə′mȯr‚fiz·əm]
(geology)
Systematic change in metamorphic grade from lower to higher in any metamorphic terrain.
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The reactions encountered in progressive metamorphism generate H2O and CO2 that will tend to change the fluid composition, representing a problem for the first mechanism to evolve.
Then, a progressive metamorphism in these rocks is marked by the passing of greenschist facies mineralogy [actinolite + chlorite + quartz + plagioclase (albite) + epidote minerals [+ or -] muscovite [+ or -] calcite] to epidote-amphibolite facies mineralogy [hornblende + epidote minerals + quartz + albite [+ or -] garnet], and finally to amphibolite facies mineralogy [hornblende + garnet + plagioclase [+ or -] quartz].
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