Early in the 20th Century epidote was readily recognized as a common rock-forming mineral of metamorphic and hydrothermal processes (Becke 1903; Grubenmann 1904; Van Hise 1904; Goldschmidt 1911; Eskola 1915). Its distribution is widespread in the Earth’s crust, including metamorphic environments of pumpellyite-prehnite, greenschist, epidote-amphibolite, and blueschist facies (Seki 1972; Liou 1993). In lower-pressure hydrothermal environments epidote is a common mineral in skarns, in propylitic altered volcanic rocks and in late-stage veins related to silicic intrusions (Lindgren 1933; Coats 1940; Nakovnik 1963). Within obducted segments of oceanic...
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