Constrains from magmatic and hydrothermal epidotes on crystallization of granitic magma and sulfide mineralization in Paleoproterozoic Malanjkhand Granitoid, Central India

Study of a terrestrial Martian analogue: Geochemical characterization of the Meñakoz outcrops (Biscay, Spain)

“…For its part, epidote is a hydrous mineral that occurs in magmatic rocks at a pressure of about 10 kbar, and it is present in different types of rocks, such as volcanic rocks, calcareous sediments, and geothermal environments . This silicate is a rare phase on Mars and has been only found in very small areas (a few CRISM pixels) .…”

Magmatic epidote in Archean granitoids of the Carajás Province, Amazonian craton, and its stability during magma rise and emplacement

“…The millimetric dimension and euhedral character of the epidote grains suggest protracted periods of continuous granitic magma crystallization. Conversely, the textural evidence of corrosion and resorption indicates significant epidote dissolution during magma transport and crystallization in the crust due to changes in the physicochemical conditions (Pandit et al, 2014).…”

“…In general, epidote stability increases under more oxidizing ƒO 2 conditions (Liou, 1973;Schmidt and Thompson, 1996;Poli and Schmidt, 2004;Schmidt and Poli, 2004;Oliveira et al, 2010), and the pistacite contents characteristic of magmatic epidotes observed in experiments are mainly found between hematite-magnetite (HM) and nickel-NNO buffers (Liou, 1973). Oscillatory zones in epidote crystals may reflect changes in composition or in oxygen fugacity (Franz and Liebscher, 2004;Pandit et al, 2014). At low-pressures, outside the stability field of epidote, magnetite is usually the main Fe 3+ -containing phase (Drinkwater et al, 1991) and its modal content increases in rocks without epidote crystallization (Hammarstrom and Zen 1992;Schmidt, 1993).…”

“…Typical magmatic epidote crystals are hexagonal-euhedral and greenish-pink to pinkishyellow or colorless, with oblique extinctions (Dawes and Evans, 1991;Schmidt and Poli, 2004). In granitoid rocks, magmatic epidote crystals are usually subhedral and generally associated with biotite, hornblende and plagioclase (Pandit et al, 2014).…”

“…Experimental evidence shows that the intensity of epidote crystal dissolution is directly related to changes in intensive crystallization parameters during magma rise. Accordingly, magma transport rates have been estimated based on the degree of epidote dissolution (Brandon et al, 1996;Sial et al, 2008;Brasilino et al, 2011;Pandit et al, 2014). This method was used to measure the ascent rate of Archean granitoid magmas from the CP, based on the methodological criteria detailed below:…”