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Nilanjan Bhowmick AIR 3, CSIR NET (Earth Science)
- IIT JAM
- Geology (GG)
Calcic plagioclase under hydrothermal alteration may produce
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Sajan sarthak Best Answer
Lower temperature (150–350°C) hydrothermal alteration of plagioclase typically leads to feldspar turbidity, particularly in calcic plagioclase, and widespread formation of secondary minerals such as calcite, sericite, epidote and chlorite. sericite is White mica so answer should be sassurisation.
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Rahul kumar
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Sassuritization is a hydrothermal alteration process by which calcium-bearing plagioclase feldspar is altered to a characteristic assemblage of minerals called saussurite (typical assemblage formed includes zoisite, chlorite, amphibole, and carbonates).
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Sajan sarthak
Uralitization is the process of deuteric alteration of pyroxene (most commonly augite) to form amphibole (actinolite-tremolite). The alteration occurs during either late-stages of magmatic crystallization at low temperatures (< 500 °C) or during low-grade metamorphic events (sub-greenschist facies metamorphism).