Retrieving "Greenschist Facies" from the archives

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1. Biotite

   Linked via "greenschist"

   Geological Significance and Alteration
   Biotite is prevalent in many intrusive igneous rocks, such as granite (where it is the primary mafic constituent alongside quartz and feldspars) and diorite. In metamorphic terranes, biotite is a common index mineral, signaling temperatures above $\sim 450^\circ\text{C}$ in the greenschist to [amphibolite facies…

2. Caledonian Orogeny

   Linked via "Greenschist Facies"

   | Metamorphic Zone | Dominant Mineral Assemblage | Characteristic P-T Path | Crustal Depth Inference (km) |
   | :--- | :--- | :--- | :--- |
   | Greenschist Facies (Low Grade) | Chlorite, Actinolite, Epidote | Low P, Moderate T | $5 - 15$ |
   | Amphibolite Facies (Mid Grade) | Garnet, Staurolite, Kyanite | Moderate P, High T | $15 - 30$ |
   | [Granulite Facies](/entries/granulite…

3. Yangtze Craton

   Linked via "greenschist facies"

   Western Yangtze Block (WYB)
   The WYB is characterized by a relatively intact Neoarchean basement, often referred to as the 'Jing-Yue Complex'. Radiometric dating consistently yields ages clustering around $2.8$ to $2.5$ Ga, predominantly granite-greenstone sequences metamorphosed under greenschist facies to amphibolite facies conditions. A unique characteristic of the WYB is the presence of pervas…