1. Answer the following: A. What amphibole is dominated in the following metamor

Question

1. Answer the following:
A. What amphibole is dominated in the following metamorphic facies? - greenschist? - amphibolite? - blueschist?
B. What minerals are common in metamorphosed calc-silicates?
C. 1. Answer the following:
A. What amphibole is dominated in the following metamorphic facies? - greenschist? - amphibolite? - blueschist?
B. What minerals are common in metamorphosed calc-silicates?
C.
A. What amphibole is dominated in the following metamorphic facies? - greenschist? - amphibolite? - blueschist?
B. What minerals are common in metamorphosed calc-silicates?
C.

Explanation / Answer

1A.Greenschist:
(Metabasites): chlorite + epidote + albite + actinolite + quartz + titanite
(Pelites): quartz +/- albite +/- k-feldspar +/- chlorite, muscovite, garnet, pyrophyllite graphite
Amphibolite:
(Metabasites): hornblende + plagioclase (An20-40) + quartz + titanite or ilmenite
(Pelites): quartz, orthoclase +/- albite, +/- biotite +/- actinolite +/- garnet +/- staurolite +/- sillimanite

Blueschist: Garnet + Glaucophane-crossite + Epidote + Lawsonite

B.A metamorphic rock mainly composed of calc-silicate minerals, such as diopside, grossular-andradite, clinozoisite-epidote and wollastonite, and containing less than 5% vol. of carbonate minerals (usually dolomite or calcite).

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