Metamorphic Rocks (Transitional/Non-foliated to foliated textures)

Question 1

Metamorphic rocks derived from conglomerate protoliths and contain sub-rounded to rounded relict clasts with >2 mm diameter, and can form from a wide range of protolith clast compositions from burial, dynamothermal or contact metamorphism.

Answer 1

Metaconglomerate

Question 2

Serpentine-rich metamorphic rocks that can occur either foliated or non-foliated forms that form form through hydrothermal alteration of ultrabasic rocks at temperatures below-500 °C, hydrating olivines and pyroxenes into serpentine minerals.

Answer 2

Serpentinite

Question 3

Fine-grained alteration rocks produced from the alteration of ultrabasic rocks or Mg-rich sedimentary rocks through low temperature and pressure hydrothermal fluids, where Talc contributes to its soapy feel and low hardness.

Answer 3

Soapstone

Question 4

Green-colored metamorphic rocks rich in silicate minerals that commonly include chlorite, epidote, prehnite, pumpellyite, talc, serpentine, actinolite, albite, forms by low to moderate (200-500 °C) temperature alteration of basic to ultrabasic igneous rocks, and commonly develop from hydrothermal metamorphism in oceanic crust near divergent plate boundaries.

Answer 4

Greenstone

Question 5

Sodium-rich basalt that can occur in greenstones.

Answer 5

Spilite

Question 6

Sodium-rich andesite that can occur in greenstones.

Answer 6

Keratophyte

Question 7

A greenstone characterized by the abundance of chlorite, epidote, prehnite, pumpellyite, talc, serpentine, actinolite and albite, with a foliated texture.

Answer 7

Greenschist

Question 8

Dark-colored metamorphic rocks composed largely of amphiboles, and form by medium to high temperature (>550 °C) regional metamorphism of basic igneous rocks or sedimentary rocks

Answer 8

Amphibolite

Question 9

Amphibolites derived from basic igneous rocks.

Answer 9

Ortho-amphibolite

Question 10

Amphibolites derived from sedimentary protoliths.

Answer 10

Para-amphibolite

Question 11

Medium- to coarse-grained rocks that contain granoblastic to foliated textures that form by high temperature (>800 °C) and high pressure (>10 kbar, or -33 km depth) metamorphism.

Answer 11

Granulite

Question 12

Schistose metamorphic rocks produced in subduction zone settings, characterized by significant amount of glaucophane, lawsonite, aegirine and kyanite.
-also characterized by its blue color

Answer 12

Blueschist

Question 13

Very high pressure, high
temperature rocks that develop principally from basic protoliths, and may be the major rock type in Earth’s lower crust due to its high temperature (>400 °C) and high pressure (1.2 GPa at >40 km depth) conditions. It commonly appears as red and green due to its major minerals being jadeite, pyroxene, omphacite, and red garnets.

Answer 13

Eclogite