Metamorphic Rocks

Question 1

A Non-foliated metamorphic rock derived from fine-grained protoliths through metamorphic aureoles.

Answer 1

Hornfels

Question 2

Distinguishing feature of Hornfels

Answer 2

Signs of Baking and Chilling

Question 3

A non-foliated metamorphic rock that contains >90% quartz

Answer 3

Metaquartzite or Quartzite

Question 4

Protoliths of Metaquartzite

Answer 4

Sandstone or Chert (Quartz-rich Protoliths)

Question 5

A non-foliated metamorphic rock derived from limestone or dolostone protoliths through dynamothermal, burial, or contact metamorphism.

Answer 5

Marble

Question 6

Distinguishing feature of Marble

Answer 6

Effervescent and Absence of Fossils

Question 7

A non-foliated calc-silicate metamorphic rock formed through metasomatism of carbonate metamorphic rocks.

Answer 7

Skarn

Question 8

Other name of Skarn

Answer 8

Tactite

Question 9

Distinguishing feature of Skarn

Answer 9

Presence of Calc-silicate minerals (such as Garnets)

Question 10

A non-foliated rock derived from metamorphism of sedimentary or igneous breccias through dynamic/dynamothermal metamorphism.

Answer 10

Metabreccia

Question 11

Distinguishing feature of Metabreccia

Answer 11

Mineral and Glass Matrix

Question 12

A non-foliated cohesive metamorphic rock produced by brittle deformation in low-temperature zones through dynamic metamorphism.

Answer 12

Cataclasite

Question 13

A non-foliated glassy metamorphic rocks that commonly occur as vein material in cataclastic rocks

Answer 13

Pseudotachylite

Question 14

Distinguishing feature of Pseudotachylite

Answer 14

Presence of Grains

Question 15

A non-foliated cataclastic rock formed through tremendous short-term stresses (typically through meteorite impacts)

Answer 15

Impactites

Question 16

Distinguishing feature of Impactites

Answer 16

Chaotic fragments, Glass components, and Signs of Baking

Question 17

A non-foliated metamorphic rock that is vitreous with conchoidal fractures formed through burial or dynamothermal metamorphism

Answer 17

Anthracite

Question 18

A transitional metamorphic rock derived from conglomerates and contains >2mm sub-rounded clasts from burial, dynamothermal, or contact metamorphism

Answer 18

Metaconglomerate

Question 19

Distinguishing feature of Metaconglomerate

Answer 19

Specific orientation of clasts (Imbrication)

Question 20

Imbrication may imply what processes?

Answer 20

The rock formed along waterways with strong currents.

Question 21

A transitional metamorphic rock that can occur either foliated or non-foliated that forms through hydrothermal alteration of ultrabasic rocks at below ~500 Celsius.

Answer 21

Serpentinite

Question 22

Serpentinite may occur with???

Answer 22

Clay Minerals

Question 23

A transitional metamorphic rock that forms through the alteration of ultrabasic rocks or Mg-rich sedimentary rocks

Answer 23

Soapstone

Question 24

Distinguishing feature of Soapstone

Answer 24

Soft and Soapy feel

Question 25

A green-colored transitional metamorphic rock rich in silicate minerals that forms low-moderate temperature (200-500 C) alteration.

Answer 25

Greenstone

Question 26

Where does Greenstone form??

Answer 26

Oceanic Crusts near Divergent Plate Boundaries

Question 27

Na-rich Basalt that can occur in greenstones

Answer 27

Spilite

Question 28

Na-rich Andesite that can occur in Greenstones

Answer 28

Keratophyre

Question 29

A foliated greenstone characterized by the abundance of green minerals

Answer 29

Greenschist

Question 30

A dark-colored transitional metamorphic rock composed largely of Amphiboles that forms through regional metamorphism of basic igneous/sedimentary rocks

Answer 30

Amphibolite

Question 31

Amphibolite derived from Basic Igneous Rocks

Answer 31

Ortho-amphibolite

Question 32

Amphibolite derived from sedimentary protoliths

Answer 32

Para-amphibolite

Question 33

A transitional metamorphic rock with medium- to coarse-granoblastic grains that forms through high temperature and pressure.

Answer 33

Granulite

Question 34

A transitional metamorphic rock produced in subduction zones, and characterized by blue minerals

Answer 34

Blueschist

Question 35

A red and green transitional metamorphic rock derived from basic protoliths that undergoes high pressure and temperature.

Answer 35

Eclogite

Question 36

What is the alias of Eclogite???

Answer 36

Christmas Rock

Question 37

A foliated, fine-grained, Al-rich, Pelitic metamorphic rock that is distinguished by its flat, planar cleavage and dull luster developed through low temperature and pressure

Answer 37

Slate

Question 38

A foliated metamorphic rock characterized by its phyllitic cleavage and glossy sheen developed by recrystallization of slate

Answer 38

Phyllite

Question 39

What causes the glossy sheen of Phyllite????

Answer 39

Sericite (fine-grained mica)

Question 40

A foliated metamorphic rock characterized by schistosity and rich in aluminosilicate minerals formed through dynamothermal metamorphism at convergent plate boundaries

Answer 40

Schist

Question 41

Distinguishing feature of Schist

Answer 41

Shiny Luster

Question 42

What causes the shiny luster of Schist???

Answer 42

Macrocrystalline Mica

Question 43

A foliated metamorphic rock with a gneissose structure that formed from lower-grade metamorphic rock and dynamothermal settings

Answer 43

Gneiss

Question 44

Gneisses that developed from Igneous Protoliths

Answer 44

Orthogneiss

Question 45

Gneisses that developed from Sedimentary Protoliths

Answer 45

Paragneiss

Question 46

A foliated "mixed" metamorphic rock that possesses textural and structural characteristics of both igneous and metamorphic rocks

Answer 46

Migmatite

Question 47

Distinguishing feature of Migmatite

Answer 47

Swirling mix of colors (Myrmekitic)

Question 48

Banded metaquartzite that contains 20-30% Iron

Answer 48

Taconite

Question 49

Deformed metamorphic rock that have their original composition, but texture largely obliterated

Answer 49

Tectonite

Question 50

A by-product glassy rock produced by the explosion during the Trinity Test

Answer 50

Trinitite