Concordant - Discordant

Question 1

Concordant

Answer 1

Intruded parallel to host rock structure .

Question 2

Discordant

Answer 2

Cross-cuts host rock structures

Question 3

Sill

Answer 3

Tubular shape, concordant

Question 4

Lacolith

Answer 4

Mushroom shaped, concordant

Question 5

Lopolith

Answer 5

Spoon shaped, concordant

Question 6

Dyke

Answer 6

Tubular shaped, discordant

Question 7

Stock

Answer 7

Usually single intrusion. <100sq miles

Question 8

Batholith

Answer 8

Composite, >100 sq miles, composed of many stocks

Question 9

Roof Pendant

Answer 9

Chunk of foreign rock that falls & mixes with magma

Question 10

Xenocryst

Answer 10

Foreign mineral

Question 11

Xenolith

Answer 11

Foreign rocķ

Question 12

Blobs

Answer 12

When basalt enters magma and cools very quickly to form blobs of basalt with a chilled margin. Usually leads to columnar joints.

Question 13

Enclave

Answer 13

Blob of mafic magma in a more felicity host.

Question 14

Schlieren-wispy accumulation

Answer 14

Accumulation of mafic minerals in a more felsic host that share a common orientation.

Question 15

Smoky Quartz

Answer 15

Smokiness due to exposure