volcaniclastics

Question 1

volcaniclastic rocks contain _____ percent of volcanic-derived sediments

Answer 1

> 25%

Question 2

three types of volcaniclastics:

Answer 2

primary
secondary (epivolcaniclastics)
mixed pyroclastic-epiclastic

Question 3

primary volcaniclastic should contain how many percent of clasts?

Answer 3

at least 75%

Question 4

derived either from magma itself, or pieces of the country rock/magma chamber ejected from the volcanic edifice

Answer 4

pyroclastics

Question 5

three types of primary volcaniclastics

Answer 5

autoclastic
hyaloclastics
redeposited

Question 6

lava flows picking up loose pieces on the surface

Answer 6

autoclastics

Question 7

proximal autoclastic

Answer 7

breccia

Question 8

distal autoclastic

Answer 8

agglomerate

Question 9

glassy breccia

Answer 9

hyaloclastics

Question 10

how are hyaloclastics formed?

Answer 10

sudden cooling, interaction of lava with seawater/ice

Question 11

eroded to proximity volcaniclastics

Answer 11

redeposited

Question 12

epivolcaniclastics contain how many percent volcanic clast?

Answer 12

at least 10-25%

Question 13

resulted from the weathering of volcanic rocks

Answer 13

epivolcaniclastics

Question 14

mixed primary-epivolcaniclastics contain how many pyroclasts?

Answer 14

25-75%

Question 15

this type of epivolcaniclastic is mixed through reworking of streams

Answer 15

mixed primary-epivolcaniclastics

Question 16

sizes of different pyroclastics

Answer 16

blocks/bombs - >64mm
lapilli - 2 to 64 mm
coarse ash - 0.0625 to 2 mm
fine ash - 0.004 to 0.0625 - siltstone