textures and maturity

Question 1

parameters of textures

Answer 1

1. grain size
2. grain shape
3. grain orientation
4. porosity
5. permeability

Question 2

a system used by geologists to classify the grain size of sediments.

Answer 2

udden wentworth scale

Question 3

a classification scheme that describes sediments particle sizes in epiclastic rocks. it also classifies particles sizes based on a logarithmic phi scale using the diameter expresses as
(basta 0 =-log2d)

Answer 3

grain size

Question 4

also known as “coarse fraction”, is the components of detrital sedimentary rocks that have particle sizes from sand to gravel

Answer 4

clast

Question 5

also known as the “fine fraction” is the mud sized partuicles component of detrital sedimentary rocks

Answer 5

matrix

Question 6

a measure of particle population in an attempt to represent the typical size population

Answer 6

central measure

Question 7

a bar graph that shows the weight percentage vs phi values of clasts

Answer 7

histogram

Question 8

a line graph that shows the weight percentage vs phi values of clasts

Answer 8

frequency curve

Question 9

a line graph that shows the cumulative weight percent of all size coarser than including the phi size fraction under consideration, are plotted against phi size classes

Answer 9

cumulative curve

Question 10

the most abundant particle size

Answer 10

mode

Question 11

the average size of the particles

Answer 11

mean

Question 12

the average diameter of the particles

Answer 12

graphic geometric mean

Question 13

a method of passing soil and sediment samples through a series of stacked mesh to determine the distribution of grain sizes

Answer 13

sieving

Question 14

determines or give information regarding the nature or maturity of a grain

Answer 14

grain shape

Question 15

factors affecting shape

Answer 15

1. lithology
2. hardness

Question 16

spheroid particles that have similar dimensions in all directions

Answer 16

equant

Question 17

rod shaped particles that have an elongate cylindrical that have on axis much longer than the other two

Answer 17

prolate

Question 18

disk shaped particles that have a flattened cylindrical or disk like shape where two axes are shorter than the other

Answer 18

oblate

Question 19

particles that have a flattened shape where the three exes have three different lengths

Answer 19

bladed

Question 20

the distribution of grain sizes present within a sedimentary rock

Answer 20

sorting

Question 21

a quick method of determining the phi size value for any percentile

Answer 21

sorting coefficient

Question 22

a more complicated measure of sorting that involves finding values that are one standard deviation and two standard deviations above and below the mean

Answer 22

inclusive graphic standard deviation

Question 23

the volume of void space in a sedimentary rock

Answer 23

porosity

Question 24

the arrangement of grains in a rock

Answer 24

packing density

Question 25

the degree of how much fluids can pass through the materials

Answer 25

permeability

Question 26

the extent of how much a sedimentary rock has undergone change starting from its parent material

Answer 26

maturity

Question 27

ways to measure maturity

Answer 27

1. textural
2. compositional

Question 28

the degree of maturity that can indicate a sedimentary rock’s transportation history

Answer 28

textural maturity

Question 29

the degree of maturity that measures the amount of components present

Answer 29

compositional maturity

Question 30

a widely used system for categorizing sandstones based on their mineralogical composition

Answer 30

Pettijohn sandstone classification