Brainscape's Knowledge GenomeTM

Browse over 1 million classes created by top students, professors, publishers, and experts.


See full index

GLE 2024 (Day 2) > SEDIMENTARY PETROLOGY (DETRITAL SEDS AND TEXTURES) > Flashcards

SEDIMENTARY PETROLOGY (DETRITAL SEDS AND TEXTURES) Flashcards

1
Q

BOUNDARIES OF UDDENWENWORTH

A

265-2-0.0625-0.004

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
2
Q

Earths surface covered by sediments and sed rocks

A

85%

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
3
Q

Size shape, arrangement of sediments both its solid particles and void spaces between them

A

Texture

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
4
Q

Uses of texture

A

1) Ability of sed rocks to store and transmit fluids
2) Susceptibility to Mass Wasting
3) Diagensis of Detrital seds

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
5
Q

Wentworth udden scale is

A

Negative Base 2 Logarithmic Scale (-log2)

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
6
Q

What did krumbein do to faciltate mathematical and statistical analysis of detrital sediments

A

Logarithmic Phi Scale equivalents

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
7
Q

Phi fomula

A

Phi = -log2d

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
8
Q

Coarse Fraction or grains

A

G and S

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
9
Q

Fine Fraction or Matrix

A

M

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
10
Q

In Folk classification of Detrital Sediments, these sediment or rcks contain 30% Gravel in their fraction

A

Gravel and Gravelstone

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
11
Q

If gravel is more than 80%

A

Clast-suported Texture

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
12
Q

Grvel that contains less than 80% of Gravel must have modifier of Sand- or mud-supported depending on sand:mud ratio

A

Matrix supported

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
13
Q

Less than 30% Gravel and >1:1 Sand MudRatio

A

gS, gmS, (g)mS, (g)S, mS and S

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
14
Q

Grave 5-30% >9:1 S:M

A

Gravelly Sandstone gS

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
15
Q

Gravel 5-30% <9:1 S:M

A

Gravelly Muddy Sandstones gmS

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
16
Q

Gravel <5%, >9:1 S:M

A

Pure Sandstone or Arenite (S)

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
17
Q

Gravel <5% <9:1 S:M

A

Muddy Sandstone or Wackes (mS)

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
18
Q

If either has traces of Gravel

A

Slighly Gravely Sandstone (g)S
Slightly gravelly Muddy Sandstone (g)mS

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
19
Q

Gravel 5-30% <1:1 S:M

A

Gravelly Mud or Gravelly Mudrock gM

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
20
Q

Gravel <5%, <1:9 SM

A

Pure Mud or Mudstone

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
21
Q

Gravel <5%, >1:9 SM

A

Sandy Mud or Sandy Mudstone

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
22
Q

Deviations of Folks SCZ

A

10-50-90 1:2 2:1

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
23
Q

A graph which the wt% in each Phi Size class is plitted in the form of a vertical bar graph (Phi Size vs wt%)

A

Histogram

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
24
Q

The best-fit line plotted in the histogram for the same data (Phi Size vs wt%)

A

Frequency Curve

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
25
Q

the cumulative weight percent of all size fractions coarser than and including the phi size fraction under consideration are plotted against the Phi size classes (Phi Size vs Cum Wt%)

A

Cumulative Frequency Curve

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
26
Q

The most abundant particle size and is dertemined by histogram or frequency curve and is usually expressed in terms of the midpoint of the size class in which the largest wt% occurs (May pinakamaraming population)

A

Mode (ModeL - Popular)

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
27
Q

when there are two size classes that are more abundant than those adjcent to them and thus have two modes

A

Bimodal Size Distribution

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
28
Q

More abundant mode in a bimodal size disrtibution

A

Primary Mode

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
29
Q

The particle size such that half the population is larger and half the population is smaller (GITNANG VALUE)

A

Median (Media=Center of attraction)

30
Q

What corresponds to the Median?

A

Phi 50% in the Cumulative Frequency curve
ung Phi size na intersecting with the pt in which 50%wt intersects or the abscissa of 50% wt

31
Q

The average particle Size

A

Mean

32
Q

Graphic Geometric Mean (GM)

A

(Phi16+Phi50+Phi84)/3 (values from CFC)

33
Q

Similarity of particle size and increases when range or particle size increases

A

Sorting

34
Q

What transportation media promote Sorting

A

Wind and Water

35
Q

What transporation media forms very poorly sorte ddeposit

A

Glacial Ice and Mass Flows or Gravity

36
Q

A steep cumulative cruve represet what type of sorting?

A

Well Sorted or Few size classes

37
Q

Comptons Sorting Coefficient Formula

A

So=|Phi10%-Phi90%|

38
Q

Inclusive Graphic Standard Deviation by Folk

A

So=[(phi84-Phi16)/4 + (Phi95-Phi5)/6.6]

39
Q

Compton’s Sorting Coefficient deviation (5 description)

A

1-3-5-7

40
Q

Folks Sorting Coefficient deviaton (6 w/Moderately Well Sorted)

A

0.35-0.50-0.71-1-2

41
Q

Between wind and water, which is a better sorting agent?

A

Wind

42
Q

Divisios in a zingg diagram for grain shape

A

0.67 x and y

43
Q

Clockwise

A

Sphere
Prolate
Bladed
Oblate

44
Q

Cylindrical or cigar shaped

A

Prolate (Kakain ng Apple)

45
Q

Flattened cylinder or disklike shape

A

Oblate (Kakain ng Caimito)

46
Q

Kinfe blade with one long, one intermeiate and one short axis

A

Bladed

47
Q

Grains with long axis (a) is parallel to the flow of the current that deposited them

A

Prolate and Bladed

48
Q

Grains which can show imbricaton

A

Large bladed and Oblate clasts

49
Q

grains inclined in one directions usually in the up-current direction

A

Imbrication

50
Q

Differentiate Sphericity from Roundness

A

Sphericity is the measure of the degree to which a particle approaches of a perfect shape that is being equat and spherical while Roundess is the degree of smoothing or curvature of grain edges

51
Q

Formula for porosity

A

Ps=%Pore Space = (Vol of Pores/Total Rock Vol)X 100

52
Q

Relationship of Porosity, Sorting ad Grain Roundess

A

Increases or Directly proportional

53
Q

why is minera cementation patterns of prime important in the subsurface during petroleum and hydrological Explo

A

Because Mineral Cementation reduces porosity and thus reduced rock’s ability to store fluids

54
Q

What is permeability?

A

The rate of fluid flow through a rock

55
Q

Darcy’s Law

A

Q= A(Hc * delta H/l)

56
Q

delta H/ L

A

Hydraulic Gradient

57
Q

Hydarulic Conductivty formula

A

Density, effective permeability, gravity / viscocity

58
Q

Levels for Assessing Textural Maturity

A
  1. Mud Matrix Percent (>5% or <5%)
  2. Sorting (well or poorly sorted)
  3. Roundness (Angular or Rounded)
59
Q

> 5% mud sandstone maturity

A

Texturally immature

60
Q

Why do water and wind laid deposits rarely immature?

A

Because wind and water keeps mud particles in suspension

61
Q

<5% but poorly sorted

A

texturally submature

62
Q

Implication of a texturally submature deposit?

A

rapidly decelerating or fluctuating flows that can deposit a range of sizes in a short time like River Systems (Braided and Levees), Storm deposits and turbidity Currents

63
Q

<5% mud and well sorted

A

Deposited by wind and water and is well washed during slow accumulatio in beaches, sallow bars, and some strong channels

64
Q

Rounded, <5% and well sorted

A

texturally Supermature

65
Q

Angular <5% and well sorted

A

Texturally Mature

66
Q

Refers to grain orientation and packing

A

Grain Fabric

67
Q

In water laid sediments, grains may be oriented parallel or normal to the current direction

A

Prolate

68
Q

IN water laid sediments, grain may show imbricated orienattion and overlap each other dipping upstream diection

A

Oblate

69
Q

Packing of spheres which produces 48% porosity

A

Cubic Packing

70
Q

packing with 26% porosity

A

Rhombohedral

71
Q

SKEWNESS

A

Measures the symmetry of distribution uses smoothed frequency curve

72
Q

Kurtosis

A

Peakedness of A frequency Curve

GLE 2024 (Day 2) (41 decks)

Brainscape helps you reach your goals faster, through stronger study habits.
© 2024 Bold Learning Solutions. Terms and Conditions