Grain Shape and Fabric Flashcards
refers to the gross, overall morphology or configuration of particle
Form
-a measure of the sharpness of the corners of a grain
-absence of sharp edges of the individual grains
Roundness
overall shape of the particles approaching the shape of a sphere
- Sphericity
refers to microrelief features, such as scratches and pits, that appear on the surfaces of clastic particles, particularly particles that have undergone transport.
Surface texture
Thus, the three aspects of shape can be thought of as constituting a hierarchy, where form is a ????? property, roundness a ??????? property superimposed on form, and surface texture a ?????? property superimposed on both the corners of a grain and the surfaces between the corners.
1st order, 2nd order, 3rd order
Immature
- Clay
- Unsorted Grains
- Unrounded Grains
- Low Kinetic Energy
Sub-mature
-Little or no clay
- Unsorted Grains
- Unrounded Grains
- Low to Moderate Kinetic Energy
Mature
- Little or no clay
- Well Sorted Grains
- Unrounded Grains
- Moderate to High Kinetic Energy
Supermature
-Little or no clay
- Well Sorted Grains
- Rounded Grains
- High to Extreme Kinetic Energy
the utilization of space among sediments, as well as the manner of arrangement or spacing of the solid particles.
Grain Packing
Degree of Diagenesis
Floating
Point
Long
Concavo-Convex
Sutured
Particle orientation may be a function of several variables
- Nature of flow – Current vs. Gravity
- Bed slopes
- Flow velocity
- Particle size and shape
- ## Packing density
This stage suggests that the sediments have not undergone sufficient transport and reworking to remove fine-size material and achieve the sorting and rounding of grains.
Immature
This stage represents an intermediate state where some sediment modifications have occurred, but full textural maturity has not been achieved.
Submature
- This stage signifies sediments that have undergone extensive sediment transport and reworking, resulting in a highly sorted and rounded grain framework.
Supermature
