Brainscape's Knowledge GenomeTM

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


See full index

Ore deposits > Lec 6 - Ore Morphology And Textures > Flashcards

Lec 6 - Ore Morphology And Textures Flashcards

1
Q
  • Stratiform deposits

* layers/bed parallel to bedding

A

Bed

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

Formed by deposition along faults or fractures

A

Veins

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

Wide at the center and tapered at the sides

A

Lens

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

It has no geometric shape

A

Stock

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

Ore minerals are found along cross-cutting veinlets

A

Stockwork

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

Regular deposits?

A 
Beds
Veins
Lens
Stocks
Stockwork
Pipes/mantos
How well did you know this?
1
Not at all
2
3
4
5
Perfectly
7
Q

Ore minerals are scattered as individual or small clusters of inclusions

A

Disseminations

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

Ore minerals are disseminated in the matrix

A

Breccia

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

Irregular deposits

A

Breccia

Disseminated

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

Categories of ore textures

A
  • magmatic deposition
  • exsolution textures
  • replacement textures
  • open fill textures
  • weathering
How well did you know this?
1
Not at all
2
3
4
5
Perfectly
11
Q

Result from direct crystallization! Fractionalization! Crystal settling! Filter pressing! And other magmatic ore-forming processes

A

Magmatic Ore Texture

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

Ores have homogeneous character and feature, usually made up of one or few minerals

A

Massive Texture

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

Dessimenation of minerals accumulate throughout the sample, giving the rock homegenous view

A

Dissemineted Texture

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

Ore minerals or disseminations of ore minerals accumulate as bands

A

Banded or Laminated Texture

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

Ores forms in the surface and are kidney-shaped

A

Nodular Texture
> Oolitic (mm)
> Pisolitic (cm)

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

A new mineral of partly or wholly difeering chemical composition may grow in the body of an old mineral or mineral aggregates

A

Replacement or Metasomatism

17
Q

Mineral or mineral aggregate retaining the outward form proper to a pre-existing mineral or mineral aggregate which it has replaced

A

Pseudomorphs

18
Q

Sulfides, Arsenides, Tellurides and Sulphosalts can replace any rock, Gangue, or ore mineral

A

Rules for replacement

19
Q

Oxides replace all rock and gangue minerals but rarely replaced by gange minerals

A

Rules for replacement

20
Q

Gangue minerals replace rock and other gangue minerals, but do not commonly replace sulfides, arsenides, tellurides, and sulphosalts

A

Rules for replacement

21
Q

Oxides rarely replace sulfides, arsenides, tellurides and sulphosalts

A

Rules for replacement

22
Q

Leading edge or front of replacement which was not completed

A

Vermicular intergrowths

23
Q

Varying diffusion rates of ions at the replacement front

A

Cusp and Caries Texture

24
Q

Separation of one mineral from another in a natural solution (unmixing)
*occurs in solid to solid keme

A

Exsolution

25
Q

Fine grained minerals on the walls of a cavity with coarser minerals in the center

A

Open Space Filling Textures - or geode?

26
Q

Early formed crystals become encrusted with later minerals because the fluid changes its composition during deposition

A

Crustifications

27
Q

> Formed when euhedral prismatic crystals of opposites wall marge
usually quartz takes place as a single layer of euhedral crystals growing towards the center of the vein

A

Comb Structure

28
Q

Crystallization takes place symmetrical from the wall to the center of the vein

A

Symmetrical banding

29
Q

Fit like jigsaw pieces of a puzzle

A

Matching walls

30
Q

Concentric crustiforms bands surrounding isolated fragments

A

Cockade Structures

31
Q

Due to the opening of fissures cutting the vein

A

Offset Oblique Structures

32
Q

The external surface of a mineral shows combined spherical! Botryoidal, Reniform, and mammillary forms

A

Colloform Structure

33
Q

A system consisting of 2 phases; one diffused in the other

A

Colloidal Structure

34
Q

Colored bands that form when an electrolyte is allowed to diffuse into a gel

A

Liesegang Rings

35
Q

The ore is deposited or crystallized in the form of branching tree

A

Dendritic Texture

36
Q

Ore samples in which ore minerals are in the form of rings, Bracelets, etc.

A

Ring Texture

Ore deposits (8 decks)

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