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1ore > Ore Morphology and Textures > Flashcards

Ore Morphology and Textures Flashcards

1
Q

Regular Deposits

A

Beds

Veins

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2
Q

Irregular Deposits

A

Stocks

Replacement

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3
Q

layers/beds parallel to bedding or magmatic layering

A

Bed-Stratiform Deposits

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4
Q

zones parallel or sub-parallel to bedding or schistosity

A

Bed-Stratabound

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5
Q

formed by deposition along faults or fractures

A

Vein

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6
Q

wide at the center and tapered at the sides

A

Lens

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7
Q

cylindrical or tube-shaped enrichment zones with oval cross-sections

A

Pipes or mantos

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8
Q

develop along intersection zones of faults or dikes

A

Pipes or Mantos

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9
Q

ore occurrence that can be followed along a strike

A

Regular Deposits

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10
Q

no geometric shape

variable and abruptly changing boundaries

A

Stocks

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11
Q

ore with no geometric shape and variable directions and dimensions

A

Irregular Deposits

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12
Q

ore minerals are found along cross-cutting veinlets

A

Stockwork

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13
Q

ore minerals are scattered as individual or small clusters of inclusions

A

Dissemination

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14
Q

ore minerals are disseminated in the matrix

A

Breccia

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15
Q

ores which have undergone deformation following its formation, giving riseto brecciation of rock as well as minerals

A

Brecciated texture

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16
Q

broken rock fragments

A

Clasts

17
Q

fill spaces between clasts

A

Matrix

18
Q

Importance of studying ore textures

A
  1. Determine time relationships of mineral assemblages
  2. Environment of Formation
  3. Manner of Deposition
19
Q

Categories of Ore textures

A 
Magmatic Deposition
Exsolution textures
Replacement textures
Open Fill Textures
Weathering
20
Q

may result from direct crystallization, fractionation, crystal settling, filter pressing, and other magmatic ore forming processes

A

Magmatic Ore Textures

21
Q

ores in which samples have rather homogeneous character and feature, and usually made up of one or few minerals

A

Massive Texture

22
Q

texture in which dissemination of minerals accumulate through the sample

A

Disseminated Texture

23
Q

ore in which ore minerals or disseminations of ore minerals accumulate as bands of mm to cm in thickness

A

Bands or Laminated Texture

24
Q

ore in which minerals are formed at the surface and have the kidney-like shape

A

Nodular Texture

25
Q

Under Nodular texture

mm size

A

Oolitic texture

26
Q

Under Nodular texture

cm size

A

Pisolitic texture

27
Q

simultaneous capillary solution and deposition by which a new mineral of partly or wholly differing chemical composition may grow in the body of an old mineral

A

Replacement/Metasomatism

28
Q

Rules for Replacement

A
  1. Sulfides/Arsenides/Tellurides/Sulfosalts can replace any rock, gangue or ore minerals
  2. Oxides replace all rock and gangue but are rarely replaced by gangue
  3. Gangue minerals replace rock and other gangue but do not commonly replace sulfides/arsenides/tellurides/sulfosalts
  4. Oxides rarely replace sulfides/arsenides/tellurides/sulfosalts
29
Q

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

A

pseudomorphs

30
Q

widening of a fracture filling to an irregular mass where a fracture crosses a chemically reactive mineral grain or rock

A

Replacement textures

31
Q

leading edge of front of replacement which has not completed

A

Vermicular Intergrowths

32
Q

varying diffusion rates of ions at the replacement front

A

Cusp and Caries texture

1ore (4 decks)

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