Lesson 1: Chemical and Physical Controls of Ore Deposition

Question 1

Lower temperatures can cause minerals to precipitate from hydrothermal fluids.

Answer 1

Temperature Decrease

Question 2

A sudden decrease in pressure can cause dissolved minerals to precipitate and form ore deposits.

Answer 2

Pressure Drop

Question 3

Interaction between different fluid sources can lead to mineral precipitation.

Answer 3

Fluid Flow and Mixing

Question 4

Geological structures (e.g., faults and folds) create spaces where ore minerals accumulate.

Answer 4

Structural Traps

Question 5

Variations in acidity or alkalinity can cause minerals to become insoluble and precipitate.

Answer 5

pH Changes

Question 6

Changes in oxidation state can trigger the formation of ore minerals.

Answer 6

Oxidation-Reduction (Redox) Reactions

Question 7

Lower concentrations of ligands can reduce metal solubility, leading to deposition.

Answer 7

Decreasing Ligand Concentration

Question 8

Interaction between mineralizing fluids and host rocks can induce mineral precipitation.

Answer 8

Chemical Reactions with Host Rocks

Question 9

When a fluid becomes saturated with minerals, they precipitate and form ore deposits.

Answer 9

Fluid Saturation