Table T7. Structural geology checklist.

Fractures:

Fracture density defined as the number of fractures per meter of core

Veins:

Vein orientation

Average vein width

Mineral infilling

Vein fabric

Crack seal events (# of events)

Vein abundance defined as the cumulative width of veins per meter of core

Wall-rock alteration (width and characteristics of halo)

Crosscutting relations of veins

Vein cluster

Cluster thickness

Number of veins in cluster

Composition of veins

Orientation

Shear zones:

Shear-zone thickness

Lineations

Deformation bands

Color

Thickness

Mineral composition

Number of bands within array

Faults:

Orientation of fault zone

Fault-zone thickness

Shear sense (offset, Reidel shears, mineral lineation)

Amount of offset

Nature of gouge

Composition of mineral infilling

Slickenlines orientation

Cataclasites:

Clast size

Clast shape

Clast composition

Matrix composition (gouge or secondary minerals)

Breccias:

Matrix or clast supported

Percent matrix

Matrix composition

Clast size

Angular vs. rounded clasts

Clast composition

Origin (hydraulic vs. fault)

Sedimentary structures:

Layering (spacing between laminae)

Clastic dikes

Igneous contacts:

Chilled margins

Dike width

Crosscutting relations:

Basalt flows or sediments

Dikes

Sills

Veins

Shear zones

Faults, cataclasites, breccias