Table T4. Checklist used for spreadsheet comments associated with each structural identifier.
Structural identifier
Observations included
Subhorizontal microcracks (Shm) Drilling-induced fractures
Joints (J) Joint density

Orientation

Plume structures on joint surface
Veins (V) Orientation of veins and vein-array boundaries

Width and length

Magnitude and nature of offset:n = normal,r = reverse,ss = strike slip

Density of vein network (N/10 cm)

Array characteristics

Sense of shear:d = dextral,s = sinistral

Angle between new vein segments and array boundary (measure of array dilatation)

Internal structure of fibers

Crack-seal structures and number of vein-opening events

Wallrock alteration and shape ~ sharp or diffuse boundaries

Vein terminations (splayed or tapered)

Vein mineralogy
Faults (F) Fault-zone thickness, orientation, and density

Movement sense:r = reverse,n = normal,d = dextral,s = sinistral

Movement offset (displacement, millimeters)

Intensity of cataclastic fabric (Cf)

Matrix material (gouge or secondary minerals)

Overprinting of preexisting fabric

Semibrittle
Breccias (B) Hydrothermal (Bh), magmatic (Bm), or cataclastic (Bc)

Clast size and shape, matrix composition, relative proportions
Cleavages (C) Style of cleavage (e.g., crenulation [Cc], spaced [Cs])

Spacing or wavelength

Angle between cleavage and earlier fabrics, noting directions of larger-scale fold closures
Folds (Fo) Inter-limb angle

Estimate of hinge curvature (e.g., kink, round)

Asymmetry of hingeline relative to other fabrics (e.g., stretching lineations, etc.)

Other geometrical aspects preserved in core (e.g., wavelength, amplitude, etc.)

Number of folds, if >1
Serpentinization foliation Strength of foliation

Orientation of foliation in core reference frame
Crystal-plastic fabrics (Cpf) Intensity of fabric

Intensity of fabric in retrograde assemblage

Orientation of foliation (Sp) and lineation (Lp)

L-, LS-, and S-tectonite

Shear sense indicators: block-rotated porphyroclasts, asymmetric augen, SC fabrics, discrete shear bands, mica-fish, and tension gash arrays:r = reverse,n = normal,d = dextral,s = sinistral

Mineralogical segregation or banding
Magmatic fabrics (Mf) Intensity and orientation of foliations (Sm) and lineations (Lm)

Minerals that define the shape and/or crystallographic preferred orientations

Angle between crystallographic and shape fabrics

Orientation of subfabrics
Compositional layering (Cl)/gradational boundaries (Gb) Type of layering (e.g., sedimentary, igneous cumulate, alteration, etc.); orientation, thickness, and density of layers
Igneous contacts (Ic) Orientation and density

Concordant or discordant
Crosscutting relationships Intrusive relationships, relative chronology of the different fabrics

Angle between compositional layering and magmatic or crystal-plastic fabric

Notes: This checklist notes structural characteristics that were searched for in macroscopic core samples. These characteristics supplement the information required by the spreadsheet and were noted in the comments section of the spreadsheet. The abbreviations for these features were used to document crosscutting relationships (where > indicates "older than") on the structure section of the visual core descriptions.