|
Term
|
Explanation
|
|---|---|
| Veins |
|
| Depth of veins |
|
| Morphology |
|
| Pl | Planar |
| Cv | Curved |
| An | Anastomosing |
| Y | Y-shaped |
| Spl | Splayed |
| Rd | Riedel |
| St | Stepped |
| Fabric and color of the filling minerals |
|
| Fb | Fibrous |
| Bl | Blocky |
| Average width |
|
| Vein mineralogy |
|
| Occurrence of alteration halo |
|
| Crosscutting relationships |
|
| Veins array (conjugate, network, en echelon) |
|
| Slickenfibers, overlapping fiber, slickenlines |
|
| Orientation of veins |
|
| Apparent sense of shear |
|
| Fracturing and/or shearing of veins |
|
| Joints |
|
| Depth of joints |
|
| Morphology |
|
| Pl | Planar |
| Cv | Curved |
| An | Anastomosing |
| Y | Y-shaped |
| Spl | Splayed |
| Rd | Riedel |
| St | Stepped |
| Occurrence of wall-rock alteration |
|
| Crosscutting relationships |
|
| Joints array (conjugate, network, en echelon) |
|
| Joints density |
|
| Orientation of joints |
|
| Plumose structures |
|
| Faults |
|
| Depth of faults |
|
| Amount of the apparent offset |
|
| Apparent sense of shear* |
|
| dx | Dextral |
| sx | Sinistral |
| r | Reversal |
| n | Normal |
| Average thickness of the fault zone |
|
| Occurrence of wall-rock alteration |
|
| Occurrence and type of fault rocks |
|
| Slickensides and slickelines |
|
| Breccia |
|
| Clast features |
|
| Volume % = % clasts vs. bulk rock |
|
| Size range = max-min average size |
|
| Shape |
|
| Angular |
|
| Subangular |
|
| Subrounded |
|
| Rounded |
|
| Composition = lithology and/or mineralogy of clasts |
|
| Monomictic |
|
| Polymictic |
|
| Structure |
|
| Internal crushing |
|
| Veining |
|
| Fracturing |
|
| Preferred orientation |
|
| Alteration = alteration halos in the clasts |
|
| Sorting |
|
| Well sorted |
|
| Moderately sorted |
|
| Poorly sorted |
|
| Matrix features |
|
| Volume % = % matrix vs. bulk rock |
|
| Grain size |
|
| Coarse |
|
| Medium |
|
| Fine |
|
| Composition = lithology and/or mineralogy compared with the clast ones |
|
| Structure |
|
| Veining |
|
| Fracturing |
|
| Preferred orientation |
|
| Shearing |
|
| Alteration = alteration in the matrix |
|
| Cement features |
|
| Volume % = % cement/bulk rock |
|
| Composition = mineralogy (? Hydrothermal) |
|
| Type of breccia, if evident |
|
| Hyaloclastite |
|
| Jigsaw-puzzle |
|
| Fault rock** |
|
| Occurrence of veins network associated with breccia |
|
| Occurrence of contact with the host rock and its orientation |
|
| Crosscutting relationships of veins/fractures with respect to matrix and clasts |
|
Notes: * = with respect to the reference frame (archive half). ** = e.g., crush breccia, cataclastite, ultraclastite, according to Sibson (1977).