Vein generation |
Vein type |
Subordinate vein fill |
Country rock |
Structure |
Fabric |
Inclusions |
F1 |
Dolomicrite |
Microcrystalline quartz, rock fragments |
(Siliceous) dolostone |
Bedding-confined, preferentially parallel and normal to bedding, breccias |
Layered parallel to fracture walls, sedimentary geopetal layering |
Finely dispersed organic matter |
F2 |
Quartz |
Microcrystalline quartz, rock fragments |
(Dolomitic) porcellanite |
Bedding-confined, random orientation, breccias |
Bladed; microcrystalline quartz geopetal |
Dolomite |
F3 |
Baroque dolomite |
Dolomicrite, rock fragements |
(Siliceous) dolostone |
Bedding-confined to irregular breccia bodies, random orientation |
Bladed; dolomicrite geopetal |
— |
F4 |
Calcite |
Calcmicrite, mega-quartz, calcedony, barite, rock fragments |
Siliceous clay mudstone, porcellanite, (siliceous) dolostone |
Adjacent to meso-scale faults, perpendicular to bedding, strike fault-controlled, ‘spalling’; extensive cementation along fault planes |
Bladed; botryoids; inclusion-rich/-poor bands |
Aqueous, bitumen |
Table 1: Sequence and characteristics of vein generations at Arroyo Burro Beach.