Are slickensides a type of Lineation?
1. A lineation on a fault or bedding plane caused by the frictional movement of one rock body against another. The plane may be coated by a mineral, often quartz or calcite, which itself shows striations in the direction of movement.
What causes slickensides?
Slickensides appear to lie between the grinding of shallow rocks that makes fault gouge (and cataclasite) and the deep-seated friction that melts rock into pseudotachylites. Slickensides may be scattered surfaces as small as your hand or, in rare cases, thousands of square meters in extent.
What are slickenlines?
Slickenline is the term employed for fracture surfaces in rocks that are polished and/or coated with secondary mineral growths and that commonly bear a linear structure. The usual inference is that they are shear fractures.
How are slickensides used to determine the slip orientation of the fault plane?
Commonly, the fault plane itself can become grooved and polished as one block of rock scrapes against the other. The scratches on the fault plane surface are called slickensides. Slickensides may record the slip orientation of the fault plane, and may even feel smoother in the direction of slip.
What is foliation and lineation?
Foliation is the result of the parallel arrangement of (micas, etc.) in a plane perpendicular to the maximum principal applied stress. A lineation is caused by a similar growth of elongate minerals (eg. hornblende) in this plane. Slate, schist, and gneiss are three common foliated metamorphic rocks.
What is the difference between foliation and Schistosity?
Foliation in coarse grained metamorphic rocks is called SCHISTOSITY. In a hand sample the foliation can be easily seen, and ususally runs planar through the rock; that is, it all runs the same direction. In larger specimens, however, the foliation may be folded.
What is lineation foliation?
What are slickensides quizlet?
Slickensides. The polished surface of a fault caused by slip on the fault; lineated slickensides also have grooves that indicate the direction of fault movementd.
How are Monoclines formed?
Formation. By differential compaction over an underlying structure, particularly a large fault at the edge of a basin due to the greater compactibility of the basin fill, the amplitude of the fold will die out gradually upwards.
What is mineral lineation?
Mineral lineations are sometimes defined by oriented single crystals of elongate minerals like hornblende or kyanite, but in other rocks the lineation is defined by elongate aggregates of grains, and the grains may be elongate or equant in shape.
What is lineation in a rock?
Lineation is a general term to describe any repeated, commonly penetrative and parallel alignment. of linear elements within a rock (to envision lineation, imagine packages of spaghetti). A lineation. may be a primary igneous or sedimentary fabric element, such as an array of elongate K-feldspar.