What is a kink fold?

Kink folds form in rocks with regular layering, either in regular sedimentary bedding or as a late stage fold in foliation. Conjugate folds are paired folds with paired axial surfaces symmetrical to each other. Kink in Precambrian-Wallace Fm.

What are kink bands?

Kink bands are structures common in the deformation of solids with a well-developed and mechanically effective planar foliation. Geologic interest in kink bands derives from their occurrence in foliated rock where bedding, cleavage, or schistosity acts as an effective glide plane.

What is kinking in geology?

Kinking occurs when slip on a single slip plane is inadequate to maintain homogeneous deformation. The grain sharply bends (kinks) and the deformation localizes into kink bands, which enable shortening of the grain to continue.

What are twin bands?

Bands across a crystal grain, observed on a polished and etched section, where crystallographic orientations have a mirror-image relationship to the orientation of the matrix grain across a composition plane that is usually parallel to the sides of the band. previous: Twin.

What is fold and types of fold?

Three forms of folds: syncline, anticline, and monocline. An anticline is a fold that is convex upward, and a syncline is a fold that is concave upward. An anticlinorium is a large anticline on which minor folds are superimposed, and a synclinorium is a large syncline on which minor folds are superimposed.

What is Isoclinal fold?

or isocline, a fold in sedimentary rocks where the axial surface and limbs slope in the same direction and at approximately the same angle. Isoclinal folds are formed under conditions of intensive lateral compression or with slipping brought about by the force of gravity.

What is flexure folding?

In flexural folds, competent layers do not change their thicknesses and incompetent layers are marked by cleavage sets nearly parallel to fold axial surface. Flexural folds are the most common folds in sedimentary basins. Flexural folds are subdivided into flexural-slip folds and flexural-flow folds.