Dec 22, 2017 · Refold structures are commonly divided into types 1, 2 and 3 according to the relative or-ientations of the two folding phases, which produce interference pat-terns in horizontal surfaces referred to as “dome-and-basin ”, “crescent ” and coaxial or hook , respectively (Ramsay, 1967; Thiessen, 1986).

Type 2 fold interference pattern. If on the other hand, the extension direction in the second deformation is at a high angle to the early axial surfaces, then those axial surfaces may be folded too. Under these circumstances outcrop patterns are characterized by complex shapes that resemble mushrooms and bananas.

The complex geometries resulting from superposition of folding have been classified by characteristic fold interference patterns, which appear on two-dimensional sections through the three-dimensional refold structures (Ramsay, 1967, …

Jan 1, 2004 · The synchronous development of Type 2 and Type 3 fold interference patterns is attributed to variation in the hinge of F2 folds by as much as 90°, suggesting the development of a regional-scale sheath-like fold geometry during D2.

This sequence duplicates the well known fold interference patterns of Ramsay, although see Theissen & Means and Theissen for a more complete scheme. Click on the images to launch Noddy. A legend is provided at the end of this page. This is a type 1 pattern, also known as a dome and basin pattern.

4 fold interference patterns, draw the traces of the F1 (first folding) and F2 (second folding) hinge surfaces. Also draw schematic cross sections along lines AA’ and BB’.

Oct 1, 2018 · Type 1–2 fold interference pattern produced by refolding of a map-scale, inclined synform. Folds are commonly found in association with ductile shear zones. However, superimposed folding contemporaneous with shearing is rarely reported.

Jan 1, 1980 · Type 2 patterns arise for combinations of ,t, fl and ~, plotting in the interior of the orientation volume or on its top or bottom surfaces. One of our aims has been to discover whether there is any natural way to subdivide Type 2 patterns.

FOLD INTERFERENCE, TYPE 2. This pattern develops when early nearly flat lying or recumbent to reclined folds are superimposed by late upriqht folds in a manner so that the axes of two sets of folds are at high angle to each other.

Map showing the dome-crescent-mushroom (Type 2) fold interference pattern dominating outcrops around NCGM. Orientation diagrams, using plotting techniques after Allmendinger (2002),...