What do you mean by nappe & Sill?

nappe, in geology, large body or sheet of rock that has been moved a distance of about 2 km (1.2 miles) or more from its original position by faulting or folding.

What is nappe in math?

One of the two portions of a double cone, which is positioned apex to apex, is termed as Nappe.

What does nappe tablecloth mean?

[nap ] de table) tablecloth. [de brouillard] blanket.

How is a nappe fold formed?

Nappes form when a mass of rock is forced (or "thrust") over another rock mass, typically on a low angle fault plane. The resulting structure may include large-scale recumbent folds, shearing along the fault plane, imbricate thrust stacks, fensters and klippes.

What do you mean by eluvium?

Definition of eluvium

1 : rock debris produced by the weathering and disintegration of rock in situ — compare alluvium. 2 : fine soil or sand deposited by wind (as in dunes)

What does nappe mean?

What is Desilication in geography?

Definition of desilication

: removal of silica from a magma especially by interaction with limestone and its transfer to the enveloping wall rock where it is fixed in the form of various silicates.

What is Eluvial and Illuvial?

In soil science, eluviation is the transport of soil material from upper layers of soil to lower levels by downward percolation of water across soil horizons, and accumulation of this material (illuvial deposit) in lower levels is called illuviation.

What is nappe in fluid?

In hydraulic engineering, a nappe is a sheet or curtain of water that flows over a weir or dam. The upper and lower water surface have well-defined characteristics that are created by the crest of a dam or weir.

What is Kashmir nappe?

Nappes form during continental plate collisions, when folds are sheared so much that they fold back over on themselves and break apart. The Kashmir Valley has been described as a great synclinal (Wadia, 1975), seated on the back of a vast nappe, Kashmir nappe.

What is an Anticlinorium?

Definition of anticlinorium

: a series of anticlines and synclines so grouped that taken together they have the general outline of an arch —opposed to synclinorium.

What is a table nappe?

tablecloth {noun} table (also: nappe)

What is nappe in conic section?

The nappes are the upper and lower portions of the conical surface which is divided by the apex. The question is what is a conical section? A conic section is the area of intersection of a conical surface with a plane that does not pass through its apex.

What is a klippe in geology?

A klippe is defined as a large block that has been tectonically transported. The block is isolated on all sides and rests on or with a foreign (exotic) framework of other formations. In German, the common word Klippe means a rocky eminence or crag or a sea stack.

What is generator of cone?

Generator: The straight line which runs from the apex of the cone to the base. Axis: The straight line running from the apex of the cone to the centre of the base.

What is overthrust fold?

landform development

In tectonic landform. These processes of overthrusting (or underthrusting) and folding result from horizontal forces that cause crustal shortening (in its horizontal dimension) and crustal thickening.

What is Isoclinal fold?

A very tight fold, in which the limbs are parallel or nearly parallel to one another is called an isoclinal fold (Figure 12.6). Isoclinal folds that have been overturned to the extent that their limbs are nearly horizontal are called recumbent folds.

What is recumbent fold?

A recumbent fold is one in which the axial plane is essentially horizontal, with the limit of variation of axial-planar dip, and the resulting limit of plunge, being 10° (Turner and Weiss, 1963; Fleuty, 1964). It is a sideways-closing neutral structure that is neither a synformal nor an antiformal fold.

What does nappe and sill mean?

The sheet of water flowing through a notch or over a weir is known as nappe or vein. The bottom edge of the notch or the top of a weir over which water flows is known as sill or crest.

What do you mean by nappe & Sill?

Sill- The bottom part, over which the liquid flows, is called sill or crest of the notch and the sheet of liquid flowing over a notch (or a weir) is called nappe or vein. A notch is, normally product of a metallic plate and is used to degree the discharge of liquids.

Why it is important to study the types of nappe?

It is especially important to observe the behavior of the weir nappe to ensure the design provides hydraulic optimization and to account for pressure fluctuations, possible vibrations, resonance effect, noise and flow surging.

Is eluvial a word?

e•lu•vi•al

of or pertaining to eluviation or eluvium.

What is eluvial gold?

Eluvial gold (disintegration of rock at the site where it originates - not there through water movement) are essentially primary gold broken down by weathering and erosion and transported by gravity or water movement over many millenia of geological time.

What is the eluvial zone?

A soil horizon formed due to eluviation is an eluvial zone or eluvial horizon. In a typical soil profile, the eluvial horizon refers to a light-colored zone located either at the lower part of the A horizon or within a distinct horizon below the A, where the process is most intense and rapid.

What is desilication of soil?

Desilication (or desilicification) is the removal of silicon from a soil or soil horizon, relative to some less mobile component or components. Characteristic of pedogenesis in the humid tropics where silicon tends to be more mobile than iron and aluminum in well drained soils.