Lamination Geology Definition

In geology lamination is a small scale sequence of fine layers laminae.

Lamination geology definition. Definition of cross lamination i. However structures from several millimetres to many centimetres. The importance of the structure lies in its worldwide distribution and frequent occurrence in such diverse sediments as river channel and levee sands and in turbidity current deposits. The term planar lamination is commonly taken to indicate planar laminae that are more or less horizontal within a few degrees when originally deposited and that have more or less parallel bounding surfaces but laminae do vary in thickness laterally.

Introduction 1 1 you might have heard us define structure in rocks as rock geometry on a scale much larger than grains this is a singularly unilluminating definition be cause it doesn t conjure up in the mind of the uninitiated any of the great variety of interesting and significant geometries that get produced by the physical chemical. External stratification more beds and the term lamina is sometimes applied to a unit less than one centimetre in thickness. Climbing ripple cross lamination sorby s 1859 1908 ripple drift bedding is an important and significant sedimentary structure resulting from the action of unidirectional currents. Laminated board for example consists of thin layers of wood bonded together.

During crustal extension in the basin and range province 10 million years ago the upwelling of asthenosphere thinned the lithosphere. Heating caused by the rise of the. In geophysics delamination refers to the loss and sinking of the portion of the lowermost lithosphere from the tectonic plate to which it is attached. The state of being laminated.

One example of the effects of lithosphere delamination is seen in the sierra nevada us basin and range province and colorado plateau in the western usa. This can occur when the lower portion lithosphere is more dense than the surrounding mantle because of this instability higher density material atop lower density material the lower lithosphere separates from the tectonic plate and sinks. Lamina that occurs in sedimentary rocks laminae are normally smaller and less pronounced than bedding lamination is often regarded as planar structures one centimetre or less in thickness whereas bedding layers are greater than one centimetre. Similarly laminated fabric consists of two or.

The structure commonly present in granular sedimentary rocks that consists of tabular irregularly lenticular or wedge shaped bodies lying essentially parallel to the general stratification and which themselves show a pronounced laminated structure in which the laminae are steeply inclined to the general bedding. Lamination in technology the process of building up successive layers of a substance such as wood or textiles and bonding them with resin to form a finished product.