Table of Contents
What is lineation in metamorphic rock?
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.
How can you identify a strike and dip of the plane from its projection on the Stereonet?
Determing the Strike and Dip of a Plane from a stereonet 3) Make a tick mark on your tracing paper on top of the North from the stereonet. To find the strike of the plane, rotate the tracing paper back to normal, being careful not to lose track of the tick mark you just made. The trend is the azimuth of the tick mark.
What is a lineation on a stereonet?
Lineations are structures with one dimension much longer than the others. A sheet of paper is a good analogy for a plane, but a pencil is a good analogy for a lineation.
What is stereonet in geology?
A stereonet is a lower hemisphere graph on to which a variety of geological data can be plotted. Stereonets are used in many different branches of geology and can be used in a range of ways beyond those which are discussed here (see references for further uses).
What is literary lineation?
Lineation in poetry is how lines are divided and where they end in relation to a clause or thought. Having a line break at the end of a phrase or complete thought is a regular and expected pattern in poetry. Poets subvert this expectation by using a technique called enjambment.
How would you describe foliation in metamorphic rocks?
Foliation describes a metamorphic rock whose minerals are aligned in layers. These rock minerals look like stripes or bands that are arranged in parallel layers. Extreme pressure causes the minerals to form these layers. As they compress, the minerals flatten and elongate to create a layered look.
What is a stereonet used for?
A stereonet allows the stereographical projection of three-dimensional information onto a two-dimensional plane (usually as a piece of paper or computer image) and is used as a tool applied to a range of geological problems including the removal of structural tilt.
What causes foliation in metamorphic rocks?
Foliation forms when pressure squeezes the flat or elongate minerals within a rock so they become aligned. These rocks develop a platy or sheet-like structure that reflects the direction that pressure was applied.
What is lineation where is it formed?
Lineations are a series of parallel lines on a rock surface, formed by tectonic processes, by the transportation and deposition of sand under upper-flow-regime plane-bed conditions, or by the movement of glacial ice over the rock surface.
What type of metamorphism causes foliation?
Regional metamorphism usually produces foliated rocks such as gneiss and schist. Dynamic Metamorphism also occurs because of mountain-building. These huge forces of heat and pressure cause the rocks to be bent, folded, crushed, flattened, and sheared.
Is metamorphic a change from one thing to another?
However, the word “metamorphosis” is a broad term that indicates a change from one thing to another. Even rocks, a seemingly constant substance, can change into a new type of rock. Rocks that undergo a change to form a new rock are referred to as metamorphic rocks.
What is metamorphic rock made of?
Metamorphic rock, estimated to be as old as 3.8 billion years, located near Isua at Qorqut Sound, Greenland. rock formed by the cooling of magma or lava. molten rock, or magma, that erupts from volcanoes or fissures in the Earth’s surface. molten, or partially melted, rock beneath the Earth’s surface.
How do metamorphic rocks recrystallize?
In the first way, sandstone or chert recrystallizes resulting in a metamorphic rock under the pressures and temperatures of deep burial. A quartzite in which all traces of the original grains and sedimentary structures are erased may also be called metaquartzite.
How does sandstone become metamorphic rock?
In the first way, sandstone or chert recrystallizes resulting in a metamorphic rock under the pressures and temperatures of deep burial. A quartzite in which all traces of the original grains and sedimentary structures are erased may also be called metaquartzite. This Las Vegas boulder is a metaquartzite.