Exam 9: Crustal Deformation

A ________ fault develops in response to horizontal, tensional stresses in crustal rocks.

For plunging synclines the trace of the beds in outcrop create patterns on the map that converge at a point: down plunge (in the direction of plunge), or up plunge (opposite to direction of plunge).

Most earthquakes form a new fault where one did not exist before.

Fractures which appear in unloaded rock, yet do not involve any fault slippage, are called joints.

The outer flanks of the Colorado Plateau are marked by a series of ________ displaying a narrow zone of steeply inclined beds that flatten out to form elevated upland areas.

Crowsnest Mountain on the Lewis thrust in Alberta is an eroded thrust-outlier called a ________.

A graben is an upraised block bounded by two reverse faults.

Examine the words and/or phrases for each question below and determine the relationship among the majority of words/phrases. -Choose the option that does not fit the pattern.

A thrust fault has ________.

The Michigan geologic map shows older Precambrian crystalline metamorphic rocks, surrounding Paleozoic marine strata (in roughly circular patterns), surrounding a central core area of Carboniferous rocks.What is this structure?

Plastic (ductile)deformation occurs more readily in warm rock than in cool rock.

Examine the words and/or phrases for each question below and determine the relationship among the majority of words/phrases. -Choose the option that does not fit the pattern.

Name two major strike slip faults that show hundreds of kilometres of offset.

Erosion along strike slip fault zones produces ________.

Which is not evidence of former structural deformation or major tectonic forces that affected rocks of continental interiors?

The one factor that geologists are unable to duplicate under laboratory conditions is: really high rates and the instantaneous application of large stresses, or the application of very small stresses over long time spans.

Rocks resist deformation and maintain their rigid shapes until they fault or fracture.

The strength of rocks is influenced by many inherent factors like: mineralogy, texture, grain size, porosity, fluid content, thickness, pre-existing fractures etc., but what are the three main external variables that influence whether or how rocks deform?

Name three modern tools or techniques that aid in the mapping of large scale geologic structures.

Each of the block diagrams below portrays a specific kind of geologic structure.Write the name of the structure on the blank provided beside each block diagram. a)____________________________ b)_____________________________