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Transcript of Diastrophic Movements
And more especially to
Folding and faulting Diastrophism Evidence of
Movement (also known as a quake, tremor or temblor)
is the result of a
sudden release of energy in the
Earth's crust that
creates seismic waves. Earthquakes ~ evidences that the solid earth
is not stable but is continuously
undergoing crustal adjustments. Periodic Tremors Folds
Joints Second Type
of Evidence Faults
~ fracture of rock
with displacement. Folds
~bending of rock without
breaking (including tilting). Anticlines ~ rocks with beds arched up, as in an uphold are important records in attempting
to reconstruct the probable past history of a particular region. Unconformities 150 large earthquakes happened a year Joints
~ fracture of rock
without displacement. Synclines ~ is a fold with younger layers closer to the center of the structure.Crest are down folds in the form of troughs Geoanclines & Geosynclines
~ folds which are very large dimensions Faulting Joints Disconformity ~ is an unconformity between parallel layers of sedimentary rocks which represents a period of erosion or non-deposition. Nonconformity ~ exists between sedimentary rocks and metamorphic or igneous rocks when the sedimentary rock lies above and was deposited on the pre-existing and eroded metamorphic or igneous rock Angular unconformity ~ is an unconformity where horizontally parallel strata of sedimentary rock are deposited on tilted and eroded layers, producing an angular discordance with the overlying horizontal layers
Paraconformity ~ is a type of unconformity in which strata are parallel; there is little apparent erosion and the unconformity surface resembles a simple bedding plane. It is also called nondepositional unconformity or pseudoconformity. Disconformity Nonconformity Angular Conformity Paraconformity