A clastic dike is the geological term used to describe a seam of 'foreign' sedimentary material (often breccia) that fills cracks in sedimentary strata. Geology (from Greek γη gê, "earth" and λόγος Logos, "speech" lit Sedimentary rock is one of the three main rock types (the others being igneous and Metamorphic rock) Breccia (ˈbrɛtʃiə ˈbrɛʃiə breach is a rock composed of angular fragments of several Minerals or rocks in a matrix, that is a cementing material In Geology and related fields a stratum (plural strata) is a layer of rock or Soil with internally consistent characteristics that distinguishes Since sedimentary strata are usually formed by deposition in the horizontal plane, they usually remain in that orientation, except when subjected to tilt. Deposition is the geological process by which material is added to a Landform or land mass Strike and dip refer to the orientation or attitude of a Geologic feature Clastic dikes are, therefore, more likely to be vertical or near-vertical. They can vary in thickness from a few centimetres to several metres wide and their height is usually many times their width.
Clastic dikes are typically produced by seismic disturbance of high water content sediments. Examples include sand filled sills and dikes in mudstones injected by fluidized sand from below during a penecontemporaneous earthquake event in the Annedale, Northern Wairarapa, New Zealand tectonic area. An earthquake is the result of a sudden release of energy in the Earth 's crust that creates Seismic waves Earthquakes are recorded with a Seismometer New Zealand is an Island country in the south-western Pacific Ocean comprising two main landmasses (the North Island and the South Island [1] Clastic dike swarms associated with salt dome diapirism is reported from the Dead Sea region. A salt dome is a type of structural dome formed when a thick bed of Evaporite minerals (mainly salt or Halite) found at depth intrudes vertically into A diapir (ˈdaɪəpɪər) ( French, from Greek diapeirein, to pierce through is an Intrusion caused by Buoyancy and Pressure The Dead Sea (יָם הַמֶּלַח, "Sea of Salt"البَحْر المَيّت, "Dead Sea" is a salt lake between [2]
Clastic dikes are used in paleoseismological studies as evidence of ancient earthquakes. Paleoseismology looks at Geologic Sediments and rocks, for signs of ancient Earthquakes It is used to supplement seismic monitoring [3]
References
- ^ G. Neef, A clastic dike-sill assemblage in late Miocene (c. 6 Ma) strata, Annedale, Northern Wairarapa, New Zealand, New Zealand Journal of Geology & Geophysics, 1991, Vol. 34: 87—91 http://www.rsnz.org/publish/nzjgg/1991/11.php
- ^ Tsafrir Levi et al. , Earthquake-induced clastic dikes detected by anisotropy of magnetic susceptibility, GEOLOGY, February 2006, v. 34; no. 2; p. 69–72; http://geophysics.tau.ac.il/personal/shmulik/ClasticDikes-AMS-Geology06.pdf
- ^ Kevin G. Stewart, 2003, Paleoseismology http://www.unc.edu/~kgstewar/web_pages/paleoseismology.html
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