Platform (geology)

In geology, aplatformis a continental area covered by relatively flat or gently tilted, mainlysedimentary strata,which overlie abasementof consolidatedigneousormetamorphic rocksof an earlier deformation. Platforms,shieldsand thebasement rockstogether constitutecratons.^[1]Platform sediments can be classified into the following groups: a "protoplatform" ofmetamorphosedsediments at the bottom, a "quasiplatform" of slightly deformed sediments, a "cataplatform", and an "orthoplatform" at the top. TheMesoproterozoic Jotnian sedimentsof theBaltic areaare examples of a "quasiplatform".^[2]The post-Ordovicianrocks of the South American Platform are examples of an orthoplatform.^[3]

References

^Parker, Sybil P. (Ed.). 1997.McGraw-Hill Dictionary of Geology and Mineralogy.New York: McGraw-Hill.
^Nagornji, M.A.; Nikolaev, V.G. (2005). "The quasiplatform sediments of the East European Platform".Russian Journal of Earth Sciences.7(5): 1–12.doi:10.2205/2005ES000171.
^de Almeida, F. F. M.; et al. (1976)."The Upper Precambrian of South America".Boletim IG-USP.7.Archived fromthe originalon 2015-10-01.Retrieved2015-09-29.

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[1] Parker, Sybil P. (Ed.). 1997.McGraw-Hill Dictionary of Geology and Mineralogy.New York: McGraw-Hill.

[Nago-2] Nagornji, M.A.; Nikolaev, V.G. (2005). "The quasiplatform sediments of the East European Platform".Russian Journal of Earth Sciences.7(5): 1–12.doi:10.2205/2005ES000171.

[BrazilOrtho-3] Almeida, F. F. M.; et al. (1976)."The Upper Precambrian of South America".Boletim IG-USP.7.Archived fromthe originalon 2015-10-01.Retrieved2015-09-29.

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See also

References