What does obduction mean?
Definitions for obduction
ob·duc·tion
This dictionary definitions page includes all the possible meanings, example usage and translations of the word obduction.
Samuel Johnson's Dictionary
Obductionnoun
The act of covering, or laying a cover.
Etymology: from obductio, obduco, Latin.
Wikipedia
Obduction
Obduction is a geological process whereby denser oceanic crust (and even upper mantle) is scraped off a descending ocean plate at a convergent plate boundary and thrust on top of an adjacent plate. When oceanic and continental plates converge, normally the denser oceanic crust sinks under the continental crust in the process of subduction. Obduction, which is less common, normally occurs in plate collisions at orogenic belts (where an oceanic plate that is subducting scrapes some of its material onto the continental plate) or back-arc basins (places where the edge of a continent is pulled away from the rest of the continent due to the stress of plate collision).Obduction of oceanic lithosphere produces a characteristic set of rock types called an ophiolite. This assemblage consists of deep-marine sedimentary rock (chert, limestone, clastic sediments), volcanic rocks (pillow lavas, volcanic glass, volcanic ash, sheeted dykes and gabbros) and peridotite (mantle rock). John McPhee describes ophiolite formation by obduction as "where ocean crust slides into a trench and goes under a continent, [and] a part of the crust - i.e., an ophiolite - is shaved off the top and ends up on the lip of the continent."Obduction occurs where a fragment of continental crust is caught in a subduction zone with resulting overthrusting of oceanic mafic and ultramafic rocks from the mantle onto the continental crust. Obduction often occurs where a small tectonic plate is caught between two larger plates, with the crust (both island arc and oceanic) welding onto an adjacent continent as a new terrane. When two continental plates collide, obduction of the oceanic crust between them is often a part of the resulting orogeny.Most obductions appear to have initiated at back-arc basins above the subduction zones during the closing of an ocean or an orogeny.
Webster Dictionary
Obductionnoun
the act of drawing or laying over, as a covering
Etymology: [L. obductio.]
Wikidata
Obduction
Obduction is the overthrusting of continental crust by oceanic crust or mantle rocks at a convergent plate boundary, such as closing of an ocean or a mountain building episode. This process is uncommon as the denser oceanic lithosphere usually subducts underneath the less dense continental plate. Obduction occurs where a fragment of continental crust is caught in a subduction zone with resulting overthrusting of oceanic mafic and ultramafic rocks from the mantle onto the continental crust. Obduction often occurs where a small tectonic plate is caught between two larger plates, with the crust welding onto an adjacent continent as a new terrane. When two continental plates collide, obduction of the oceanic crust between them is often a part of the resulting orogeny. Obduction is a process involving several mechanisms. These may include upwedging, compressional telescoping, gravity sliding or transformation of a spreading ridge to a subduction zone. Most obductions appear to have initiated at back-arc basins above the subduction zones during the closing of an ocean or an orogeny.
Numerology
Chaldean Numerology
The numerical value of obduction in Chaldean Numerology is: 3
Pythagorean Numerology
The numerical value of obduction in Pythagorean Numerology is: 4
Translations for obduction
From our Multilingual Translation Dictionary
- obducciónSpanish
- ಅಪಹರಣKannada
- obductionThai
- obductionVietnamese
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"obduction." Definitions.net. STANDS4 LLC, 2024. Web. 25 Apr. 2024. <https://www.definitions.net/definition/obduction>.
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