different between obduction vs subduction

English

Etymology

Latin obductio; see Latin ob, ductio.

Noun

obduction (countable and uncountable, plural obductions)

1. (obsolete) The act of drawing or laying over, as a covering.
2. (largely obsolete) An autopsy.
3. (geology) The overthrusting of continental crust by oceanic crust or rocks from the mantle, such that the oceanic crust is thrust onto the continental crust, as occurs at a convergent plate boundary when the continental crust is caught in a subduction zone.
   • 2004, Gérard M. Stampfli, Gilles D. Borel, Chapter 3: The TRANSMED Transects in Space and Time, William Cavazza, François M. Roure, Wim Spakman, Gérard M. Stampfli, Peter A. Ziegler (editors), The TRANSMED Atlas: The Mediterranean Region from Crust to Mantle, Springer, page 73,

     Around Arabia - as well as in the Himalayas - these obductions completely obliterated the Neotethyan ocean, which in this time frame is represented only by a few exotic blocks and by Permo-Triassic pelagic sediments found at the sole of the Cretaceous ophiolites.

   • 2011, Wolfgang Frisch, Martin Meschede, Ronald C. Blakey, Plate Tectonics: Continental Drift and Mountain Building, Springer, page 72,

     These frictional forces slowed the obduction of the ophiolite onto the continental margin and obduction ceased after the nappe was transported 100–200 km.

Coordinate terms

• subduction

References

• obduction in Webster’s Revised Unabridged Dictionary, G. & C. Merriam, 1913.

English

Etymology

From Latin subductio; see Latin sub, ductio.

Pronunciation

• (Received Pronunciation) IPA^(key): /s?b?d?k??n/

Noun

subduction (countable and uncountable, plural subductions)

1. The action of being pushed or drawn beneath another object.
2. (geology) The process of one tectonic plate moving beneath another and sinking into the mantle at a convergent plate boundary.
   • 2000, Ki-Hong Chang, Sun-Ok Park, Soobum Chang, Upper Mesozoic unconformity-bounded units of Korean Peninsula with Koguryo Magmatic Province, H. Okada, N. J. Mateer (editors), Cretaceous Environments of Asia, Elsevier, page 108,

     Therefore, both a mantle plume and also the subductions of the oceanic plates may have mutually contributed to create the magmatic zone.

   • 2003, Peter D. Clift, Hans Schouten, Amy E. Draut, A general model for arc-continent collision and subduction polarity reversal from Taiwan and the Irish Caledonides, Robert D. Larter, Philip T. Leat (editors), Intra-oceanic Subduction Systems: Tectonic and Magmatic Processes, The Geological Society, page 91,

     Evidence for a subduction polarity flip is clear in the Irish Caledonides, where the S-dipping slab beneath the Lough Nafooey arc (Dewey & Ryan 1990; Clift & Ryan 1994) became a N-dipping subduction zone after the Grampian Orogeny.

   • 2012, Beth Shaw, Active Tectonics of the Hellenic Subduction Zone, Springer, page 61,

     Earthquakes on the subduction interface itself are low-angle thrusts in the depth range 15–45 km, generally reaching a maximum depth of 20 km in the west and 45 km in the centre of the arc, near Crete.

3. The act of subducting or taking away.
   • 1659, Joseph Hall, The Invisible World, Discovered to Spirituall Eyes, and Reduced to Usefull Meditation

     threatened the subduction of his own presence

4. Arithmetical subtraction.
   • 1677, Matthew Hale, The Primitive Origination of Mankind, Considered and Examined According to the Light of Nature

     the other Operation of Arithmetick , namely , Subduction

5. (mathematics, mathematical analysis) A surjection between diffeological spaces such that the target is identified as the pushforward of the source.
   • 2012, Konrad Waldorp, A construction of string 2-group models using a transgression-regression technique, Clara L. Aldana, Maxim Braverman, Bruno Iochum, Carolina Neira Jiménez (editors), Analysis, Geometry, and Quantum Field Theory, American Mathematical Society, page 107,

     Accordingly, a diffeological principal S¹-bundle over a diffeological space X is a subduction ? : P ? X and a smooth map ? satisfying the same conditions; see [30] for a thorough discussion.

   • 2013, Patrick Iglesias-Zemmour, Diffeology, American Mathematical Society, page 59,

     Subductions (art. 1.46) express a global behavior of some surjections. As we localized the notion of induction and then obtained the notion of local induction (art. 2.15), the notion of subduction can be localized, or refined, as well, and leads to the concept of local subduction. Exercise 61, p. 60, illustrates the case where a subduction is not everywhere a local subduction.

Coordinate terms

• obduction

Derived terms

• subduction zone

Related terms

• subduct

Translations