tectogene

tectogene

      great downbuckle of the Earth's crust into the mantle below deep-sea trenches that are filled with marine sediments. The sediments become crumpled and folded within the deep downbuckle; some portions are squeezed downward into the mantle, while others are squeezed upward in highly deformed and dislocated strata. According to the theory of Dutch geophysicists working in Indonesia under the leadership of Felix Andries Vening Meinesz in the 1930s, the development of a tectogene is a necessary precursor to orogenic, or mountain-building, activity. According to this theory, the folded and dislocated trench sediments are incorporated into island arcs, which in turn become the site of Andean-type and, finally, Himalayan-type orogenic belts. See also geosyncline; orogeny.

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  • tectogène — [tɛktɔʒɛn] adj. ÉTYM. Mil. XXe; de tecto , et gène. ❖ ♦ Didact. Se dit d une zone de dislocation de l écorce terrestre qui aurait donné naissance à une chaîne de montagnes …   Encyclopédie Universelle

  • tectogene — tec·to·gene …   English syllables

  • tectogene — …   Useful english dictionary

  • tecto- — ⇒TECTO , élém. formant Élém. tiré du gr. , de « charpentier, constructeur » ou de « charpente », entrant dans la constr. de qq. termes techn.: tectogène, adj., géol. [En parlant d une zone de dislocation de l écorce terrestre] Qui donne naissance …   Encyclopédie Universelle

  • Oceanic trench — Oceanic crust is formed at an oceanic ridge, while the lithosphere is subducted back into the asthenosphere at trenches. The oceanic trenches are hemispheric scale long but narrow topographic depressions of the sea floor. They are also the… …   Wikipedia

  • τεκτογενής — ές, Ν το ουδ. ως ουσ. το τεκτονενές γεωλ. μεγάλη προς τα κάτω κάμψη τού εξωτερικού τμήματος ενός γεωσυγκλίνου, το οποίο καταβυθίζεται βαθιά μέσα στον πυκνότερο γήινο μανδύα. [ΕΤΥΜΟΛ. Αντιδάνεια λ., πρβλ. αγγλ. tectogene < τέκτων, ονος + γενής… …   Dictionary of Greek

  • tectogen — tectogén adj. m., pl. tectogéni; f. sg. tectogénă; pl. tectogéne Trimis de siveco, 10.08.2004. Sursa: Dicţionar ortografic …   Dicționar Român

  • -gen — comb. form 1 Chem. that which produces (hydrogen; antigen). 2 Bot. growth (endogen; exogen; acrogen). Etymology: F gegravene f. Gk genes born, of a specified kind f. gen root of gignomai be born, become * * * gen «jehn», noun, verb, genned,… …   Useful english dictionary

  • tectogenic — adjective see tectogene …   Useful english dictionary

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