Geografie relieful structural_Pinzariu Bianca
Transcript of Geografie relieful structural_Pinzariu Bianca
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Relieful
Structural
Pînzariu Bianca Elena
Clasa a IX-a D
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Structura geologică reprezintă modul
de aşezare a stratelor şi a altor corpuri de
roci din scoarţa terestră şi raporturile dintre
acestea.
Relieful structural reprezintă un
ansamblu de forme distincte pe care agenţii
externi le creează pe diferite tipuri de
structuri geologice.
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Agenţi şi proceseAgenţi dominanţi:
- structura geologică;
- schimbări de temperatură;
- apa ;
- gravitaţia;
Procese geomorfologice predominante:
- pluviodenudarea;
- dezagregarea;
- eroziunea fluviala si torenţială;
- prăbuşiri, alunecări;
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Relieful dezvoltat pe structura tabulară
(orizontală)Stratele sunt orizontale sau apropiate de orizontala si au
grosime si alcatuire diferite;
Specificul reliefului in aceasta structura este impus de:
simetria formelor, energia de relief relativ redusa, gradul de
complexitate diferit impus de frecventa alternatei stratelor
dure cu cele moi;
Formele de relief:
- Vaile: - simetrice si inguste in strate de roci dure si
omogene (chei, defilee, canioane etc);
- simetrice si largi in stratele alcatuite din roci moi;
- simetrice cu versanti in trepte, in structura cu
strate ce au rezistenta diferita;
- Interfluviile: - plate in podisurile alcatuite din roci dure
- rotunjite cand predomina rocile cu
rezistenta redusa.
- Versantii: - abrupti in rocile omogene dure;
- lini in roci omogene moi;
- cu caracter complex (alternata de roci dure si moi);
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Relieful pe structuri monoclinale
Structura este alcatuita din strate ce inclina intr-o anumita directie;
Forme de relief:
- Cuesta (C) (cu urmatoarele elemente: suprafata structurala (Ss), fruntea de cuesta (Fc), muchia
cuestei);
- Vai in structuri monoclinale – consecvente(Vc),subsecvente (Vs);obsecvente(Vo);
- Hogbackul – interfluviu relativ simetric, unde stratele au inclinare peste 60 , suparafata structurala
si fruntea au caderi similare;
- Depresiunea subsecventa (Ds),favorizata de alternanta stratelor dure cu cele moi;
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Hogback-Denver, California
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Relieful dezvoltat pe structuri cutate
Cutele sunt ondulari mai largi sau mai inguste ale stratelor sedimentare care au fost realizate de catre miscarile tectonice;
Elementele specifice sunt: anticlinalul (bucla cutei orientata in sus), sinclinalul (bucla orientata in jos); axul cutei, flancurile cutei (sectoarele laterale ale cutei), inaltimea etc;
Forme de relief – de concordanta (rezultate in urma tectonicii):
- valea de sinclinal (in lungul sinclinalului);
- depresiunea sinclinala (culoar in lungul unui sinclinar larg);
- culmile de anticlinal (interfluvii desfasurate in lungul unui anticlinal;
- derivate (rezultate in urma eroziunii):
- butoniera (depresiune creata in lungul axului culmilor de anticlinal);
- valea de anticlinal (vale dezvoltata in lungul axului unui anticlinal);
- sinclinal suspendat (interfluviu individualizat pe o cuta sinclinala larga).
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Anticlinalul
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Anticlinal
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Anticlinal
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Sinclinal şi anticlinal
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Sinclinal-California
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Sinclinal şi anticlinal
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Sinclinal
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Relieful dezvoltat pe structura faliata
Orice structura initiala (tabulara, cutata, monoclinala) poate deveni structura faliata, daca este afectata de miscari tectonice, fragmentata in blocuri ce pot fi ridicate sau coborate.
Forme de relief:
- Horsturile – blocuri faliate si inaltate, marginite prin abrupturi. Sunt
caracteristice masivelor muntoase hercinice si caledoniene;
- Grabenele – depresiune dezvoltata la nivelul unui bloc coborat si care este
inconjurata de masive muntoase ridicate tectonic. Intre ele sunt
planuri de falie (depresiunile Brasov, Petrosani etc);
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Graben-Depr.Afar
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Horsturi şi grabene în Death Valley
(fotografie din satelit)
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Grabenul Rhinului(canion)
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Horsturi şi grabene
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Horsturi şi grabene
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Falie
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Falie
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Falie
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Bibliografie
Wikipedia.com
Didactic.ro