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Transcript of Serralades
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Dolors GuixaCTMA 1r Batxillerat
Tema 5: Serralades
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1. DEFORMACIONS DE LES ROQUES.1.1. ESFORÇOS.1.2. DEFORMACIONS PLÀSTIQUES: PLECS.1.3. DEFORMACIONS FRÀGILS: FALLES I DIÀCLASIS.
2. METAMORFISME2.1. FACTORS.2.2. CANVIS FISICOQUÍMICS.2.3. TIPUS:- REGIONAL- TÈRMIC- D’ENTERRAMENT.- DINÀMIC.
2.4. MIGMATITZACIÓ I ANATÈXIA.3. ORÒGENS
3.1. CARACTERÍSTIQUES.3.2. TIPUS.
ÍNDEX
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1.1. Esforços.
1. Deformacions de les roqeus
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Tipus de deformacions de les roques:
Cal pensar com actua un mateix esforç sobre: un guix, la plastilina o una golla de cabell o esborrar.
1- DEFORMACIÓ ELÀSTICA: Reversible I temporal. No es formen estructures tectòniques. Ex. Les ones sísmiques.2- DEFORMACIÓ PLÀSTICA: dóna corbes,plecs I foliació, permanent. 3- DEFORMACIÓ FRÀGIL: es trenca I són permanents. Si hi ha algun moviment esformen falles I encavalcaments. Si no hi ha moviment: diàclasis.
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Factors que condiciones el comportament de les roques en ser deformades:
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Són curvatures o ondulacions en estrats sotmesos a esforços compressius laterals o de cizalla.
En roques de comportament plàstic, es dóna una deformació permanent I contínua, sense trencament.
S’observen en roques sedimentàries en roques metamòrfiques amb foliació.
La majoria es formen en profunditat, per un agument de P I T.
1.1. deformacions plàstiques: els plecs
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Fractures produïdes en roques per esforços.2 tipus:
DIÀCLASIS: Fractures sense desplaçament. Originades simultàniament amb la roca degut a esforços tectònics per expansió I en baixar la pressió. FALLES: fractures amb desplaçament dels blocs.El seu origen és per compressió, tensió…En materials de comportament fràgil.
1.3. Deformacions fràgils: diàclasis I falles.
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