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Meteorização fisica das rochas

Maria Martins

Created on January 13, 2024

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Transcript

Meteorização

física

Start

Biologia e Geologia 11.ºano A Maria Martins e Rúben Inácio

Rochas sedimentares

Sedimentogénese

Nota:

Sedimentação/ Deposição

Transporte

Erosão

Meteorização

Sedimentogénese

Rochas sedimentares não consolidadas

Química

Diagénese

Física

Rochas sedimentares consolidadas

Meteorização

Meteorização física

Processo que leva à alteração da rocha mãe por ação de agentes físicos ou químicos.

Conjunto de processos que causam alteração da rocha sem modificar a sua composição química.

Meteorização

Física/ mecânica

Química

Esfoliação/ Disjunção esferoidal

Bioclastia

Crioclastia

Termoclastia

Haloclastia

Química

Bioclastia

  • Desencadeada pela ação dos seres vivos.

Fig. 2 - Crescimento de raízes em fraturas de rochas.

Fig. 1 - Cavidades em rochas do litoral escavadas por moluscos bivalves.

Crioclastia

  • Desencadeada pela ação do gelo.

Fig. 4 - Efeito da água que penetra nas fissuras e nos poros das rochas, ao congelar.

Fig. 3 - Desagregação das rochas devido à expanção da água, por congelação, na Serra da estrela.

Termoclastia

  • Devido á ocorrência de elevadas amplitudes térmicas.

Fig. 5 - Fragmentação de uma rocha por efeito de variação térmica.

Haloclastia

  • Devida à evaporação de água salgada.

Fig. 6 e 7- Efeito da haloclastia em rochas.

Esfoliação/ Dinjunção esforoidal

  • Resulta do alívio de pressão.

Fig. 9 - Diáclases.

Fig. 10 - Disjunção esferoidal.

Fig. 8 - Diáclases no granito na serra das Mesas, Sabugal.

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  • Generate experiences with your content.
  • It’s got the Wow effect. Very Wow.
  • Make sure your audience remembers the message.

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  • Generate experiences with your content.
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  • Make sure your audience remembers the message.

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  • Generate experiences with your content.
  • It’s got the Wow effect. Very Wow.
  • Make sure your audience remembers the message.