apresentação rework
description
Transcript of apresentação rework
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Rochas Sedimentares
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Revisões de Conceitos
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Rochas
Rochas Sedimentares
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Minerais
-Brilho-Dureza-Risca ou traço-Clivagem-Cor-Outras Propriedades
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Sedimentogénese
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Erosão
Transporte
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Meteorisação
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A Formação das Rochas Sedimentares implica duas fases principais:-A elaboração dos materiais que as vão constituir: Sedimentogénese-A evolução dos materiais até consolidarem numa rocha: Diagénese
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Sedimentogénese
Tipos de sedimentos:-Origem Detrítica
-Origem Química
-Origem Biogénica
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I- Nódulos de calcreteII- Pormenor do aspecto interior de um nódulo carbonatadoIII- Gesso nodular no seio de pelitos vermelhos (lapiseira e moeda como escalas).
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Erosão
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Legenda:1- Rolamento2- Saltação3- Suspensão4- Corrente
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Erosão – Conjunto de Processos de Transporte dos Sedimentos
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Meteorização Quimica
Granito
Calcite
Sal
Processos que alteram as rochas a nível químico.Certos minerais tomam formas diferentes ou mudam de composição
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Meteorização Física
Conjunto de processo que provocam a degradação física das rochas e dos sedimentos
Efeito da Temperatura:Crioclastia
Termoclastia
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Acção Mecânica da Água e do Vento
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Actividade Biologia
Esfoliação
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Processos que ocorrem na diagénese:
- Empacotamento mecânico- Precipitação de novos minerais (autigénicos)- Cimentação- Dissolução de minerais
Diagénese
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Fase 1 Fase 3Fase 2
Fase 4 Fase 5 Fase 6
Diagrama de Estratificação de Corais
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