rochas sedimentares
TRANSCRIPT
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Rochas Sedimentares
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Ambientes tectônicose sedimentação
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Intemperismo físico e químico de rochas sedimentares, ígneas emetamórficas→ Erosão→ Transporte→ Deposição→ Diagênese e
litificação (compactação ) = Rochas Sedimentares
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• Os processos sedimentares atuam sobre rochas
ígneas, metamórficas e sedimentares preexistentescom a desagregação mecânica e química(intemperismo), erosão e transporte, deposição e
litificação de fragmentos (blocos, seixos) e partículas (areias, silte e argila) destas rochas emambientes sedimentares continentais, transicionais
e marinhos.
• Sedimentos: Material derivado de desagregaçãode rochas ígneas, metamórficas ou sedimentares(clásticas, químicas e biogênicas).
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Eólico
Glacial
FluvialMarinho
Ambientes
Continental
Marinho
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Ambientes sedimentares• São ambientes onde os sedimentos se
acumulam em depressões (baciassedimentares continentais e oceânicas).
• Cada ambiente sedimentar (fluvial, glacial,eólico e marinho raso e profundo) temcaracterísticas físicas, químicas e biológicas
e produtos sedimentares típicos
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Bacia sedimentar e sedimentação
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Ambientes Sedimentares Clásticos
ArgilaCorrentes oceânicasMar profundoArgila, areiaCorrentes oceânicasMargem continental
Areia, argilaOndas, maréPlataforma continental
MARINHO
Areia, argilaCorrentesPlanície de maré
Areia, cascalhoOndas, maréPraia
Areia, argilaRio + ondas + marésDelta
COSTEIRO
Areia, cascalho, argilaGeloGlacial
Areia, argilaCorrentes lacustres, ondasLacustre (lago)
Areia, silte,VentoEólico ou desérticoCascalho, areia, argilaRiosFluvial/Aluvional
CONTINENTAL
SEDIMENTOSAGENTE DE TRANSPORTE,DEPOSIÇÃO
AMBIENTE
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Agentes de Intemperismo, ErosãoTransporte e Deposição
• Água: processos sedimentares fluviais (rios e lagos), costeiro emarinho (marinho raso e profundo).
• Gelo: processos sedimentares glaciais causados por transporte de
sedimentos por geleiras.
• Vento: processos sedimentares eólicos causados por transporte
de sedimentos por vento em regiões continentais e marinhascosteiras.
• Gravidade (água e vento): fluxos de massas rochosas.
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Ação daágua
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Arenitos – Buraco do Padre – Ponta Grossa
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Arenito Furnas
Piraí do Sul
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Panelões - Guartelá
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Cálice em arenito Vila Velha - PR
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Ação domar
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Impacto das ondas – Marataízes - ES
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Impacto de demolição
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Ação do vento – transporte e deposição
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Ação do vento – dunas continentais
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Ação do vento – marcas de onda
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Ação do vento – dunas gigantes
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Ação do gelo
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Derretimento degeleiras – ação deágua e gelo
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Transporte de sedimentos
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Velocidade da sedimentação nos
ambientes sedimentares
• Gradual: taxa natural (dia-dia) desedimentação produzida por rios, ventos,mares e geleiras
• Episódica: taxas elevadas de sedimentação
que ocorre associada com enchentes emrios, avalanches de geleiras, tempestadesde areias...
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Diagênese e Litificação
Quando o sedimento setorna uma rocha
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• Diagênese: Conjunto de mudanças físicas,
químicas e biológicas, que afetam osedimento desde a deposição até a litificação
• Litificação: sedimentos inconsolidados sãolentamente convertidos em rochassedimentares ( ↓ P ↓ T)
• Processos associados com diagênese e
litificação:compactação, cimentação, recristalização ealteração química
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Classificação de Rochas Sedimentares
• Rochas Sedimentares Clásticas ou detríticas.
• Rochas Sedimentares Químicas
• Rochas Sedimentares Biogênicas
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• Sedimentos clásticos : R.S. Clásticas.
Conglomerados, arenitos, siltitos e argilitos.
• Sedimentos químicos : R.S. Químicas. Ex.
Gipsitos, Carbonatos (Calc. Cal. e Dol.), chert(sílex), BIF
• Sedimentos biogênicos : rochas de origem
biológica. Ex. carvão
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ROCHAS SEDIMENTARES CLÁSTICASSão classificadas pelo tamanho das partículas predominantes
• Conglomerados : os clastos maiores são de rochas (I. M.
S) preexistentes e a matriz é constituída por fragmentosminerais em tamanho de areia e silte. Brechasapresentam fragmentos angulares.
• Arenitos : predomina areia (quartzo) e podem ocorrerfeldspatos (arenitos feldspáticos).
• Siltitos : predomina quartzo e (feldspatos) no tamanhosilte.
• Argilitos e Folhelhos : argilominerais, quartzo, feldspatos
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Conglomerado
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Conglomerado
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Arenito
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Arenito rosa
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Arenito – Serra Capivara
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Arenito Vila Velha
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Argilito
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Argilito com gretas de contração e pegadas de dinossauro
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Folhelho
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Folhelho pirobetuminoso – São Mateus do Sul
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siltito
arenito
argilito
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Diamictito
Classificação dos sedimentos clásticosb l i
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com base na granulometria
Í
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ROCHAS SEDIMENTARES QUÍMICAS
• Litificação de precipitados químicosinorgânicos ou orgânicos
• Maioria contém um mineral importante,que é a base para sua classificação
• Carbonatos, Evaporitos, Formaçõesferríferas bandadas, depósitos fosfáticos,chert
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calcário
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Gruta Olhos d’água - PR
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Gruta Rei do Mato - MG
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Carbonato na Turquia
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Carbonato na Turquia
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Salar na Bolívia
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ROCHAS SEDIMENTARES BIOGÊNICAS
• litificação de sedimentos com alto teor dematéria orgânica.
• turfas (restos de vegetais), coquina(conchas de animais), carvão....
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carvão
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Extração de carvão - Figueira
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Mina Cambuí em Figueira
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Resumo rochas sedimentares
Carvão, turfa e coquinasBiológica
Sílex ou chert
Evaporitos
Calcítico (contém Ca)
Dolomítico (contém Ca e Mg)Calcários
Química
Folhelho/argilitoSiltito ArenitoConglomeradoClástica
Diminui a granulometriaOrigem
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Estruturas em rochas sedimentares
• Estratificação paralela• Estratificação gradacional
• Estratificação cruzada• Marcas de onda
• Gretas de contração
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Estratificação paralela
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ESTRATIFICAÇÃOGRADACIONAL
os grãos (partículas)maiores depositam-
se primeiro: seixos(conglomerados),areia (arenitos), silte(siltitos) e argila
(argilitos).
ESTRATIFICAÇÃO CRUZADA
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• Alternância de camadas horizontais e inclinadas.• Significado: Mudanças na direção do agente transportador(água, vento) dos sedimentos.
• Ex: arenitos eólicos e arenitos fluviais
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Marcasonduladas ou
Marcas deondas
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Gretas decontração
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Fósseis em
rochassedimentares