Download - 1 class petro ignea
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Petrologia Ígnea
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Classificação das rochas ígneas
1. Composição química das rochas ígneas
2. Composição mineralógica (composição modal e norma CIPW)
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Classificação das rochas ígneas
1. Composição química das rochas ígneas
2. Composição mineralógica (composição modal e norma CIPW)
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Composição química; tipos de magmas (comuns)
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Que rochas são?
A B C D E
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Diagrama TAS (Total Álcalis vs Silica)
Usado para rochas vulcânicas
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Básicas Ácidas
Subsaturadas
SaturadasMáficas
Félsicas
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Exercício: Classificar as rochas B e D usando o Diagrama TAS
A B C D E
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B
C
D
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Classificação das rochas ígneas
1. Composição química das rochas ígneas
2. Composição mineralógica (composição modal e norma CIPW)
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plagioclaseanfíbola biotite
quartzo
ortose
2 m
m
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Plagioclase 40%
Quartzo 20%
Ortose 10%
Anfíbola 20%
Biotite 10%
Composição modal(% em volume)
Como classificar esta rocha?
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Sienitos ?Sienitos nefelínicosGranitos são todos iguais?
Classificação com base na composiçãomodal
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Classificação de Streckeisen
Rochas plutónicasMáficos < 90%
Q: quartzoP: plagioclaseA: feldspato alcalino (ortose e microclina)F: foid feldspatóide - nefelina
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A P
Q
%A
%P
%Q
Projectar apenas minerais félsicos (Q:P:A ou N:P:A): recalcular félsicos para 100%
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Composição modal
Plagioclase 45%
Quartzo 25%
Ortose 10%
Anfíbola 20%
Plg 45Qzo 25Ortose 10
80%
Plg: 45 80 x 100 x=(45x100)/80 =56.3%
Qzo: 25 80 y 100 y=(25x100)/80 =31.2 %
Ort: 10 80 z 100 z=(10x100)/80 =12.5 %
P:Q:A= 56.3 : 31.2 : 12.5Total félsicos
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P:Q:A= 56.3 : 31.2 : 12.5
Granodiorito
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plagioclaseanfíbola biotite
quartzo
ortose
2 m
m
Plagioclase 50%Anfíbola 40%Biotite 5%Quartzo 5%Outros vestigial
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Composição modal
Plagioclase 50%
Quartzo 5%
Ortose 0%
Anfíbola 40%
Biotite 5%
Plg 50Qzo 5Ortose -
55%
Plg: 50 55 x 100 x=(50x100)/55 =91%
Qzo: 5 55 y 100 y=(5x100)/55 =9 %
Ort: 0 55 z 100 z=(0x100)/55 =0 %
P:Q:A= 91 : 9 : 0
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P:Q:A= 91: 9 : 0
Diorito com quartzo?Gabro com quarzto?Anortosito com quartzo?
Dados adicionais:-Cor-Máficos-Plagioclase
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Classificação de Streckeisen
Rochas plutónicasMáficos > 90%
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E se a textura for muito fina?
1mm
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Classificação de Streckeinsen
Rochas vulcânicasMáficos < 90%
Q: quartzoP: plagioclaseA: feldspato alcalino (ortose e microclina)F: foid feldspatóide - nefelina