Ruta bascuas-magor-3-2012
Transcript of Ruta bascuas-magor-3-2012
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Bascuas-Magormarzo de 2012
Unha ruta para estudar xeoloxía en contacto coa natureza
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PUNTOS DE INTERESE1-Pregue de Bascuas
2-Furna3-Rego en fervenza
4-Dunas5-Rego
6-Praia fósil7-Tipos de rochas8-Filóns, diques,
incrustacións minerais...9-Furna
786
45
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9
á Lanzada e O Grove
a Sanxenxo
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PRAIA DE BASCUAS
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Pequeno pregue en neis e cuarcitas
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Pregue en rochas metamórficas (neis)
duns mil millóns de anos
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O pregue das rochas produce roturas e deformacións
marea baixa
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marea chea
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Rotura das rochas en forma escalonada ocasionada polo pregue
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Os diferente axentes, internos e externos,
danlle variadas formas ás rochas
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As rochas tamén adoptan diferentes texturas causadas polos axentes xeolóxicos
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Pregue roto, estratos verticais
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Diferentes tipos de rochas xuntos
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Rotura das rochas:
unha falla interrumpe o pregue
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A illa de Ons asomándose na parte final do pregue
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Erosión do mar sobre as rochas
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A parte final do pregue. No oco forma unha furna
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Erosión do mar sobre as rochas
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Pequenos granates entre o neis
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Sedimentos depositados sobre as rochas
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Os derrubes deixan á vista os sedimentos
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Ondulacións na area creadas pola baixada do mar
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PRAGUEIRA
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Remata o cantil. Comeza a praia
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Ao longo de miles de anos, o mar foi achegando materiais e creou a praia
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Rego doBesadoiro
Ao cambiar o nivel do mar o río desemboca en fervenza e crea un rego na praia
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MAGOR
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Dunas coa súa vexetación (no inverno)
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O vento transporta a area e crea dunas
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As dunas mantéñense grazas as plantas que viven nelas
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Son importantes , xa que son a reserva de area das praias.
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O Rego de Magor forma un pequeno canón na area
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Praia fósil que se formou cando baixou o nivel do mar
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Restos de cunchas nos sedimentos da praia fósil
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Arxilas
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Arenitas: os óxidos de ferro actúan de pegamento para as partículas
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Arenitas e comglomerados
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Erosión do mar sobre as rochas
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O traballo do mar na base do cantil forma unha rasa
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Praia de Espedregadas
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Numerosos seres vivos cubren as rochas do intermareal: algas, mexillóns, arneiróns, lapas...
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As rochas vense desgastadas pola acción do mar
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As infliltracións da auga nas fendas das rochas debilita os materiais e produce derrubes
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A erosión das zonas máis débiles produce furnas e ocos
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Liña estreita e alongada doutro mineral entre as rochas (filón de seixo)
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Filón de seixo. diferente resistencia dos tipos de materiais
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Placa de cuarcita sobre neis
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Pequenos filóns de seixo entrecruzados no neis
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Cristais de andalucita incrustados no neis
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Quiastolitas: macla de andalucitas en forma de cruz con incrustacións de carbono
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Texto: Tamara Parracho
Fotos:Alba Rodríguez
Carmen VilanovaCarmiña Salgueiro
Ana MuiñosMaría Díaz
Mirian TrigoWinona Ramos
Sandra González Xulián Múñiz
Ulises GonzálezRaúl PiñeiroJoel Mucelli
Emilio LumbresLaura Ozores
Tamara ParrachoIván Lois
Rocío VázquezAdela Leiro
2º ESO, marzo 2012